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
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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

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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: 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

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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

2016
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Investigation of the bonding strength and bonding mechanisms of SOFCs interconnector-electrode interfaces

Boccaccini, Dino ; Sevecek, O. ; Frandsen, Henrik Lund ; Dlouhy, I. ; Molin, Sebastian ; Cannio, M. ; Hjelm, Johan ; Hendriksen, Peter Vang
in journal: Materials Letters (ISSN: 0167-577X) (DOI: http://dx.doi.org/10.1016/j.matlet.2015.07.137), vol: 162, pages: 250–253, 2016

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2016     |    DOI: http://dx.doi.org/10.1016/j.matlet.2015.07.137

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Electron microscopy investigations of changes in morphology and conductivity of LiFePO4/C electrodes

Scipioni, Roberto ; Jørgensen, Peter Stanley ; Ngo, Duc-The ; Simonsen, Søren Bredmose ; Liu, Zhao ; Yakal-Kremski, Kyle J. ; Wang, Hongqian ; Hjelm, Johan ; Norby, Poul ; Barnett, Scott ; Jensen, Søren Højgaard
in journal: Journal of Power Sources (ISSN: 0378-7753) (DOI: http://dx.doi.org/10.1016/j.jpowsour.2015.12.119), vol: 307, pages: 259-269, 2016

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2016     |    DOI: http://dx.doi.org/10.1016/j.jpowsour.2015.12.119

 

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: Journal of Power Sources (ISSN: 0378-7753) (DOI: http://dx.doi.org/10.1016/j.jpowsour.2016.03.030), vol: 315, pages: 339-350, 2016

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2016     |    DOI: http://dx.doi.org/10.1016/j.jpowsour.2016.03.030

 

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 journal: The Journal of Physical Chemistry Part C: Nanomaterials, Interfaces and Hard Matter (ISSN: 1932-7447) (DOI: http://dx.doi.org/10.1021/acs.jpcc.6b02788), vol: 120, issue: 20, pages: 10799–10805, 2016

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2016     |    DOI: http://dx.doi.org/10.1021/acs.jpcc.6b02788

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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: Journal of the Electrochemical Society (ISSN: 0013-4651) (DOI: http://dx.doi.org/10.1149/2.1111609jes), vol: 163, issue: 9, pages: A2065-A2071, 2016

Type: Journal article (Peer reviewed)

Status: Published     |    År: 2016     |    DOI: http://dx.doi.org/10.1149/2.1111609jes