Johan Hjelm

Johan Hjelm

Lektor

DTU ENERGI
Institut for Energikonvertering og -lagring

Danmarks Tekniske Universitet

Frederiksborgvej 399

Bygning 780, rum S03

4000 Roskilde

Tlf.
Tlf.
Mobil
Fax 46 77 58 58
E-mail johh@dtu.dk
ORCID 0000-0003-0072-5784
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2018
 

Complementary analyses of aging in a commercial LiFePO4/graphite 26650 cell

Scipioni, Roberto ; Jørgensen, Peter S. ; Stroe, Daniel I. ; Younesi, Reza ; Simonsen, Søren B. ; Norby, Poul ; Hjelm, Johan ; Jensen, Søren H.
in: Electrochimica Acta, vol: 284, pages: 454-468

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2018     |    DOI: https://doi.org/10.1016/j.electacta.2018.07.124

 

Electrochemical Characterization of a PEMEC Using Impedance Spectroscopy (vol 164, F1419, 2017)

Elsøe, Katrine ; Grahl-Madsen, L. ; Scherer, G. G. ; Hjelm, Johan ; Mogensen, Mogens Bjerg
in: Journal of the Electrochemical Society, vol: 165, issue: 10, pages: X9-X9

Type: Comment/debate

Status: Published     |    År: 2018     |    DOI: https://doi.org/10.1149/2.0501810jes

 

Electrochemical impedance of an alkaline organic flow battery

Hoffmeyer, Doris ; Hjelm, Johan
part of: Book of Conference Papers of the International Flow Battery Forum (IFBF 2018), 2018
Presented at:
International Flow Battery Forum (IFBF 2018)

Type: Article in proceedings (Peer reviewed)

Status: Published     |    År: 2018

  PDF

Noise Phenomena in Electrochemical Impedance Spectroscopy of Polymer Electrolyte Membrane Electrolysis Cells

Elsøe, K. ; Kraglund, M. R. ; Grahl-Madsen, L. ; Scherer, G. G. ; Hjelm, J. ; Jensen, S. H. ; Jacobsen, T. ; Mogensen, M. B.
in: Fuel Cells, vol: 18, issue: 5, pages: 640-648
Presented at:
6th European PEFC and Electrolyzer Forum

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2018     |    DOI: https://doi.org/10.1002/fuce.201800005

 

Reactivating the Ni-YSZ electrode in solid oxide cells and stacks by infiltration

Skafte, Theis Løye ; Hjelm, Johan ; Blennow Tullmar, Peter ; Graves, Christopher R.
in: Journal of Power Sources, vol: 378, pages: 685-690

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2018     |    DOI: https://doi.org/10.1016/j.jpowsour.2018.01.021

2017
  PDF

Durable fuel electrode

Brodersen, Karen ; Hauch, Anne ; Chen, Ming ; Hjelm, Johan
Patent no.: WO2017029350, Date: 2017-02-23

Type: Patent

Status: Published     |    År: 2017

  PDF

A Physically-Based Equivalent Circuit Model for the Impedance of a LiFePO4/Graphite 26650 Cylindrical Cell

Scipioni, Roberto ; Jørgensen, Peter Stanley ; Graves, Christopher R. ; Hjelm, Johan ; Jensen, Søren Højgaard
in: Journal of The Electrochemical Society, vol: 164, issue: 9, pages: A2017-A2030

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2017     |    DOI: https://doi.org/10.1149/2.1071709jes

 

Carbon deposition and sulfur poisoning during CO2 electrolysis in nickel-based solid oxide cell electrodes

Skafte, Theis Løye ; Blennow, Peter ; Hjelm, Johan ; Graves, Christopher R.
in: Journal of Power Sources, vol: 373, pages: 54-60

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2017     |    DOI: https://doi.org/10.1016/j.jpowsour.2017.10.097

  PDF

Challenges and Possibilities of EIS on PEMEC

Elsøe, Katrine ; Kraglund, Mikkel Rykær ; Hjelm, Johan ; Jacobsen, Torben ; Grahl-Madsen, Laila ; Mogensen, Mogens Bjerg
part of: Procedings of the 6th European PEFC and Electrolyser Forum 2017, 2017, European Fuel Cell Forum
Presented at:
6th European PEFC and Electrolyser Forum 2017

Type: Article in proceedings (Peer reviewed)

Status: Published     |    År: 2017

  PDF

Chemical and Electrochemical Properties of La0.58Sr0.4Fe0.8Co0.2O3-δ (LSCF) Thin Films upon Oxygen Reduction and Evolution Reactions

Pitscheider, Simon ; Machala, Michael ; Guan, Zixuan ; Chen, Di ; Hjelm, Johan ; Jacobsen, Torben ; Chueh, William C. ; Mogensen, Mogens Bjerg ; Chatzichristodoulou, Christodoulos
Presented at:
232nd ECS meeting

Type: Conference abstract for conference (Peer reviewed)

Status: Published     |    År: 2017

 

Chemical and Electrochemical Properties of La0.58Sr0.4Fe0.8Co0.2O3-δ (LSCF) Thin Films upon Oxygen Reduction and Evolution Reactions

