Niels J. Bjerrum

2024

Chromium Oxide-Ruthenium Oxide Solid Solution Anode Implemented in a Solid Phosphate Electrolyzer at 240 °C and 28 Bar Overpressure

Bannert, F., Christensen, E., Berg, R. W., Köhler, K. & Bjerrum, N. J., 2024, In: Journal of the Electrochemical Society. 171, 1, 5 p., 013505.

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2023

Methanol Synthesis from CO₂ and H₂O Using a Solid Phosphate Electrolyzer at 240 °C and 28 Bar

Christensen, E., Berg, R. W., Krüger, R. & Bjerrum, N. J., 2023, In: Journal of The Electrochemical Society. 170, 6 p., 014502.

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2022

Pressurized solid phosphate electrolyzer for medium temperature water splitting

Bretzler, P., Christensen, E., Berg, R. W. & Bjerrum, N. J., 2022, In: Ionics. 28, p. 3421-3433 13 p.

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2021

Vapor pressure and specific electrical conductivity in the H₂O–LiH₂PO₄–LiPO₃ system—a novel electrolyte for water electrolysis at elevated temperature

Berg, R. W., Nikiforov, A. V. & Bjerrum, N. J., 2021, In: Ionics. 27, 2, p. 703–719

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2020

CsH₂PO₄ as Electrolyte for the Formation of CH₄by Electrochemical Reduction of CO₂

Christensen, E., Petrushina, I., Nikiforov, A. V., Berg, R. W. & Bjerrum, N. J., 2020, In: Journal of the Electrochemical Society. 167, 4, 5 p., 044511.

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CsH₂PO₄ is not stable at 260 °C unless confined. Comments to article by C.E. Botez, I. Martinez, A. Price, H. Martinez, and J.H. Leal in J. Phys. Chem. Solids 129 (2019) 324-328

Berg, R. W., Nikiforov, A. V. & Bjerrum, N. J., 2020, In: Journal of Physics and Chemistry of Solids. 136, 3 p., 109177.

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Efficient water splitting electrolysis on a platinum-free tungsten carbide electrocatalyst in molten CsH₂PO₄ at 350–390 °C

Bretzler, P., Köhler, K., Nikiforov, A. V., Christensen, E., Berg, R. W. & Bjerrum, N. J., 2020, In: International Journal of Hydrogen Energy. 45, 41, p. 21262-21272

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Voltammetric study of one-step electrochemical methane production during water and CO₂ co-electrolysis in molten CsH₂PO₄

Nikiforov, A. V., Petrushina, I., Christensen, E., Berg, R. W. & Bjerrum, N. J., 2020, In: Renewable Energy. 145, p. 508-513 6 p.

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2019

Influence of oxygen on the cathode in HT-PEM fuel cells

Søndergaard, S., Cleemann, L. N., Jensen, J. O. & Bjerrum, N. J., 2019, In: International Journal of Hydrogen Energy. 44, 36, p. 20379-20388 10 p.

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2018

Synthesis and stability of strongly acidic benzamide derivatives

Diness, F., Bjerrum, N. J., Begtrup, M. & O'Hagan, D. (Editor), 2018, In: Beilstein Journal of Organic Chemistry. 14, p. 523-530

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Vapor pressure and specific electrical conductivity in the solid and molten H₂O-CsH₂PO₄-CsPO₃ system—a novel electrolyte for water electrolysis at ~ 225–400 °C

Nikiforov, A. V., Berg, R. W. & Bjerrum, N. J., 2018, In: Ionics. 24, 9, p. 2761-2782

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2017

Influence of carbon monoxide on the cathode in high-temperature polymer electrolyte membrane fuel cells

Søndergaard, S., Cleemann, L. N., Jensen, J. O. & Bjerrum, N. J., 2017, In: International Journal of Hydrogen Energy. 42, 5, p. 3309-3315

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2016

Amino-Functional Polybenzimidazole Blends with Enhanced Phosphoric Acid Mediated Proton Conductivity as Fuel Cell Electrolytes

Aili, D., Javakhishvili, I., Han, J., Jankova Atanasova, K., Pan, C., Hvilsted, S., Jensen, J. O., Bjerrum, N. J. & Li, Q., 2016, In: Macromolecular Chemistry and Physics. 217, 10, p. 1161-1168

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Determination of Water Vapor Pressure Over Corrosive Chemicals Versus Temperature Using Raman Spectroscopy as Exemplified with 85.5% Phosphoric Acid

Rodier, M., Li, Q., Berg, R. W. & Bjerrum, N. J., 2016, In: Applied Spectroscopy. 70, 7, p. 1186-1194 9 p.

