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Research Output

2020

Molecular Engineering Strategies for Symmetric Aqueous Organic Redox Flow Batteries

Fornari, R. P., Mesta, M., Hjelm, J., Vegge, T. & de Silva, P., 2020, In : ACS Materials Letters . 2, 3, p. 239-246

Research output: Contribution to journalLetterResearchpeer-review

Proton-coupled electron transfer from an interfacial phenol monolayer

Sjödin, M., Hjelm, J., Rutherford, A. W. & Forster, R., 2020, In : Journal of Electroanalytical Chemistry. 859, 8 p., 113856.

Research output: Contribution to journalJournal articleResearchpeer-review

2018

Complementary analyses of aging in a commercial LiFePO4/graphite 26650 cell

Scipioni, R., Jørgensen, P. S., Stroe, D. I., Younesi, R., Simonsen, S. B., Norby, P., Hjelm, J. & Jensen, S. H., 10 Sep 2018, In : Electrochimica Acta. 284, p. 454-468

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
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3 Downloads (Pure)

Electrochemical Characterization of a PEMEC Using Impedance Spectroscopy (vol 164, F1419, 2017)

Elsøe, K., Grahl-Madsen, L., Scherer, G. G., Hjelm, J. & Mogensen, M. B., 2018, In : Journal of the Electrochemical Society. 165, 10, p. X9-X9

Research output: Contribution to journalComment/debateCommunication

Electrochemical impedance of an alkaline organic flow battery

Hoffmeyer, D. & Hjelm, J., 2018, Book of Conference Papers of the International Flow Battery Forum (IFBF 2018). 3 p.

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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., 2018, In : Fuel Cells. 18, 5, p. 640-648

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
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306 Downloads (Pure)

Reactivating the Ni-YSZ electrode in solid oxide cells and stacks by infiltration

Skafte, T. L., Hjelm, J., Blennow Tullmar, P. & Graves, C. R., 2018, In : Journal of Power Sources. 378, p. 685-690

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
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86 Downloads (Pure)
2017

A Physically-Based Equivalent Circuit Model for the Impedance of a LiFePO4/Graphite 26650 Cylindrical Cell

Scipioni, R., Jørgensen, P. S., Graves, C. R., Hjelm, J. & Jensen, S. H., 2017, In : Journal of The Electrochemical Society. 164, 9, p. A2017-A2030

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
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1642 Downloads (Pure)

Carbon deposition and sulfur poisoning during CO2 electrolysis in nickel-based solid oxide cell electrodes

Skafte, T. L., Blennow, P., Hjelm, J. & Graves, C. R., 2017, In : Journal of Power Sources. 373, p. 54-60

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
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149 Downloads (Pure)

Challenges and Possibilities of EIS on PEMEC

Elsøe, K., Kraglund, M. R., Hjelm, J., Jacobsen, T., Grahl-Madsen, L. & Mogensen, M. B., 2017, Procedings of the 6th European PEFC and Electrolyser Forum 2017. European Fuel Cell Forum, 7 p. A1002

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Open Access
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194 Downloads (Pure)

Chemical and Electrochemical Properties of La0.58Sr0.4Fe0.8Co0.2O3-δ (LSCF) Thin Films upon Oxygen Reduction and Evolution Reactions

Pitscheider, S., Machala, M., Guan, Z., Chen, D., Hjelm, J., Jacobsen, T., Chueh, W. C., Mogensen, M. B. & Chatzichristodoulou, C., 2017.

Research output: Contribution to conferenceConference abstract for conferenceResearchpeer-review

Open Access
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185 Downloads (Pure)

Chemical and Electrochemical Properties of La0.58Sr0.4Fe0.8Co0.2O3-δ (LSCF) Thin Films upon Oxygen Reduction and Evolution Reactions

Pitscheider, S., Machala, M., Guan, Z., Chen, D., Hjelm, J., Jacobsen, T., Chueh, W. C., Mogensen, M. B. & Chatzichristodoulou, C., 2017, In : Electrochemical Society. Meeting Abstracts (Online). MA2017-02 , p. 1 1742.

