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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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

  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

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

 

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