Pitscheider, Simon ; Machala, Michael ; Guan, Zixuan ; Chen, Di ; Hjelm, Johan ; Jacobsen, Torben ; Chueh, William C. ; Mogensen, Mogens Bjerg ; Chatzichristodoulou, Christodoulos
in: Electrochemical Society. Meeting Abstracts (Online), vol: MA2017-02 , pages: 1
Presented at:
232nd ECS meeting

Type: Conference abstract in journal (Peer reviewed)

Status: Published     |    År: 2017

 

Determination of the bonding strength in solid oxide fuel cells' interfaces by Schwickerath crack initiation test

Boccaccini, D. N. ; Sevecek, O. ; Frandsen, Henrik Lund ; Dlouhy, I. ; Molin, Sebastian ; Charlas, Benoit ; Hjelm, Johan ; Cannio, M. ; Hendriksen, Peter Vang
in: Journal of the European Ceramic Society, vol: 37, issue: 11, pages: 3565-3578

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2017     |    DOI: https://doi.org/10.1016/j.jeurceramsoc.2017.04.018

  PDF

Electrochemical Characterization of a PEMEC Using Impedance Spectroscopy

Elsøe, Katrine ; Grahl-Madsen, L. ; Hjelm, Johan ; Scherer, G.G. ; Mogensen, Mogens Bjerg
in: Journal of The Electrochemical Society, vol: 164, issue: 13, pages: F1419-F1426

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2017     |    DOI: https://doi.org/10.1149/2.0651713jes

2016
 

An Ag based brazing system with a tunable thermal expansion for the use as sealant for solid oxide cells

Kiebach, Wolff-Ragnar ; Engelbrecht, Kurt ; Grahl-Madsen, Laila ; Sieborg, Bertil ; Chen, Ming ; Hjelm, Johan ; Norrman, Kion ; Chatzichristodoulou, Christodoulos ; Hendriksen, Peter Vang
in: Journal of Power Sources, vol: 315, pages: 339-350

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2016     |    DOI: https://doi.org/10.1016/j.jpowsour.2016.03.030

  PDF

An Electrochemical Impedance Spectroscopy Study on the Effects of the Surface- and Solution-Based Mechanisms in Li-O2Cells

Knudsen, Kristian Bastholm ; Vegge, Tejs ; McCloskey, Bryan D. ; Hjelm, Johan
in: Journal of the Electrochemical Society, vol: 163, issue: 9, pages: A2065-A2071

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2016     |    DOI: https://doi.org/10.1149/2.1111609jes

 

An Electrochemical Impedance Study of the Capacity Limitations in Na–O2 Cells

Knudsen, Kristian Bastholm ; Nichols, Jessica E. ; Vegge, Tejs ; Luntz, Alan C. ; McCloskey, Bryan D. ; Hjelm, Johan
in: The Journal of Physical Chemistry Part C, vol: 120, issue: 20, pages: 10799–10805

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2016     |    DOI: https://doi.org/10.1021/acs.jpcc.6b02788

 

Electrochemical Characterization of PEMECs Operating at Various Current Densities

Elsøe, Katrine ; G.-Madsen, Laila ; Scherer, Guenther G. ; Hjelm, Johan ; Mogensen, Mogens Bjerg
in: Electrochemical Society. Meeting Abstracts (Online), vol: MA2016-02, issue: 38
Presented at:
PRiME 2016/230th ECS Meeting

Type: Conference abstract in journal (Peer reviewed)

Status: Published     |    År: 2016

 

Electrochemical Impedance Spectroscopy on Industrially-Relevant Solid Oxide Electrolyzer Cell Stacks: A Powerful Tool for in-Situ Investigations of Degradation Mechanisms

Zielke, Philipp ; Høgh, Jens Valdemar Thorvald ; Chen, Ming ; Kiebach, Wolff-Ragnar ; Küngas, Rainer ; Blennow, Peter ; Hjelm, Johan ; Hendriksen, Peter Vang
in: Electrochemical Society. Meeting Abstracts (Online), vol: MA2016-02
Presented at:
PRiME 2016/230th ECS Meeting

Type: Conference abstract in journal (Peer reviewed)

Status: Published     |    År: 2016

  PDF

Electron microscopy investigations of changes in morphology and conductivity of LiFePO4/C electrodes

Scipioni, Roberto ; Jørgensen, Peter S. ; Ngo, Duc-The ; Simonsen, Søren Bredmose ; Liu, Zhao ; Yakal-Kremski, Kyle J. ; Wang, Hongqian ; Hjelm, Johan ; Norby, Poul ; Barnett, Scott A. ; Jensen, Søren Højgaard
in: Journal of Power Sources, vol: 307, pages: 259-269

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2016     |    DOI: https://doi.org/10.1016/j.jpowsour.2015.12.119

  PDF

Investigation of the bonding strength and bonding mechanisms of SOFCs interconnector-electrode interfaces

Boccaccini, Dino N. ; Sevecek, O. ; Frandsen, Henrik Lund ; Dlouhy, I. ; Molin, Sebastian ; Cannio, M. ; Hjelm, Johan ; Hendriksen, Peter Vang
in: Materials Letters, vol: 162, pages: 250–253

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2016     |    DOI: https://doi.org/10.1016/j.matlet.2015.07.137