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Kinetic Study of the Chemical Vapor Deposition of Tantalum in Long Narrow Channels

Mugabi, J. A., Eriksen, S., Petrushina, I., Christensen, E. & Bjerrum, N. J., 2016, In: Advanced Materials Interfaces. 3, 14, 9 p.

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Specific electrical conductivity in molten potassium dihydrogen phosphate KH₂PO₄ - An electrolyte for water electrolysis at ∼300°C

Nikiforov, A. V., Berg, R. W., Petrushina, I. & Bjerrum, N. J., 2016, In: Applied Energy. 175, p. 545-550 6 p.

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Understanding ternary poly(potassium benzimidazolide)-based polymer electrolytes

Aili, D., Jankova Atanasova, K., Han, J., Bjerrum, N. J., Jensen, J. O. & Li, Q., 2016, In: Polymer. 84, p. 304-310 7 p.

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Water vapor pressure over molten KH₂PO₄ and demonstration of water electrolysis at ∼300ºC

Berg, R. W., Nikiforov, A. V., Petrushina, I. & Bjerrum, N. J., 2016, In: Applied Energy. 180, p. 269-275 7 p.

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2015

CsH₂PO₄/NdPO₄ Composites as Proton Conducting Electrolytes for Intermediate Temperature Fuel Cells

Anfimova, T., Jensen, A. H., Christensen, E., Jensen, J. O., Bjerrum, N. J. & Li, Q., 2015, In: Journal of The Electrochemical Society. 162, 4, p. F436-F441

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Fe₃C-based oxygen reduction catalysts: synthesis, hollow spherical structures and applications in fuel cells

Hu, Y., Jensen, J. O., Zhang, W., Fernandez, S. M., Chenitz, R., Pan, C., Xing, W., Bjerrum, N. J. & Li, Q., 2015, In: Journal of Materials Chemistry A. 3, p. 1752-1760

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Porous poly(perfluorosulfonic acid) membranes for alkaline water electrolysis

Aili, D., Hansen, M. K., Andreasen, J. W., Zhang, J., Jensen, J. O., Bjerrum, N. J. & Li, Q., 2015, In: Journal of Membrane Science. 493, p. 589–598

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Pt-Si Bifunctional Surfaces for CO and Methanol Electro-Oxidation

Permyakova, A. A., Han, B., Jensen, J. O., Bjerrum, N. & Shao-Horn, Y., 2015, In: The Journal of Physical Chemistry Part C. 119, 15, p. 8023-8031

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Space-confined preparation of high surface area tungsten oxide and tungsten nitride inside the pores of mesoporous silica SBA-15

Meyer, S., Beyer, H., Köhler, K., Jensen, A. H., Christensen, E. & Bjerrum, N., 2015, In: Microporous and Mesoporous Materials. 211, p. 147-151 5 p.

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The effect of preparation method on the proton conductivity of indium doped tin pyrophosphates

Anfimova, T., Lie-Andersen, T., Jensen, E. P., Prag, C. B., Nielsen, U. G., Sørensen, D. R., Skou, E. M., Christensen, E., Bjerrum, N. J. & Li, Q., 2015, In: Solid State Ionics. 278, p. 209-216 8 p.

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The stability of poly(2,2′-(m-phenylene)-5,5′-bibenzimidazole) membranes in aqueous potassium hydroxide

Aili, D., Jankova Atanasova, K., Li, Q., Bjerrum, N. J. & Jensen, J. O., 2015, In: Journal of Membrane Science. 492, p. 422-429 8 p.

