Challenging the Durability of Intermetallic Mo–Ni Compounds in the Hydrogen Evolution Reaction
- Leonard RößnerLeonard RößnerProfessur Materialien für innovative Energiekonzepte, Chemnitz University of Technology, Straße der Nationen 62, 09111 Chemnitz, GermanyMore by Leonard Rößner,
- Holger SchwarzHolger SchwarzProfessur Experimentalphysik mit Schwerpunkt Technische Physik, Chemnitz University of Technology, Straße der Nationen 62, 09111 Chemnitz, GermanyMore by Holger Schwarz,
- Igor VeremchukIgor VeremchukChemische Metallkunde, Max-Planck Institute für Chemische Physik fester Stoffe, Nöthnitzer Str. 40, 01187 Dresden, GermanyMore by Igor Veremchuk,
- Ridha ZerdoumiRidha ZerdoumiProfessur Materialien für innovative Energiekonzepte, Chemnitz University of Technology, Straße der Nationen 62, 09111 Chemnitz, GermanyMore by Ridha Zerdoumi,
- Thomas SeyllerThomas SeyllerProfessur Experimentalphysik mit Schwerpunkt Technische Physik, Chemnitz University of Technology, Straße der Nationen 62, 09111 Chemnitz, GermanyMore by Thomas Seyller, and
- Marc Armbrüster*Marc Armbrüster*Email: [email protected]Professur Materialien für innovative Energiekonzepte, Chemnitz University of Technology, Straße der Nationen 62, 09111 Chemnitz, GermanyMore by Marc Armbrüster
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.
Cited By
This article has not yet been cited by other publications.