Self- supported high-entropy alloy electrocatalyst for highly efficient H2 evolution in acid condition
| Autor: | Wei Ji, Long Zhang, Junfeng Gu, Zhengyi Fu, Heng Wang, Mingming Zhao, Yuchen Sun, Peiyan Ma |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Alloy Spark plasma sintering 02 engineering and technology Electrolyte Overpotential engineering.material 010402 general chemistry Electrocatalyst 01 natural sciences lcsh:TA401-492 High-entropy alloy Hydrogen production Tafel equation Acidic electrolyte Metals and Alloys Electrocatalysts 021001 nanoscience & nanotechnology Hydrogen evolution reaction 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Chemical engineering engineering lcsh:Materials of engineering and construction. Mechanics of materials Cyclic voltammetry 0210 nano-technology Stability |
| Zdroj: | Journal of Materiomics, Vol 6, Iss 4, Pp 736-742 (2020) |
| ISSN: | 2352-8478 |
| Popis: | Developing non-precious catalysts as Pt substitutes for electrochemical hydrogen evolution reaction (HER) with superior stability in acidic electrolyte is of critical importance for large-scale, low-cost hydrogen production from water. Herein, we report a CoCrFeNiAl high-entropy alloy (HEA) electrocatalyst with self-supported structure synthesized by mechanical alloying and spark plasma sintering (SPS) consolidation. The HEA after HF treatment and in situ electrochemical activation for 4000 cycles of cyclic voltammetry (HF-HEAa2) presents favourable activity with overpotential of 73 mV to reach a current density of 10 mA cm−2 and a Tafel slope of 39.7 mV dec−1. The alloy effect of Al/Cr with Co/Fe/Ni at atomic level, high-temperature crystallization, as well as consolidation by SPS endow CoCrFeNiAl HEA with high stability in 0.5 M H2SO4 solution. The superior performance of HF-HEAa2 is related with the presence of metal hydroxides/oxides groups on HEA. |
| Databáze: | OpenAIRE |
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