Structurally ordered intermetallic Ir3V electrocatalysts for alkaline hydrogen evolution reaction
| Autor: | Xu Guo, Hai-Wei Liang, Le-Le Zhang, Qunxiang Li, Lin-Wei Chen, Ru-Yang Shao, Qiang-Qiang Yan |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Inorganic chemistry Intermetallic chemistry.chemical_element 02 engineering and technology Electrolyte Overpotential 010402 general chemistry 021001 nanoscience & nanotechnology Electrocatalyst 01 natural sciences Dissociation (chemistry) 0104 chemical sciences Catalysis chemistry General Materials Science Electrical and Electronic Engineering 0210 nano-technology Platinum Bimetallic strip |
| Zdroj: | Nano Energy. 81:105636 |
| ISSN: | 2211-2855 |
| DOI: | 10.1016/j.nanoen.2020.105636 |
| Popis: | Electrocatalysis of hydrogen evolution reaction (HER) in alkaline media is critical for the practical implementation of economical water-alkali electrolyzers. However, the sluggish water dissociation kinetics even on platinum-based electrocatalysts result in poor hydrogen-production activities. Here we report a structurally ordered Ir3V catalyst for efficiently catalyzing HER in alkaline media. The ordered Ir3V catalyst exhibits a low overpotential of 9.0 mV at 10 mA cm−2 in 1.0 M KOH electrolyte with Ir loading of 19 µg cm−2, corresponding a mass activity of 1200 A gIr−1 at the overpotential of 20 mV, which is 6.7, 9.4, and 3.3 times greater than that of the commercial Pt/C, Ir/C, and disordered Ir3V catalysts. The enhanced HER kinetics is ascribed to the charge redistribution on the ordered Ir3V surface with the maximized number of neighboring bimetallic Ir/V sites compared to the disordered solid solution counterpart, which promotes the water dissociation on the electron-deficient V sites. |
| Databáze: | OpenAIRE |
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