Three-dimensional CoMoMg nanomesh based on the nanoscale Kirkendall effect for the efficient hydrogen evolution reaction
| Autor: | Zhibin Zheng, Xuetao Yuan, Duosheng Li, Lixin Pei, Zhiguo Ye, Xinyuan Peng |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Hydrogen Kirkendall effect Electrolysis of water Nanoporous Mechanical Engineering Metals and Alloys Intermetallic chemistry.chemical_element Nanotechnology 02 engineering and technology Overpotential 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Nanomesh chemistry Mechanics of Materials Materials Chemistry 0210 nano-technology Current density |
| Zdroj: | Journal of Alloys and Compounds. 857:158086 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2020.158086 |
| Popis: | The conversion of excess electrical energy in a power system to hydrogen through the use of water electrolysis is considered an effective alternative to replace fossil fuels. However, the scarcity and high cost of Pt-based materials for the hydrogen evolution reaction (HER) impedes their large-scale application in electric power systems. On the basis of the nanoscale Kirkendall effect, three-dimensional CoMoMg nanomeshes are fabricated by a conventional high-temperature sintering method. The nanomesh CoMoMg alloy mainly consists of intermetallic Co3Mo, which achieves a low overpotential of 36 mV at a current density of 10 mA cm−2 in 1 M KOH. The electrode during a 60,000 s HER process under different current densities, especially 2 A cm−2, displays excellent long-term stability without compromising electrocatalytic activity, which is attributed to the synergistic effect between Co and Mo and three-dimensional nanoporous structure. This work provides a feasible strategy for designing efficient and durable hydrogen evolution electrocatalysts, and effectively solves the problem of expensive Pt-based precious metal catalysts. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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