Research output: Contribution to journalConference abstract in journalResearchpeer-review

Open Access

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

Boccaccini, D. N., Sevecek, O., Frandsen, H. L., Dlouhy, I., Molin, S., Charlas, B., Hjelm, J., Cannio, M. & Hendriksen, P. V., 2017, In : Journal of the European Ceramic Society. 37, 11, p. 3565-3578

Research output: Contribution to journalJournal articleResearchpeer-review

Durable fuel electrode

Brodersen, K., Hauch, A., Chen, M. & Hjelm, J., 23 Feb 2017, IPC No. H01M 8/ 124 A I, Patent No. WO2017029350, 23 Feb 2017, Priority date 18 Aug 2015, Priority No. EP20150181381

Research output: Patent

Open Access
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417 Downloads (Pure)

Electrochemical Characterization of a PEMEC Using Impedance Spectroscopy

Elsøe, K., Grahl-Madsen, L., Hjelm, J., Scherer, G. G., Hjelm, J. & Mogensen, M. B., 2017, In : Journal of The Electrochemical Society. 164, 13, p. F1419-F1426

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
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376 Downloads (Pure)
2016

An Ag based brazing system with a tunable thermal expansion for the use as sealant for solid oxide cells

Kiebach, W-R., Engelbrecht, K., Grahl-Madsen, L., Sieborg, B., Chen, M., Hjelm, J., Norrman, K., Chatzichristodoulou, C. & Hendriksen, P. V., 2016, In : Journal of Power Sources. 315, p. 339-350 12 p.

Research output: Contribution to journalJournal articleResearchpeer-review

An Electrochemical Impedance Spectroscopy Study on the Effects of the Surface- and Solution-Based Mechanisms in Li-O2Cells

Knudsen, K. B., Vegge, T., McCloskey, B. D. & Hjelm, J., 2016, In : Journal of the Electrochemical Society. 163, 9, p. A2065-A2071 7 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
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550 Downloads (Pure)

An Electrochemical Impedance Study of the Capacity Limitations in Na–O2 Cells

Knudsen, K. B., Nichols, J. E., Vegge, T., Luntz, A. C., McCloskey, B. D. & Hjelm, J., 2016, In : The Journal of Physical Chemistry Part C. 120, 20, p. 10799–10805

Research output: Contribution to journalJournal articleResearchpeer-review

Electrochemical Characterization of PEMECs Operating at Various Current Densities

Elsøe, K., G.-Madsen, L., Scherer, G. G., Hjelm, J. & Mogensen, M. B., 2016, In : Electrochemical Society. Meeting Abstracts (Online). MA2016-02, 38, 2408.

Research output: Contribution to journalConference abstract in journalResearchpeer-review

Open Access
Open Access

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

Scipioni, R., Jørgensen, P. S., Ngo, D-T., Simonsen, S. B., Liu, Z., Yakal-Kremski, K. J., Wang, H., Hjelm, J., Norby, P., Barnett, S. A. & Jensen, S. H., 2016, In : Journal of Power Sources. 307, p. 259-269 11 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
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611 Downloads (Pure)

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

Boccaccini, D. N., Sevecek, O., Frandsen, H. L., Dlouhy, I., Molin, S., Cannio, M., Hjelm, J. & Hendriksen, P. V., 2016, In : Materials Letters. 162, p. 250–253

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
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346 Downloads (Pure)

Kinetic Studies on State of the Art Solid Oxide Cells: A Comparison between Hydrogen/Steam and Reformate Fuels

Njodzefon, J-C., Graves, C. R., Mogensen, M. B., Weber, A. & Hjelm, J., 2016, In : Journal of The Electrochemical Society. 163, 13, p. F1451-F1462 12 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
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255 Downloads (Pure)

Quantitative review of degradation and lifetime of solid oxide cells and stacks

Skafte, T. L., Hjelm, J., Blennow, P. & Graves, C. R., 2016, Proceedings of 12th European SOFC & SOE Forum 2016. European Fuel Cell Forum, p. 8-27 19 p. B0501

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Open Access
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2483 Downloads (Pure)
2015

Analysis of the Interphase on Carbon Black Formed in High Voltage Batteries

Younesi, R., Christiansen, A. S., Scipioni, R., Ngo, D-T., Simonsen, S. B., Edström, K., Hjelm, J. & Norby, P., 2015. 1 p.