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Transition metal carbides (WC, Mo₂C, TaC, NbC) as potential electrocatalysts for the hydrogen evolution reaction (HER) at medium temperatures

Meyer, S., Nikiforov, A. V., Petrushina, I. M., Köhler, K., Christensen, E., Jensen, J. O. & Bjerrum, N. J., 2015, In: International Journal of Hydrogen Energy. 40, 7, p. 2905-2911

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2014

Direct Synthesis of Fe3C-Functionalized Graphene by High Temperature Autoclave Pyrolysis for Oxygen Reduction

Hu, Y., Jensen, J. O., Zhang, W., Huang, Y., Cleemann, L. N., Xing, W., Bjerrum, N. J. & Li, Q., 2014, In: ChemSusChem (Print). 7, 8, p. 2099-2103 5 p.

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Highly active and stable Pt electrocatalysts promoted by antimony-doped SnO₂ supports for oxygen reduction reactions

Yin, M., Xu, J., Li, Q., Jensen, J. O., Huang, Y., Cleemann, L. N., Bjerrum, N. J. & Xing, W., 2014, In: Applied Catalysis B: Environmental. 144, p. 112-120

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High Molecular Weight Polybenzimidazole Membranes for High Temperature PEMFC

Yang, J., Cleemann, L. N., Steenberg, T., Terkelsen, C., Li, Q., Jensen, J. O., Hjuler, H. A., Bjerrum, N. J. & He, R. H., 2014, In: Fuel Cells. 14, 1, p. 7-15

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High Surface Area Tungsten Carbides: Synthesis, Characterization and Catalytic Activity towards the Hydrogen Evolution Reaction in Phosphoric Acid at Elevated Temperatures

Tomás García, A. L., Li, Q., Jensen, J. O. & Bjerrum, N. J., 2014, In: International Journal of Electrochemical Science. 9, p. 1016-1032

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Hollow Spheres of Iron Carbide Nanoparticles Encased in Graphitic Layers as Oxygen Reduction Catalysts

Hu, Y., Jensen, J. O., Zhang, W., Cleemann, L. N., Xing, W., Bjerrum, N. J. & Li, Q., 2014, In: Angewandte Chemie. 126, 14, p. 3749-3753

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Hollow Spheres of Iron Carbide Nanoparticles Encased in Graphitic Layers as Oxygen Reduction Catalysts

Hu, Y., Jensen, J. O., Zhang, W., Cleemann, L. N., Xing, W., Bjerrum, N. J. & Li, Q., 2014, In: Angewandte Chemie International Edition. 53, 14, p. 3675 –3679

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Hydrogen evolution activity and electrochemical stability of selected transition metal carbides in concentrated phosphoric acid

Tomás García, A. L., Jensen, J. O., Bjerrum, N. J. & Li, Q., 2014, In: Electrochimica Acta. 137, p. 639-646 8 p.

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Intermediate Temperature Fuel Cell Using CsH₂PO₄/ZrO₂-Based Composite Electrolytes

Jensen, A. H., Li, Q., Christensen, E. & Bjerrum, N. J., 2014, In: Journal of the Electrochemical Society. 161, 1, p. F72-F76

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Oxygen evolution catalysts on supports with a 3-D ordered array structure and intrinsic proton conductivity for proton exchange membrane steam electrolysis

Xu, J., Aili, D., Li, Q., Christensen, E., Jensen, J. O., Zhang, W., Hansen, M. K., Liu, G., Wang, X. & Bjerrum, N. J., 2014, In: Energy & Environmental Science. 7, 2, p. 820-830

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Phosphate-Doped Carbon Black as Pt Catalyst Support: Co-catalytic Functionality for Dimethyl Ether and Methanol Electro-oxidation

Yin, M., Huang, Y., Li, Q., Jensen, J. O., Cleemann, L. N., Zhang, W., Bjerrum, N. J. & Xing, W., 2014, In: ChemElectroChem. 1, 2, p. 448-454 7 p.