  PDF

Kinetic Studies on State of the Art Solid Oxide Cells

Njodzefon, Jean-Claude ; Graves, Christopher R. ; Mogensen, Mogens Bjerg ; Weber, André ; Hjelm, Johan
in: Journal of The Electrochemical Society, vol: 163, issue: 13, pages: F1451-F1462

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2016     |    DOI: https://doi.org/10.1149/2.1201613jes

  PDF

Quantitative review of degradation and lifetime of solid oxide cells and stacks

Skafte, Theis Løye ; Hjelm, Johan ; Blennow, Peter ; Graves, Christopher R.
part of: Proceedings of 12th European SOFC & SOE Forum 2016, pages: 8-27, 2016, European Fuel Cell Forum
Presented at:
12th European SOFC & SOE Forum

Type: Article in proceedings (Peer reviewed)

Status: Published     |    År: 2016

2015
  PDF

Analysis of the Interphase on Carbon Black Formed in High Voltage Batteries

Younesi, Reza ; Christiansen, Ane Sælland ; Scipioni, Roberto ; Ngo, Duc-The ; Simonsen, Søren Bredmose ; Edström, Kristina ; Hjelm, Johan ; Norby, Poul
in: Journal of The Electrochemical Society, vol: 162, issue: 7, pages: A1289-A1296

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2015     |    DOI: https://doi.org/10.1149/2.0761507jes

  PDF

Analysis of the Interphase on Carbon Black Formed in High Voltage Batteries

Younesi, Reza ; Christiansen, Ane Sælland ; Scipioni, Roberto ; Ngo, Duc-The ; Simonsen, Søren Bredmose ; Edström, Kristina ; Hjelm, Johan ; Norby, Poul
Presented at:
Nordic Battery Conference 2015

Type: Conference abstract for conference (Peer reviewed)

Status: Published     |    År: 2015

 

An Electrochemical Impedance Spectroscopy Investigation of the Overpotentials in Li−O2 Batteries

Højberg, Jonathan ; McCloskey, Bryan D. ; Hjelm, Johan ; Vegge, Tejs ; Johansen, Keld ; Norby, Poul ; Luntz, Alan C.
in: A C S Applied Materials and Interfaces, vol: 7, issue: 7, pages: 4039−4047

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2015     |    DOI: https://doi.org/10.1021/am5083254

 

A Study of e- Transport through Li2O2, the Main Discharge Product in the Li-O2 Battery

Knudsen, Kristian Bastholm ; Jensen, Søren Højgaard ; Luntz, Alan C. ; Hjelm, Johan
in: Electrochemical Society. Meeting Abstracts (Online), vol: MA2015-01, issue: 2, pages: 20367-367

Type: Conference abstract in journal (Peer reviewed)

Status: Published     |    År: 2015

 

Carbon Deposition during CO2 Electrolysis in Ni-Based Solid-Oxide-Cell Electrodes

Skafte, Theis Løye ; Graves, Christopher R. ; Blennow, P. ; Hjelm, Johan
in: Electrochemical Society. Meeting Abstracts (Online), vol: MA2015-03, issue: 395

Type: Conference abstract in journal (Peer reviewed)

Status: Published     |    År: 2015

 

Carbon Deposition during CO2 Electrolysis in Ni-Based Solid-Oxide-Cell Electrodes

Skafte, Theis Løye ; Graves, Christopher R. ; Blennow, P. ; Hjelm, Johan
in: E C S Transactions, vol: 68, issue: 1, pages: 3429-3437
Presented at:
ECS Conference on Electrochemical Energy Conversion & Storage with SOFC–XIV

Type: Conference article (Peer reviewed)

Status: Published     |    År: 2015     |    DOI: https://doi.org/10.1149/06801.3429ecst

 

Degradation Studies on LiFePO4 cathode

Scipioni, Roberto ; Jørgensen, Peter Stanley ; Hjelm, Johan ; Norby, Poul ; Rasmussen, Claus Nygaard ; Jensen, Søren Højgaard
in: E C S Transactions, vol: 64, issue: 22, pages: 97-106
Presented at:
226th Meeting of the Electrochemical Society (ECS) and 7th Meeting of the Mexico Section of the Electrochemical Society ECS and SMEQ Joint International Meeting

Type: Conference article (Peer reviewed)

Status: Published     |    År: 2015     |    DOI: https://doi.org/10.1149/06422.0097ecst

  PDF

Electrochemical Impedance Spectroscopy as a Tool for PEMECs Development

Elsøe, Katrine ; Hjelm, Johan ; Mogensen, Mogens Bjerg
part of: Book of Abstracts. DTU's Sustain Conference 2015, 2015, Technical University of Denmark (DTU), Lyngby
Presented at:
DTU Sustain Conference 2015

Type: Conference abstract in proceedings (Peer reviewed)

Status: Published     |    År: 2015

  PDF

Electrode Kinetics and Gas Conversion in Solid Oxide Cells

Njodzefon, Jean-Claude ; Hjelm, Johan ; Graves, Christopher R. ; Weber, André (Supervisor)

Type: Ph.D. thesis

Status: Published     |    År: 2015

 

