过电位
塔菲尔方程
纳米孔
电催化剂
材料科学
无定形固体
析氧
化学工程
制氢
电化学
氢
铂金
氧气
非晶态金属
无机化学
纳米技术
催化作用
冶金
化学
电极
物理化学
结晶学
有机化学
合金
工程类
作者
Yabo Zhu,Weiji Dai,Tao Lü
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2020-01-10
卷期号:3 (2): 1319-1327
被引量:28
标识
DOI:10.1021/acsaem.9b01563
摘要
Electrochemical splitting of water to hydrogen is widely considered as an efficient and sustainable solution to relieve the energy crisis. In this work, we report a facile dealloying method based on metallic glass (Ni61Zr36Mo3) to introduce abundant oxygen vacancies (Ov) for the electrocatalytic hydrogen evolution reaction (HER). The corroded ribbons are composed of a sandwich-like structure with Ni–Mo–O nanoporous layer outside and raw metallic glass inside. This complex structure delivers a low overpotential of 71 ± 2.6 mV at −20 mA cm–2geo in 1.0 M KOH solution, a Tafel slope of 57 ± 3 mV dec–1, and 100 h long-term stability for HER, which is much better than those of the crystallized counterpart, nanoporous Ni, and the commercial benchmark 20% Pt/C electrocatalyst. The high concentration of oxygen vacancies (71.5%), the alloying effect of Mo, and amorphous composition synergistically contribute to the superior electrocatalytic ability and enhanced reaction kinetic of nanoporous Ni–Mo–O, indicating it an excellent low-cost alternative for platinum in hydrogen production.
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