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The Electrochemical Behavior of Phosphoric-Acid-Doped Poly(perfluorosulfonic Acid) Membranes

Aili, D., Savinell, R. F., Jensen, J. O., Cleemann, L. N., Bjerrum, N. J. & Li, Q., 2014, In: ChemElectroChem. 1, p. 1471–1475

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Thermal Stability and Proton Conductivity of Rare Earth Orthophosphate Hydrates

Anfimova, T., Li, Q., Jensen, J. O. & Bjerrum, N. J., 2014, In: International Journal of Electrochemical Science. 9, p. 2285 - 2300

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2013

Antimony doped tin oxide modified carbon nanotubes as catalyst supports for methanol oxidation and oxygen reduction reactions

Xu, J., Aili, D., Li, Q., Pan, C., Christensen, E., Jensen, J. O., Zhang, W., Liu, G., Wang, X. & Bjerrum, N. J., 2013, In: Journal of Materials Chemistry A. 1, 34, p. 9737-9745

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Benzimidazole grafted polybenzimidazoles for proton exchange membrane fuel cells

Yang, J., Aili, D., Li, Q., Xu, Y., Liu, P., Che, Q., Jensen, J. O., Bjerrum, N. J. & He, R., 2013, In: Polymer Chemistry. 4, 17, p. 4768-4775

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Catalyst Degradation in High Temperature Proton Exchange Membrane Fuel Cells Based on Acid Doped Polybenzimidazole Membranes

Cleemann, L. N., Buazar, F., Li, Q., Jensen, J. O., Pan, C., Steenberg, T., Dai, S. & Bjerrum, N. J., 2013, In: Fuel Cells. 13, 5, p. 822-831

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Covalently Cross-Linked Sulfone Polybenzimidazole Membranes with Poly(Vinylbenzyl Chloride) for Fuel Cell Applications

Yang, J., Aili, D., Li, Q., Cleemann, L. N., Jensen, J. O., Bjerrum, N. J. & He, R., 2013, In: ChemSusChem (Print). 6, 2, p. 275-282

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Crosslinked Hexafluoropropylidene Polybenzimidazole Membranes with Chloromethyl Polysulfone for Fuel Cell Applications

Yang, J., Li, Q., Cleemann, L. N., Jensen, J. O., Pan, C., Bjerrum, N. J. & He, R., 2013, In: Advanced Energy Materials. 3, 5, p. 622-630

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Development and Study of Tantalum and Niobium Carbides as Electrocatalyst Supports for the Oxygen Electrode for PEM Water Electrolysis at Elevated Temperatures

Nikiforov, A., Petrushina, I., Prag, C. B., Polonsky, J., Christensen, E. & Bjerrum, N., 2013, In: E C S Transactions. 45, 21, p. 59-67

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Heterogeneous anion conducting membranes based on linear and crosslinked KOH doped polybenzimidazole for alkaline water electrolysis

Aili, D., Hansen, M. K., Renzaho, R. F., Li, Q., Christensen, E., Jensen, J. O. & Bjerrum, N. J., 2013, In: Journal of Membrane Science. 447, p. 424-432

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Indium doped niobium phosphates as intermediate temperature proton conductors

Huang, Y., Li, Q., Anfimova, T., Christensen, E., Yin, M., Jensen, J. O., Bjerrum, N. J. & Xing, W., 2013, In: International Journal of Hydrogen Energy. 38, 5, p. 2464-2470

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Oxidative degradation of acid doped polybenzimidazole membranes and fuel cell durability in the presence of ferrous ions

Liao, J., Yang, J., Li, Q., Cleemann, L. N., Jensen, J. O., Bjerrum, N. J., He, R. & Xing, W., 2013, In: Journal of Power Sources. 238, p. 516-522

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Platinum Activated IrO2/SnO2 Nanocatalysts and Their Electrode Structures for High Performance Proton Exchange Membrane Water Electrolysis

Xu, J., Li, Q., Christensen, E., Wang, X. & Bjerrum, N. J., 2013, In: International Journal of Electrochemical Science. 8, 2, p. 2388-2406

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Synthesis of self-supported non-precious metal catalysts for oxygen reduction reaction with preserved nanostructures from the polyaniline nanofiber precursor

Hu, Y., Zhao, X., Huang, Y., Li, Q., Bjerrum, N. J., Liu, C. & Xing, W., 2013, In: Journal of Power Sources. 225, p. 129-136

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2012

Direct dimethyl ether fueling of a high temperature polymer fuel cell

Jensen, J. O., Vassiliev, A., Olsen, M. I., Li, Q., Pan, C., Cleemann, L. N., Steenberg, T., Hjuler, H. A. & Bjerrum, N. J., 2012, In: Journal of Power Sources. 211, p. 173-176

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Niels J. Bjerrum

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