Enhancement of the chemical stability in confined δ-Bi2O3

Sanna, Simone ; Esposito, Vincenzo ; Andreasen, Jens Wenzel ; Hjelm, Johan ; Zhang, Wei ; Kasama, Takeshi ; Simonsen, Søren Bredmose ; Christensen, Mogens ; Linderoth, Søren ; Pryds, Nini
in: Nature Materials, vol: 14, issue: 5, pages: 500-504

Type: Letter (Peer reviewed)

Status: Published     |    År: 2015     |    DOI: https://doi.org/10.1038/nmat4266

 

Fabrication of thin yttria-stabilized-zirconia dense electrolyte layers by inkjet printing for high performing solid oxide fuel cells

Esposito, Vincenzo ; Gadea, Christophe ; Hjelm, Johan ; Marani, Debora ; Hu, Qiang ; Agersted, Karsten ; Ramousse, Severine ; Jensen, Søren Højgaard
in: Journal of Power Sources, vol: 273, pages: 89-95

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2015     |    DOI: https://doi.org/10.1016/j.jpowsour.2014.09.085

 

Influence of hydroxyl content of binders on rheological properties of cerium-gadolinium oxide (CGO) screen printing inks

Marani, Debora ; Gadea, Christophe ; Hjelm, Johan ; Hjalmarsson, Per ; Wandel, Marie ; Kiebach, Wolff-Ragnar
in: Journal of the European Ceramic Society, vol: 35, issue: 5, pages: 1495–1504

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2015     |    DOI: https://doi.org/10.1016/j.jeurceramsoc.2014.11.025

 

Kinetic Studies on Ni-YSZ Composite Electrodes

Njodzefon, Jean-Claude ; Hjelm, Johan ; Graves, Christopher R. ; Sudireddy, Bhaskar Reddy
in: Electrochemical Society. Meeting Abstracts (Online), vol: MA2015-03, issue: 1

Type: Conference abstract in journal (Peer reviewed)

Status: Published     |    År: 2015

 

Kinetic Studies on Ni-YSZ Composite Electrodes

Njodzefon, Jean-Claude ; Sudireddy, Bhaskar Reddy ; Hjelm, Johan ; Graves, Christopher R.
in: ECS Transactions, vol: 68, issue: 1, pages: 1169-1184
Presented at:
ECS Conference on Electrochemical Energy Conversion & Storage with SOFC–XIV

Type: Conference article (Peer reviewed)

Status: Published     |    År: 2015     |    DOI: https://doi.org/10.1149/06801.1169ecst

 

Kinetic Studies on State of the Art Solid Oxide Cells – A Comparison between Hydrogen/Steam and Reformate Fuels

Njodzefon, Jean-Claude ; Graves, Christopher R. ; Mogensen, Mogens Bjerg ; Weber, André ; Hjelm, Johan
in: E C S Transactions, vol: 64, issue: 18, pages: 51-65
Presented at:
226th Meeting of the Electrochemical Society (ECS) and 7th Meeting of the Mexico Section of the Electrochemical Society ECS and SMEQ Joint International Meeting

Type: Conference article (Peer reviewed)

Status: Published     |    År: 2015     |    DOI: https://doi.org/10.1149/06418.0051ecst

 

Low - voltage FIB/SEM Tomography for 3D Microstructure Evolution of LiFePO4/C Electrode

Scipioni, Roberto ; Jørgensen, Peter Stanley ; Ngo, Duc-The ; Simonsen, Søren Bredmose ; Hjelm, Johan ; Norby, Poul ; Jensen, Søren Højgaard
in: Electrochemical Society. Meeting Abstracts (Online), vol: MA2015-02, issue: 1, pages: 42
Presented at:
The 228th ECS Meeting

Type: Conference abstract in journal (Peer reviewed)

Status: Published     |    År: 2015

  PDF

Low-voltage FIB/SEM Tomography for 3D Microstructure Evolution of LiFePO4/C Electrode

Scipioni, Roberto ; Jørgensen, Peter Stanley ; Ngo, Duc-The ; Simonsen, Søren Bredmose ; Hjelm, Johan ; Norby, Poul ; Jensen, Søren Højgaard
in: E C S Transactions, vol: 69, issue: 18, pages: 71-80
Presented at:
The 228th ECS Meeting

Type: Conference article (Peer reviewed)

Status: Published     |    År: 2015     |    DOI: https://doi.org/10.1149/06918.0071ecst

 

Reactions and SEI Formation during Charging of Li-O2 Cells

Højberg, Jonathan ; Knudsen, Kristian Bastholm ; Hjelm, Johan ; Vegge, Tejs
in: E C S Electrochemistry Letters, vol: 4, issue: 7, pages: A63-A66

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2015     |    DOI: https://doi.org/10.1149/2.0051507eel

  PDF

Redox Probing Study of the Potential Dependence of Charge Transport Through Li2O2

Knudsen, Kristian Bastholm ; Luntz, Alan C. ; Jensen, Søren Højgaard ; Vegge, Tejs ; Hjelm, Johan
in: The Journal of Physical Chemistry Part C, vol: 119, issue: 51, pages: 28292–28299

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2015     |    DOI: https://doi.org/10.1021/acs.jpcc.5b08757

  PDF

SOFC brændselsceller i et intelligent elnet

Hjelm, Johan
in: FIB - Forskning i Bioenergi, Brint & Brændselsceller, vol: 12, issue: 52, pages: 27-27

