Johan Hjelm

Johan Hjelm

Professor

DTU ENERGI
Institut for Energikonvertering og -lagring

Danmarks Tekniske Universitet

Fysikvej

Bygning 310, rum 320

2800 Kgs. Lyngby

Hjemmeside

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Publikationer
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2020
 

Molecular Engineering Strategies for Symmetric Aqueous Organic Redox Flow Batteries

Fornari, Rocco Peter ; Mesta, Murat ; Hjelm, Johan ; Vegge, Tejs ; de Silva, Piotr
in: ACS Materials Letters , vol: 2, issue: 3, pages: 239-246

Type: Letter (Peer reviewed)

Status: Published     |    År: 2020     |    DOI: https://doi.org/10.1021/acsmaterialslett.0c00028

 

Proton-coupled electron transfer from an interfacial phenol monolayer

Sjödin, Martin ; Hjelm, Johan ; Rutherford, A. William ; Forster, Robert
in: Journal of Electroanalytical Chemistry, vol: 859

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2020     |    DOI: https://doi.org/10.1016/j.jelechem.2020.113856

2018
  PDF

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

  PDF

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
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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

  PDF

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