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  Challenging the Durability of Intermetallic Mo-Ni Compounds in the Hydrogen Evolution Reaction

Rößner, L., Schwarz, H., Veremchuk, I., Zerdoumi, R., Seyller, T., & Armbrüster, M. (2021). Challenging the Durability of Intermetallic Mo-Ni Compounds in the Hydrogen Evolution Reaction. ACS Applied Materials and Interfaces, 13(20), 23616-23626. doi:10.1021/acsami.1c02169.

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 Creators:
Rößner, Leonard1, Author
Schwarz, Holger1, Author
Veremchuk, Igor2, Author              
Zerdoumi, Ridha1, Author
Seyller, Thomas1, Author
Armbrüster, Marc1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Igor Veremchuk, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863411              

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Free keywords: hydrogen evolution, intermetallic compound, Mo7Ni7, molybdenum, MoNi3, MoNi4, nickel, Binary alloys, Crystal structure, Durability, Hydrogen, Hydrogen evolution reaction, Intermetallics, Molybdenum compounds, Specific surface area, 2 layer, Accelerated durability tests, Alkaline media, Crystallographic ordering, Intrinsic instability, Ni electrodes, Single phase, Nickel compounds
 Abstract: Molybdenum-nickel materials are catalysts of industrial interest for the hydrogen evolution reaction (HER). Well-characterized surfaces of the single-phase intermetallic compounds Ni7Mo7, Ni3Mo, and Ni4Mo were subjected to accelerated durability tests (ADTs) and thorough characterization to unravel whether crystallographic ordering affects the activity. Their intrinsic instability leads to molybdenum leaching, resulting in higher specific surface areas and nickel-enriched surfaces. These are more prone to form Ni(OH)2 layers, which leads to deactivation of the Mo-Ni materials. The crystal structure of the intermetallic compounds has, due to the intrinsic instability of the materials in alkaline media, no effect on the activity. Ni7Mo7, identified earlier as durable, proves to be highly unstable in the applied ADTs. The results show that the enhanced activity of unsupported bulk Mo-Ni electrodes can solely be ascribed to increased specific surface areas. © 2021 The Authors. Published by American Chemical Society.

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Language(s): eng - English
 Dates: 2021-05-122021-05-12
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1021/acsami.1c02169
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Title: ACS Applied Materials and Interfaces
  Other : ACS Applied Materials & Interfaces
  Abbreviation : ACS Appl. Mater. Interfaces
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: 13 (20) Sequence Number: - Start / End Page: 23616 - 23626 Identifier: ISSN: 1944-8244
CoNE: https://pure.mpg.de/cone/journals/resource/1944-8244