Type: Journal article

Status: Published     |    År: 2015

 

Sulfur Poisoning of Ni/stabilized-zirconia Anodes

Hauch, Anne ; Hagen, Anke ; Hjelm, Johan ; Ramos, Tania
Presented at:
13th International Symposium on Solid Oxide Fuel Cells (SOFC-XIII)

Type: Sound/Visual production (digital)

Status: Published     |    År: 2015

2014
 

Advanced impedance modeling of solid oxide electrochemical cells

Graves, Christopher R. ; Hjelm, Johan
part of: Proceedings of 11th European SOFC and SOE Forum 2014, 2014, European Fuel Cell Forum
Presented at:
European fuel cell 2014 - 11th European SOFC and SOE Forum 2014

Type: Article in proceedings (Peer reviewed)

Status: Published     |    År: 2014

  PDF

Degradation Studies on LiFePO4 cathode

Scipioni, Roberto ; Jørgensen, Peter Stanley ; Hjelm, Johan ; Norby, Poul ; Rasmussen, Claus Nygaard ; Jensen, Søren Højgaard
in: Electrochemical Society. Meeting Abstracts (Online), vol: MA2014-02, issue: 5, pages: 382
Presented at:
226th Meeting of the Electrochemical Society (ECS) and 7th Meeting of the Mexico Section of the Electrochemical Society ECS and SMEQ Joint International Meeting

Type: Conference abstract in journal (Peer reviewed)

Status: Published     |    År: 2014

 

Fuel flow distribution in SOFC stacks revealed by impedance spectroscopy

Mosbæk, Rasmus Rode ; Hjelm, Johan ; Barfod, Rasmus ; Hendriksen, Peter Vang
part of: Proceedings of 11th European SOFC and SOE Forum 2014, 2014, European Fuel Cell Forum
Presented at:
European fuel cell 2014 - 11th European SOFC and SOE Forum 2014

Type: Article in proceedings (Peer reviewed)

Status: Published     |    År: 2014

  PDF

Impedance of SOFC electrodes: A review and a comprehensive case study on the impedance of LSM:YSZ cathodes

Nielsen, Jimmi ; Hjelm, Johan
in: Electrochimica Acta, vol: 115, pages: 31-45

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2014     |    DOI: https://doi.org/10.1016/j.electacta.2013.10.053

  PDF

Impedance perspectives on Li-air battery overpotentials

Højberg, Jonathan ; McCloskey, Bryan D. ; Luntz, Alan C. ; Hjelm, Johan ; Johansen, Keld ; Norby, Poul ; Vegge, Tejs
Presented at:
Nordisk Batterikonferens 2013 (NORDBATT)

Type: Conference abstract for conference (Peer reviewed)

Status: Published     |    År: 2014

  PDF

Kinetic Studies on State of the Art Solid Oxide Cells

Njodzefon, Jean-Claude ; Graves, Christopher R. ; Hjelm, Johan ; Mogensen, Mogens Bjerg ; Weber, André
in: Electrochemical Society. Meeting Abstracts (Online), vol: MA2014-02
Presented at:
226th Meeting of the Electrochemical Society (ECS) and 7th Meeting of the Mexico Section of the Electrochemical Society ECS and SMEQ Joint International Meeting

Type: Conference abstract in journal (Peer reviewed)

Status: Published     |    År: 2014

 

Rheological analysis of stabilized cerium-gadolinium oxide (CGO) dispersions

Marani, Debora ; Hjelm, Johan ; Wandel, Marie
in: Journal of the European Ceramic Society, vol: 34, issue: 3, pages: 695–702

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2014     |    DOI: https://doi.org/10.1016/j.jeurceramsoc.2013.09.022

  PDF

Solid Oxide Fuel Cell Stack Diagnostics

Mosbæk, Rasmus Rode ; Hjelm, Johan ; Hendriksen, Peter Vang ; Barfod, Rasmus Gottrup

Type: Ph.D. thesis

Status: Published     |    År: 2014

 

Structural instability and electrical properties in epitaxial Er2O3-stabilized Bi2O3 thin films

Sanna, Simone ; Esposito, Vincenzo ; Graves, Christopher R. ; Hjelm, Johan ; Andreasen, Jens Wenzel ; Pryds, Nini
in: Solid State Ionics, vol: 266, pages: 13-18

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2014     |    DOI: https://doi.org/10.1016/j.ssi.2014.08.004

  PDF

Sulfur Poisoning of SOFC Anodes: Effect of Overpotential on Long-Term Degradation

Hauch, Anne ; Hagen, Anke ; Hjelm, Johan ; Ramos, Tania
in: Journal of The Electrochemical Society, vol: 161, issue: 6, pages: F734-F743

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2014     |    DOI: https://doi.org/10.1149/2.080406jes

2013
 

Durability and Performance of High Performance Infiltration Cathodes

Samson, Alfred Junio ; Søgaard, Martin ; Hjalmarsson, Per ; Hjelm, Johan ; Bonanos, Nikolaos ; Foghmoes, Søren Preben Vagn ; Ramos, Tania
in: Fuel Cells, vol: 13, issue: 4, pages: 511-519
Presented at:
10th European SOFC Forum

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2013     |    DOI: https://doi.org/10.1002/fuce.201200183

