• Fysikvej, 310, 320

    2800 Kgs. Lyngby

    Denmark

20072022
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Research Output 2007 2020

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Journal article
2020

Molecular Engineering Strategies for Symmetric Aqueous Organic Redox Flow Batteries

Fornari, R. P., Mesta, M., Hjelm, J., Vegge, T. & de Silva, P., 2020, (Accepted/In press) In : ACS Materials Letters .

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

203 Downloads (Pure)

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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13 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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2017
1307 Downloads (Pure)

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
File
57 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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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

280 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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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

464 Downloads (Pure)

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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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

525 Downloads (Pure)

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
File
270 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
File
190 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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2015
362 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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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

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

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

163 Downloads (Pure)

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
File
142 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
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2014
225 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
329 Downloads (Pure)

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
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Rheological analysis of stabilized cerium-gadolinium oxide (CGO) dispersions

Marani, D., Hjelm, J. & Wandel, M., 2014, In : Journal of the European Ceramic Society. 34, 3, p. 695–702

Research output: Contribution to journalJournal articleResearchpeer-review

Structural instability and electrical properties in epitaxial Er2O3-stabilized Bi2O3 thin films

Sanna, S., Esposito, V., Graves, C. R., Hjelm, J., Andreasen, J. W. & Pryds, N., 2014, In : Solid State Ionics. 266, p. 13-18

Research output: Contribution to journalJournal articleResearchpeer-review

297 Downloads (Pure)

Sulfur Poisoning of SOFC Anodes: Effect of Overpotential on Long-Term Degradation

Hauch, A., Hagen, A., Hjelm, J. & Ramos, T., 2014, In : Journal of The Electrochemical Society. 161, 6, p. F734-F743

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
File
2013
2 Downloads (Pure)

Durability and Performance of High Performance Infiltration Cathodes

Samson, A. J., Søgaard, M., Hjalmarsson, P., Hjelm, J., Bonanos, N., Foghmoes, S. P. V. & Ramos, T., 2013, In : Fuel Cells. 13, 4, p. 511-519

Research output: Contribution to journalJournal articleResearchpeer-review

2012

Electrochemical Switching of Conductance with Diarylethene-Based Redox-Active Polymers

Logtenberg, H., van der Velde, J. H. M., de Mendoza, P., Areephong, J., Hjelm, J., Feringa, B. L. & Browne, W. R., 2012, In : The Journal of Physical Chemistry Part C. 116, p. 24136−24142

Research output: Contribution to journalJournal articleResearchpeer-review

1 Downloads (Pure)

Highly durable anode supported solid oxide fuel cell with an infiltrated cathode

Samson, A. J., Hjalmarsson, P., Søgaard, M., Hjelm, J. & Bonanos, N., 2012, In : Journal of Power Sources. 216, p. 124-130

Research output: Contribution to journalJournal articleResearchpeer-review

2011

A high performance ceria based interdiffusion barrier layer prepared by spin-coating

Plonczak, P., Joost, M., Hjelm, J., Søgaard, M., Lundberg, M. & Hendriksen, P. V., 2011, In : Journal of Power Sources. 196, 3, p. 1156-1162

Research output: Contribution to journalJournal articleResearchpeer-review

Durability of Solid Oxide Cells

Knibbe, R., Hauch, A., Hjelm, J., Ebbesen, S. D. & Mogensen, M. B., 2011, In : Green. 16, 2, p. 141-169

Research output: Contribution to journalJournal articleResearchpeer-review

Planar metal-supported SOFC with novel cermet anode

Blennow Tullmar, P., Hjelm, J., Klemensø, T., Persson, Å. H., Ramousse, S. & Mogensen, M. B., 2011, In : Fuel Cells. 11, 5, p. 661-668

Research output: Contribution to journalJournal articleResearchpeer-review

Towards Quantification of Relations Between Electrode Polarisation and Microstructure

Ramos, T., Hjelm, J. & Mogensen, M. B., 2011, In : Journal of The Electrochemical Society. 158, 7, p. B814-B824

Research output: Contribution to journalJournal articleResearchpeer-review

2010

Cathode-Electrolyte Interfaces with CGO Barrier Layers in SOFC

Knibbe, R., Hjelm, J., Menon, M., Pryds, N., Søgaard, M., Wang, H-J. & Neufeld, K., 2010, In : Journal of the American Ceramic Society. 93, 9, p. 2877-2883

Research output: Contribution to journalJournal articleResearchpeer-review

2008

Electro- and photochemical switching of dithienylethene self-assembled monolayers on gold electrodes

Browne, W. R., Kudernac, T., Katsonis, N., Areephong, J., Hjelm, J. & Feringa, B. L., 2008, In : Journal of Physical Chemistry C. 112, 4, p. 1183-1190

Research output: Contribution to journalJournal articleResearchpeer-review

On/Off Photoswitching of the Electropolymerizability of Terthiophenes

Areephong, J., Kudernac, T., de Jong, J. J. D., Carroll, G. T., Pantorott, D., Hjelm, J., Browne, W. R. & Feringa, B. L., 2008, In : Journal of the American Chemical Society. 130, 39, p. 12850-12851

Research output: Contribution to journalJournal articleResearchpeer-review

Photochromism and electrochemistry of a dithienylcyclopentene electroactive polymer

Wesenhagen, P., Areephong, J., Landaluce, T. F., Heureux, N., Katsonis, N., Hjelm, J., Rudolf, P., Browne, W. R. & Feringa, B. L., 2008, In : Langmuir. 24, 12, p. 6334-6342

Research output: Contribution to journalJournal articleResearchpeer-review

2007

Synthesis and characterization of dinuclear ruthenium(II) complexes based on 4,4'-bipyridyl type gridging ligands

Guckian, A. L., Browne, W. R., Hjelm, J. & Vos, J. G., 2007, In : Journal of the Chinese Chemical Society. 54, p. 1151-1161

Research output: Contribution to journalJournal articleResearchpeer-review