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
Hjemmeside

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Publikationer
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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