Electrochemical Hydrogen Evolution at Ordered Mo7Ni7
| Autor: | Francis J. DiSalvo, Héctor D. Abruña, Catherine R. Mulzer, James R. McKone, William R. Dichtel, Peter M. Csernica |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Alloy Inorganic chemistry Intermetallic 02 engineering and technology General Chemistry engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry Electrocatalyst 01 natural sciences Catalysis Pseudocapacitance 0104 chemical sciences Dielectric spectroscopy Adsorption engineering 0210 nano-technology |
| Zdroj: | ACS Catalysis. 7:3375-3383 |
| ISSN: | 2155-5435 |
| Popis: | Ni–Mo alloys containing up to ∼15 mol % Mo are excellent non-noble electrocatalysts for the hydrogen evolution reaction (HER) in alkaline aqueous electrolytes. To date, studies have not addressed the details of HER activity of ordered Ni–Mo intermetallic compounds, which can contain a significantly larger fraction of Mo (up to 50 mol %) than can be accessed through high-temperature alloying. Here, we present a straightforward and facile synthesis of three phase-pure electrocatalyst powders using a precipitation–reduction approach: ordered Mo7Ni7, disordered Ni0.92Mo0.08, and pure Ni. The Ni0.92Mo0.08 alloy exhibited a nearly 10-fold higher mass-specific HER activity than either pure Ni or Mo7Ni7, where much of the difference could be attributed to relative surface area. Therefore, we attempted to quantify and account for differences in surface areas using electron microscopy, impedance spectroscopy, and gas adsorption measurements. These data suggest that Ni–Mo alloys and intermetallic compounds exhibit s... |
| Databáze: | OpenAIRE |
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