Research output: Contribution to conferenceConference abstract for conferenceResearchpeer-review

Open Access
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212 Downloads (Pure)

Analysis of the Interphase on Carbon Black Formed in High Voltage Batteries

Younesi, R., Christiansen, A. S., Scipioni, R., Ngo, D-T., Simonsen, S. B., Edström, K., Hjelm, J. & Norby, P., 2015, In : Journal of The Electrochemical Society. 162, 7, p. A1289-A1296

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
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446 Downloads (Pure)

An Electrochemical Impedance Spectroscopy Investigation of the Overpotentials in Li−O2 Batteries

Højberg, J., McCloskey, B. D., Hjelm, J., Vegge, T., Johansen, K., Norby, P. & Luntz, A. C., 2015, In : A C S Applied Materials and Interfaces. 7, 7, p. 4039−4047

Research output: Contribution to journalJournal articleResearchpeer-review

A Study of e- Transport through Li2O2, the Main Discharge Product in the Li-O2 Battery

Knudsen, K. B., Jensen, S. H., Luntz, A. C. & Hjelm, J., 2015, In : Electrochemical Society. Meeting Abstracts (Online). MA2015-01, 2, p. 20367-367 1 p.

Research output: Contribution to journalConference abstract in journalResearchpeer-review

Carbon Deposition during CO2 Electrolysis in Ni-Based Solid-Oxide-Cell Electrodes

Skafte, T. L., Graves, C. R., Blennow, P. & Hjelm, J., 2015, In : Electrochemical Society. Meeting Abstracts (Online). MA2015-03, 395, 9 p.

Research output: Contribution to journalConference abstract in journalResearchpeer-review

Carbon Deposition during CO2 Electrolysis in Ni-Based Solid-Oxide-Cell Electrodes

Skafte, T. L., Graves, C. R., Blennow, P. & Hjelm, J., 2015, In : E C S Transactions. 68, 1, p. 3429-3437 9 p.

Research output: Contribution to journalConference articleResearchpeer-review

Degradation Studies on LiFePO4 cathode

Scipioni, R., Jørgensen, P. S., Hjelm, J., Norby, P., Rasmussen, C. N. & Jensen, S. H., 2015, In : E C S Transactions. 64, 22, p. 97-106

Research output: Contribution to journalConference articleResearchpeer-review

Electrochemical Impedance Spectroscopy as a Tool for PEMECs Development

Elsøe, K., Hjelm, J. & Mogensen, M. B., 2015, Book of Abstracts. DTU's Sustain Conference 2015. Lyngby: Technical University of Denmark, 1 p. E-25

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsResearchpeer-review

Open Access
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145 Downloads (Pure)

Enhancement of the chemical stability in confined δ-Bi2O3

Sanna, S., Esposito, V., Andreasen, J. W., Hjelm, J., Zhang, W., Kasama, T., Simonsen, S. B., Christensen, M., Linderoth, S. & Pryds, N., 2015, In : Nature Materials. 14, 5, p. 500-504 5 p.

Research output: Contribution to journalLetterResearchpeer-review

3 Downloads (Pure)

Fabrication of thin yttria-stabilized-zirconia dense electrolyte layers by inkjet printing for high performing solid oxide fuel cells

Esposito, V., Gadea, C., Hjelm, J., Marani, D., Hu, Q., Agersted, K., Ramousse, S. & Jensen, S. H., 2015, In : Journal of Power Sources. 273, p. 89-95

Research output: Contribution to journalJournal articleResearchpeer-review

Influence of hydroxyl content of binders on rheological properties of cerium-gadolinium oxide (CGO) screen printing inks

Marani, D., Gadea, C., Hjelm, J., Hjalmarsson, P., Wandel, M. & Kiebach, W-R., 2015, In : Journal of the European Ceramic Society. 35, 5, p. 1495–1504 10 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Kinetic Studies on Ni-YSZ Composite Electrodes

Njodzefon, J-C., Hjelm, J., Graves, C. R. & Sudireddy, B. R., 2015, In : Electrochemical Society. Meeting Abstracts (Online). MA2015-03, 1, 261.

Research output: Contribution to journalConference abstract in journalResearchpeer-review

Kinetic Studies on Ni-YSZ Composite Electrodes

Njodzefon, J-C., Sudireddy, B. R., Hjelm, J. & Graves, C. R., 2015, In : ECS Transactions. 68, 1, p. 1169-1184 16 p.

