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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Publikationer
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Publikationer rss feed

2018
 

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

2017
  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

 

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

2016
 

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

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
 

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