Electrolyte effects on the stability of Ni-Mo cathodes for the hydrogen evolution reaction

Jochem H.J. Wijten, Romy L. Riemersma, Joe Gauthier, Laurens D.B. Mandemaker, Tiny Verhoeven, Jan Philipp Hofmann, Karen Chan, Bert M. Weckhuysen (Corresponding author)

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Abstract

Water electrolysis to form hydrogen as a solar fuel requires highly effective catalysts. In this work, theoretical and experimental studies are performed on the activity and stability of Ni-Mo cathodes for this reaction. Density functional theory studies show various Ni-Mo facets to be active for the hydrogen evolution reaction, Ni segregation to be thermodynamically favorable, and Mo vacancy formation to be favorable even without an applied potential. Electrolyte effects on the long-term stability of Ni-Mo cathodes are determined. Ni-Mo is compared before and after up to 100 h of continuous operation. It is shown that Ni-Mo is unstable in alkaline media, owing to Mo leaching in the form of MoO 4 2- , ultimately leading to a decrease in absolute overpotential. It is found that the electrolyte, the alkali cations, and the pH all influence Mo leaching. Changing the cation in the electrolyte from Li to Na to K influences the surface segregation of Mo and pushes the reaction towards Mo dissolution. Decreasing the pH decreases the OH - concentration and in this manner inhibits Mo leaching. Of the electrolytes studied, in terms of stability, the best to use is LiOH at pH 13. Thus, a mechanism for Mo leaching is presented alongside ways to influence the stability and make the Ni-Mo material more viable for renewable energy storage in chemical bonds.

Original languageEnglish
Pages (from-to)3491-3500
Number of pages10
JournalChemSusChem
Volume12
Issue number15
DOIs
Publication statusPublished - 8 Aug 2019

Fingerprint

electrolyte
Electrolytes
Leaching
Hydrogen
Cathodes
leaching
hydrogen
Cations
cation
Positive ions
Surface segregation
Chemical bonds
Alkalies
theoretical study
Electrolysis
Energy storage
Vacancies
Density functional theory
electrokinesis
Dissolution

Bibliographical note

© 2019 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.

Keywords

  • electrocatalysis
  • electrodes
  • electrolytes
  • solar fuels
  • water splitting

Cite this

Wijten, J. H. J., Riemersma, R. L., Gauthier, J., Mandemaker, L. D. B., Verhoeven, T., Hofmann, J. P., ... Weckhuysen, B. M. (2019). Electrolyte effects on the stability of Ni-Mo cathodes for the hydrogen evolution reaction. ChemSusChem, 12(15), 3491-3500. https://doi.org/10.1002/cssc.201900617
Wijten, Jochem H.J. ; Riemersma, Romy L. ; Gauthier, Joe ; Mandemaker, Laurens D.B. ; Verhoeven, Tiny ; Hofmann, Jan Philipp ; Chan, Karen ; Weckhuysen, Bert M. / Electrolyte effects on the stability of Ni-Mo cathodes for the hydrogen evolution reaction. In: ChemSusChem. 2019 ; Vol. 12, No. 15. pp. 3491-3500.
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abstract = "Water electrolysis to form hydrogen as a solar fuel requires highly effective catalysts. In this work, theoretical and experimental studies are performed on the activity and stability of Ni-Mo cathodes for this reaction. Density functional theory studies show various Ni-Mo facets to be active for the hydrogen evolution reaction, Ni segregation to be thermodynamically favorable, and Mo vacancy formation to be favorable even without an applied potential. Electrolyte effects on the long-term stability of Ni-Mo cathodes are determined. Ni-Mo is compared before and after up to 100 h of continuous operation. It is shown that Ni-Mo is unstable in alkaline media, owing to Mo leaching in the form of MoO 4 2- , ultimately leading to a decrease in absolute overpotential. It is found that the electrolyte, the alkali cations, and the pH all influence Mo leaching. Changing the cation in the electrolyte from Li to Na to K influences the surface segregation of Mo and pushes the reaction towards Mo dissolution. Decreasing the pH decreases the OH - concentration and in this manner inhibits Mo leaching. Of the electrolytes studied, in terms of stability, the best to use is LiOH at pH 13. Thus, a mechanism for Mo leaching is presented alongside ways to influence the stability and make the Ni-Mo material more viable for renewable energy storage in chemical bonds.",
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Wijten, JHJ, Riemersma, RL, Gauthier, J, Mandemaker, LDB, Verhoeven, T, Hofmann, JP, Chan, K & Weckhuysen, BM 2019, 'Electrolyte effects on the stability of Ni-Mo cathodes for the hydrogen evolution reaction', ChemSusChem, vol. 12, no. 15, pp. 3491-3500. https://doi.org/10.1002/cssc.201900617