Research output: Contribution to journalConference articleResearchpeer-review

Kinetic Studies on State of the Art Solid Oxide Cells – A Comparison between Hydrogen/Steam and Reformate Fuels

Njodzefon, J-C., Graves, C. R., Mogensen, M. B., Weber, A. & Hjelm, J., 2015, In : E C S Transactions. 64, 18, p. 51-65

Research output: Contribution to journalConference articleResearchpeer-review

Low - voltage FIB/SEM Tomography for 3D Microstructure Evolution of LiFePO4/C Electrode

Scipioni, R., Jørgensen, P. S., Ngo, D-T., Simonsen, S. B., Hjelm, J., Norby, P. & Jensen, S. H., 2015, In : Electrochemical Society. Meeting Abstracts (Online). MA2015-02, 1, p. 42 1 p.

Research output: Contribution to journalConference abstract in journalResearchpeer-review

Low-voltage FIB/SEM Tomography for 3D Microstructure Evolution of LiFePO4/C Electrode

Scipioni, R., Jørgensen, P. S., Ngo, D-T., Simonsen, S. B., Hjelm, J., Norby, P. & Jensen, S. H., 2015, In : E C S Transactions. 69, 18, p. 71-80 10 p.

Research output: Contribution to journalConference articleResearchpeer-review

Open Access
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434 Downloads (Pure)

Reactions and SEI Formation during Charging of Li-O2 Cells

Højberg, J., Knudsen, K. B., Hjelm, J. & Vegge, T., 2015, In : E C S Electrochemistry Letters. 4, 7, p. A63-A66

Research output: Contribution to journalJournal articleResearchpeer-review

Redox Probing Study of the Potential Dependence of Charge Transport Through Li2O2

Knudsen, K. B., Luntz, A. C., Jensen, S. H., Vegge, T. & Hjelm, J., 2015, In : The Journal of Physical Chemistry Part C. 119, 51, p. 28292–28299 8 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
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230 Downloads (Pure)

SOFC brændselsceller i et intelligent elnet

Hjelm, J., 2015, In : FIB - Forskning i Bioenergi, Brint & Brændselsceller. 12, 52, p. 27-27 1 p.

Research output: Contribution to journalJournal articleResearch

Open Access
File
166 Downloads (Pure)

Sulfur Poisoning of Ni/stabilized-zirconia Anodes: Effect on Long-Term Durability

Hauch, A., Hagen, A., Hjelm, J. & Ramos, T., 2015

Research output: Non-textual formSound/Visual production (digital)Research

2014

Advanced impedance modeling of solid oxide electrochemical cells

Graves, C. R. & Hjelm, J., 2014, Proceedings of 11th European SOFC and SOE Forum 2014. European Fuel Cell Forum, 16 p. B1203

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

51 Downloads (Pure)

Communication: The influence of CO2 poisoning on overvoltages and discharge capacity in non-aqueous Li-Air batteries

Mekonnen, Y. S., Knudsen, K. B., Mýrdal, J. S. G., Younesi, R., Højberg, J., Hjelm, J., Norby, P. & Vegge, T., 2014, In : Journal of Chemical Physics. 140, 5 p., 121101.

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
File
298 Downloads (Pure)

Degradation Studies on LiFePO4 cathode

Scipioni, R., Jørgensen, P. S., Hjelm, J., Norby, P., Rasmussen, C. N. & Jensen, S. H., 2014, In : Electrochemical Society. Meeting Abstracts (Online). MA2014-02, 5, p. 382 1 p.

Research output: Contribution to journalConference abstract in journalResearchpeer-review

Open Access
File
281 Downloads (Pure)

Fuel flow distribution in SOFC stacks revealed by impedance spectroscopy

Mosbæk, R. R., Hjelm, J., Barfod, R. & Hendriksen, P. V., 2014, Proceedings of 11th European SOFC and SOE Forum 2014. European Fuel Cell Forum, 10 p. A0902

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Impedance of SOFC electrodes: A review and a comprehensive case study on the impedance of LSM:YSZ cathodes

Nielsen, J. & Hjelm, J., 2014, In : Electrochimica Acta. 115, p. 31-45

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
File
417 Downloads (Pure)

Impedance perspectives on Li-air battery overpotentials

Højberg, J., McCloskey, B. D., Luntz, A. C., Hjelm, J., Johansen, K., Norby, P. & Vegge, T., 2014. 1 p.

Research output: Contribution to conferenceConference abstract for conferenceResearchpeer-review

File
133 Downloads (Pure)