Challenging the Durability of Intermetallic Mo–Ni Compounds in the Hydrogen Evolution Reaction
| Autor: | Igor Veremchuk, Holger Schwarz, Ridha Zerdoumi, Thomas Seyller, Leonard Rößner, Marc Armbrüster |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Hydrogen Intermetallic chemistry.chemical_element 02 engineering and technology Crystal structure 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Catalysis Nickel chemistry Chemical engineering Molybdenum Specific surface area General Materials Science Leaching (metallurgy) 0210 nano-technology |
| Zdroj: | ACS Applied Materials & Interfaces. 13:23616-23626 |
| ISSN: | 1944-8252 1944-8244 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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