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
 

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: Journal of Power Sources (ISSN: 0378-7753) (DOI: http://dx.doi.org/10.1016/j.jpowsour.2018.01.021), vol: 378, pages: 685-690, 2018

Type: Journal article (Peer reviewed)

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

2017
  PDF

Durable fuel electrode

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

Type: Patent

Status: Published     |    År: 2017

 

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

Boccaccini, Dino ; Sevecek, O. ; Frandsen, Henrik Lund ; Dlouhy, I. ; Molin, Sebastian ; Charlas, Benoit ; Hjelm, Johan ; Cannio, M. ; Hendriksen, Peter Vang
in journal: Journal of the European Ceramic Society (ISSN: 0955-2219) (DOI: http://dx.doi.org/10.1016/j.jeurceramsoc.2017.04.018), vol: 37, issue: 11, pages: 3565-3578, 2017

Type: Journal article (Peer reviewed)

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

  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: Electrochemical Society. Journal (ISSN: 0013-4651) (DOI: http://dx.doi.org/10.1149/2.1071709jes), vol: 164, issue: 9, pages: A2017-A2030, 2017

Type: Journal article (Peer reviewed)

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

  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, 2017, National Harbor, Washington, DC

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 journal: Electrochemical Society. Meeting Abstracts (Online) (ISSN: 2151-2043), vol: MA2017-02 , pages: 1, 2017
Presented at:
232nd ECS meeting, 2017, National Harbor, Washington, DC

Type: Conference abstract in journal (Peer reviewed)

Status: Published     |    År: 2017

  PDF

Electrochemical Characterization of a PEMEC Using Impedance Spectroscopy

Elsøe, Katrine ; Grahl-Madsen, L. ; Hjelm, Johan ; Scherer, G.G. ; Mogensen, Mogens Bjerg
in journal: Electrochemical Society. Journal (ISSN: 0013-4651) (DOI: http://dx.doi.org/10.1149/2.0651713jes), vol: 164, issue: 13, pages: F1419-F1426 , 2017

Type: Journal article (Peer reviewed)

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

 

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: Journal of Power Sources (ISSN: 0378-7753) (DOI: http://dx.doi.org/10.1016/j.jpowsour.2017.10.097), vol: 373, pages: 54-60, 2017

Type: Journal article (Peer reviewed)

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

 

Lifetime limiting effects in pre-commercial solid oxide cell devices

Skafte, Theis Løye ; Hjelm, Johan (Main supervisor) ; Graves, Christopher R. (Supervisor)
Department of Energy Conversion and Storage, Technical University of Denmark, pages: 142

Type: Ph.D. thesis

Status: Published     |    År: 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 (ISBN: 978-3-905592-22-1), 2017, European Fuel Cell Forum,
Presented at:
6th European PEFC and Electrolyser Forum 2017, 2017, Lucerne

Type: Article in proceedings (Peer reviewed)

Status: Published     |    År: 2017