 

Electrochemical Characterization and Degradation Analysis of Large SOFC Stacks by Impedance Spectroscopy

Mosbæk, Rasmus Rode ; Hjelm, Johan ; Barfod, R. ; Høgh, Jens Valdemar Thorvald ; Hendriksen, Peter Vang
in: Fuel Cells, vol: 13, issue: 4, pages: 605-611
Presented at:
10th European SOFC Forum

Type: Conference article (Peer reviewed)

Status: Published     |    År: 2013     |    DOI: https://doi.org/10.1002/fuce.201200175

 

Investigation of novel solid oxide fuel cell cathodes based on impregnation of SrTixFe1-xO3-δ into ceria-based backbones

Brinch-Larsen, Mathias ; Søgaard, Martin ; Hjelm, Johan ; Frandsen, Henrik Lund
part of: Advances in Solid Oxide Fuel Cells VIII - 36th International Conference on Advanced Ceramics and Composites, ICACC 2012, pages: 1-12, 2013, American Ceramic Society
Presented at:
36th International Conference on Advanced Ceramics and Composites

Type: Article in proceedings (Peer reviewed)

Status: Published     |    År: 2013

 

Rheology of stabilized cerium-gadolinium oxide (CGO) colloidal system

Marani, Debora ; Hjelm, Johan ; Wandel, Marie
Presented at:
8th Annual European Rheology Conference

Type: Conference abstract for conference (Peer reviewed)

Status: Published     |    År: 2013

 

Sulfur Poisoning of Ni/stabilized-zirconia Anodes – Effect on Long-Term Durability

Hauch, Anne ; Hagen, Anke ; Hjelm, Johan ; Ramos, Tania
in: E C S Transactions, vol: 57, issue: 1, pages: 615-625
Presented at:
13th International Symposium on Solid Oxide Fuel Cells (SOFC-XIII)

Type: Conference article (Peer reviewed)

Status: Published     |    År: 2013     |    DOI: https://doi.org/10.1149/05701.0615ecst

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Three-dimensional Nanofiber Cathode for Low Temperature and High Temperature Fuel Cells

Zhang, Wenjing (Angela) ; Zhang, Wei ; Simonsen, Søren ; Esposito, Vincenzo ; Hjelm, Johan ; Ramousse, Severine ; Jensen, Jens Oluf ; Shao, Jing
Presented at:
Annual meeting of the Danish Electrochemical Society

Type: Conference abstract for conference

Status: Published     |    År: 2013

 

Use of Intrinsic Viscosity for evaluation of polymer-solvent affinity

Marani, Debora ; Hjelm, Johan ; Wandel, Marie
in: Nordic Rheology Society Annual Transactions, vol: 21
Presented at:
22nd Nordic Rheology Conference

Type: Conference article (Peer reviewed)

Status: Published     |    År: 2013

2012
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Detailed Electrochemical Characterisation of Large SOFC Stacks

Mosbæk, Rasmus Rode ; Hjelm, Johan ; Barfod, R. ; Høgh, Jens Valdemar Thorvald ; Hendriksen, Peter Vang
part of: Proceedings of 10th European SOFC Forum, pages: 56/203-65/203, 2012
Presented at:
10th European SOFC Forum

Type: Article in proceedings (Peer reviewed)

Status: Published     |    År: 2012

 

Electrochemical Switching of Conductance with Diarylethene-Based Redox-Active Polymers

Logtenberg, Hella ; van der Velde, Jasper H. M. ; de Mendoza, Paula ; Areephong, Jetsuda ; Hjelm, Johan ; Feringa, Ben L. ; Browne, Wesley R.
in: The Journal of Physical Chemistry Part C, vol: 116, pages: 24136−24142

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2012     |    DOI: https://doi.org/10.1021/jp307892s

 

Highly durable anode supported solid oxide fuel cell with an infiltrated cathode

Samson, Alfred Junio ; Hjalmarsson, Per ; Søgaard, Martin ; Hjelm, Johan ; Bonanos, Nikolaos
in: Journal of Power Sources, vol: 216, pages: 124-130

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2012     |    DOI: https://doi.org/10.1016/j.jpowsour.2012.05.040

2011
 

A high performance ceria based interdiffusion barrier layer prepared by spin-coating

Plonczak, Pawel ; Joost, Mario ; Hjelm, Johan ; Søgaard, Martin ; Lundberg, Mats ; Hendriksen, Peter Vang
in: Journal of Power Sources, vol: 196, issue: 3, pages: 1156-1162

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2011     |    DOI: https://doi.org/10.1016/j.jpowsour.2010.08.108

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Determination of overpotential characteristics of reversible solid oxide cells via impedance spectroscopy and correlation with cell degradation

Graves, Christopher R. ; Ebbesen, Sune Dalgaard ; Hjelm, Johan
part of: Proceedings, 2011
Presented at:
220th ECS Meeting

Type: Conference abstract in proceedings (Peer reviewed)

Status: Published     |    År: 2011

 