Electrolyte effects on the stability of Ni-Mo cathodes for the hydrogen evolution reaction. / Wijten, Jochem H.J. ; Riemersma, Romy L.; Gauthier, Joe; Mandemaker, Laurens D.B.; Verhoeven, Tiny; Hofmann, Jan Philipp; Chan, Karen; Weckhuysen, Bert M. (Corresponding author).

In: ChemSusChem, Vol. 12, No. 15, 08.08.2019, p. 3491-3500.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Electrolyte effects on the stability of Ni-Mo cathodes for the hydrogen evolution reaction

AU - Wijten, Jochem H.J.

AU - Riemersma, Romy L.

AU - Gauthier, Joe

AU - Mandemaker, Laurens D.B.

AU - Verhoeven, Tiny

AU - Hofmann, Jan Philipp

AU - Chan, Karen

AU - Weckhuysen, Bert M.

N1 - © 2019 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.

PY - 2019/8/8

Y1 - 2019/8/8

N2 - Water electrolysis to form hydrogen as a solar fuel requires highly effective catalysts. In this work, theoretical and experimental studies are performed on the activity and stability of Ni-Mo cathodes for this reaction. Density functional theory studies show various Ni-Mo facets to be active for the hydrogen evolution reaction, Ni segregation to be thermodynamically favorable, and Mo vacancy formation to be favorable even without an applied potential. Electrolyte effects on the long-term stability of Ni-Mo cathodes are determined. Ni-Mo is compared before and after up to 100 h of continuous operation. It is shown that Ni-Mo is unstable in alkaline media, owing to Mo leaching in the form of MoO 4 2- , ultimately leading to a decrease in absolute overpotential. It is found that the electrolyte, the alkali cations, and the pH all influence Mo leaching. Changing the cation in the electrolyte from Li to Na to K influences the surface segregation of Mo and pushes the reaction towards Mo dissolution. Decreasing the pH decreases the OH - concentration and in this manner inhibits Mo leaching. Of the electrolytes studied, in terms of stability, the best to use is LiOH at pH 13. Thus, a mechanism for Mo leaching is presented alongside ways to influence the stability and make the Ni-Mo material more viable for renewable energy storage in chemical bonds.

AB - Water electrolysis to form hydrogen as a solar fuel requires highly effective catalysts. In this work, theoretical and experimental studies are performed on the activity and stability of Ni-Mo cathodes for this reaction. Density functional theory studies show various Ni-Mo facets to be active for the hydrogen evolution reaction, Ni segregation to be thermodynamically favorable, and Mo vacancy formation to be favorable even without an applied potential. Electrolyte effects on the long-term stability of Ni-Mo cathodes are determined. Ni-Mo is compared before and after up to 100 h of continuous operation. It is shown that Ni-Mo is unstable in alkaline media, owing to Mo leaching in the form of MoO 4 2- , ultimately leading to a decrease in absolute overpotential. It is found that the electrolyte, the alkali cations, and the pH all influence Mo leaching. Changing the cation in the electrolyte from Li to Na to K influences the surface segregation of Mo and pushes the reaction towards Mo dissolution. Decreasing the pH decreases the OH - concentration and in this manner inhibits Mo leaching. Of the electrolytes studied, in terms of stability, the best to use is LiOH at pH 13. Thus, a mechanism for Mo leaching is presented alongside ways to influence the stability and make the Ni-Mo material more viable for renewable energy storage in chemical bonds.

KW - electrocatalysis

KW - electrodes

KW - electrolytes

KW - solar fuels

KW - water splitting

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U2 - 10.1002/cssc.201900617

DO - 10.1002/cssc.201900617

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