Development of Long-Term Stable and High-Performing Metal-Supported SOFCs

Klemensø, Trine ; Nielsen, Jimmi ; Blennow Tullmar, Peter ; Persson, Åsa Helen ; Stegk, Tobias ; Hjalmarsson, Per ; Christensen, Bjarke ; Sønderby, Steffen ; Hjelm, Johan ; Ramousse, Severine
in: E C S Transactions, vol: 35, issue: 1, pages: 369-378
Presented at:
12th International Symposium on Solid Oxide Fuel Cells, 219th ECS Meeting

Type: Conference article (Peer reviewed)

Status: Published     |    År: 2011     |    DOI: https://doi.org/10.1149/1.3570011

 

Durability of Solid Oxide Cells

Knibbe, Ruth ; Hauch, Anne ; Hjelm, Johan ; Ebbesen, Sune Dalgaard ; Mogensen, Mogens Bjerg
in: Green, vol: 16, issue: 2, pages: 141-169

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2011     |    DOI: https://doi.org/10.1515/GREEN.2011.015

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High performance anode supported SOFC produced by multilayer tape casting

Brodersen, Karen ; Hauch, Anne ; Hjalmarsson, Per ; Hjelm, Johan
Presented at:
12th Conference of the European Ceramic Society

Type: Conference abstract for conference

Status: Published     |    År: 2011

 

Manufacturing and characterization of metal-supported solid oxide fuel cells

Blennow Tullmar, Peter ; Hjelm, Johan ; Klemensø, Trine ; Ramousse, Severine ; Kromp, Alexander ; Leonide, André ; Weber, André
in: Journal of Power Sources, vol: 196, issue: 17, pages: 7117-7125
Presented at:
9th European Solid Oxide Fuel Cell Forum

Type: Conference article (Peer reviewed)

Status: Published     |    År: 2011     |    DOI: https://doi.org/10.1016/j.jpowsour.2010.08.088

 

Planar metal-supported SOFC with novel cermet anode

Blennow Tullmar, Peter ; Hjelm, Johan ; Klemensø, Trine ; Persson, Åsa Helen ; Ramousse, Severine ; Mogensen, Mogens Bjerg
in: Fuel Cells, vol: 11, issue: 5, pages: 661-668

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2011     |    DOI: https://doi.org/10.1002/fuce.201100029

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Technological implementation of LSC40 as porous cathode in SOFCs

Hjalmarsson, Per ; Mosbæk, Rasmus Rode ; Hjelm, Johan
Presented at:
European Ceramic Society Conference

Type: Poster

Status: Published     |    År: 2011

 

Towards Quantification of Relations Between Electrode Polarisation and Microstructure

Ramos, Tania ; Hjelm, Johan ; Mogensen, Mogens Bjerg
in: Journal of The Electrochemical Society, vol: 158, issue: 7, pages: B814-B824

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2011     |    DOI: https://doi.org/10.1149/1.3587113

2010
 

Cathode-Electrolyte Interfaces with CGO Barrier Layers in SOFC

Knibbe, Ruth ; Hjelm, Johan ; Menon, Mohan ; Pryds, Nini ; Søgaard, Martin ; Wang, Hsiang-Jen ; Neufeld, Kai
in: Journal of the American Ceramic Society, vol: 93, issue: 9, pages: 2877-2883

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2010     |    DOI: https://doi.org/10.1111/j.1551-2916.2010.03763.x

2009
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Comparison of the Degradation of the Polarisation Resistance of Symmetrical LSM-YSZ cells, with Anode Supported Ni-YSZ/YSZ/LSM-YSZ SOFCs

Torres da Silva, Iris Maura ; Nielsen, Jimmi ; Hjelm, Johan ; Mogensen, Mogens Bjerg
in: E C S Transactions, vol: 25, issue: 2, pages: 489-498
Presented at:
216th ECS Meeting

Type: Conference article (Peer reviewed)

Status: Published     |    År: 2009     |    DOI: https://doi.org/10.1149/1.3205559

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Comparison of the Degradation of the Polarization Resistance of Symmetrical LSM-YSZ Cells, with Anode Supported Ni-YSZ/YSZ/LSM-YSZ SOFCs

Torres da Silva, Iris Maura ; Nielsen, Jimmi ; Hjelm, Johan ; Mogensen, Mogens Bjerg
part of: Meeting Abstracts - Electrochemical Society, pages: Abstract 1508, 2009, The Electrochemical Society
Presented at:
216th ECS Meeting

Type: Conference abstract in proceedings (Peer reviewed)

Status: Published     |    År: 2009

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Development of Planar Metal Supported SOFC with Novel Cermet Anode

Blennow Tullmar, Peter ; Hjelm, Johan ; Klemensø, Trine ; Persson, Åsa Helen ; Brodersen, Karen ; Srivastava, Akhilesh Kumar ; Frandsen, Henrik Lund ; Lundberg, Mats ; Ramousse, Severine ; Mogensen, Mogens Bjerg
part of: Meeting Abstracts - Electrochemical Society, pages: Abstract 1441, 2009, The Electrochemical Society
Presented at:
216th ECS Meeting

Type: Conference abstract in proceedings (Peer reviewed)

Status: Published     |    År: 2009

  PDF

Development of Planar Metal Supported SOFC with Novel Cermet Anode

Blennow Tullmar, Peter ; Hjelm, Johan ; Klemensø, Trine ; Persson, Åsa Helen ; Brodersen, Karen ; Srivastava, Akhilesh Kumar ; Frandsen, Henrik Lund ; Lundberg, Mats ; Ramousse, Severine ; Mogensen, Mogens Bjerg
in: E C S Transactions, vol: 25, issue: 2, pages: 701-710
Presented at:
216th ECS Meeting

Type: Conference article (Peer reviewed)

Status: Published     |    År: 2009     |    DOI: https://doi.org/10.1149/1.3205585

 

Electrochemical impedance spectroscopy as diagnostic tool

Jensen, Søren Højgaard ; Hjelm, Johan ; Hagen, Anke ; Mogensen, Mogens Bjerg
part of: Handbook of Fuel Cells – Fundamentals, Technology and Applications, 2009, Wiley

Type: Book chapter (Peer reviewed)

Status: Published     |    År: 2009

2008
 

Electro- and photochemical switching of dithienylethene self-assembled monolayers on gold electrodes

Browne, W.R. ; Kudernac, T. ; Katsonis, N. ; Areephong, J. ; Hjelm, Johan ; Feringa, B.L.
in: Journal of Physical Chemistry C, vol: 112, issue: 4, pages: 1183-1190

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2008     |    DOI: https://doi.org/10.1021/jp0766508

 

Electrochemical Characterization of Planar Anode Supported SOFC with Strontium-Doped Lanthanum Cobalt Oxide Cathodes

Hjelm, Johan ; Søgaard, Martin ; Knibbe, Ruth ; Hagen, Anke ; Mogensen, Mogens Bjerg
in: ECS Transactions, vol: 13, issue: 26, pages: 285-299
Presented at:
213th ECS Meeting

Type: Conference article (Peer reviewed)

Status: Published     |    År: 2008     |    DOI: https://doi.org/10.1149/1.3050400

 

On/Off Photoswitching of the Electropolymerizability of Terthiophenes

Areephong, Jetsuda ; Kudernac, Tibor ; de Jong, Jaap J.D. ; Carroll, Gregory T. ; Pantorott, Davide ; Hjelm, Johan ; Browne, Wesley R. ; Feringa, Ben L.
in: Journal of the American Chemical Society, vol: 130, issue: 39, pages: 12850-12851

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2008     |    DOI: https://doi.org/10.1021/ja803714p

 

ORGN 495 - From solutions to surfaces: Exploring the effect of surface confinement on molecular photochemistry and conformational behavior

Browne, Wesley R. ; Areephong, Jetsuda ; Katsonis, Nathalie ; Hjelm, Johan ; Feringa, Ben L.
part of: Abstracts of Papers of the American Chemical Society, pages: 495-ORGN, 2008, American Chemical Society
Presented at:
235th National Meeting of the American Chemical Society

Type: Conference abstract in proceedings

Status: Published     |    År: 2008

 

Performance and Electrochemical Characterisation of Thin Electrolyte SOFCs

Ramos, Tania ; Hjelm, Johan ; Wandel, Marie Emilie ; Hagen, Anke ; Mogensen, Mogens Bjerg
in: ECS Transactions, vol: 13, issue: 26, pages: 235-248
Presented at:
213th ECS Meeting

Type: Conference article (Peer reviewed)

Status: Published     |    År: 2008     |    DOI: https://doi.org/10.1149/1.3050396

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Performance and Electrochemical Characterisation of Thin Electrolyte SOFCs

Ramos, Tania ; Hjelm, Johan ; Wandel, Marie ; Hagen, Anke ; Mogensen, Mogens Bjerg
part of: Meeting Abstracts - Electrochemical Society, pages: Abstract 377, 2008, The Electrochemical Society
Presented at:
213th ECS Meeting

Type: Conference abstract in proceedings (Peer reviewed)

Status: Published     |    År: 2008

 

Photochromism and electrochemistry of a dithienylcyclopentene electroactive polymer

Wesenhagen, P. ; Areephong, J. ; Landaluce, T.F. ; Heureux, N. ; Katsonis, N. ; Hjelm, Johan ; Rudolf, P. ; Browne, W.R. ; Feringa, B.L.
in: Langmuir, vol: 24, issue: 12, pages: 6334-6342

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2008     |    DOI: https://doi.org/10.1021/la703999x

 

SOFC research and development at Risø DTU

Menon, Mohan ; Hjelm, Johan
Presented at:
9. International symposium on ceramic materials and components for energy and environmental applications - 2008CMCEE

Type: Paper

Status: Published     |    År: 2008

2007
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Electrochemical Impedance Studies of SOFC Cathodes

Hjelm, Johan ; Søgaard, Martin ; Wandel, Marie ; Mogensen, Mogens Bjerg ; Menon, Mohan ; Hagen, Anke
in: E C S Transactions, vol: 7, issue: 1, pages: 1261-1270
Presented at:
10th International symposium on solid oxide fuel cells

Type: Conference article (Peer reviewed)

Status: Published     |    År: 2007     |    DOI: https://doi.org/10.1149/1.2729227

 

Synthesis and characterization of dinuclear ruthenium(II) complexes based on 4,4'-bipyridyl type gridging ligands

Guckian, A.L. ; Browne, W.R. ; Hjelm, Johan ; Vos, J.G.
in: Journal of the Chinese Chemical Society, vol: 54, pages: 1151-1161

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2007