纳米片
双金属片
材料科学
催化作用
碳化物
化学工程
纳米技术
电催化剂
电化学
过电位
化学
冶金
无机化学
电极
金属
工程类
有机化学
物理化学
作者
Xiaozhong Zheng,Yuzhuo Chen,Xiaoguang Bao,Shanjun Mao,Ruxue Fan,Yong Wang
出处
期刊:ACS Catalysis
日期:2020-09-10
卷期号:10 (19): 11634-11642
被引量:65
标识
DOI:10.1021/acscatal.0c03355
摘要
Water electrolysis is a promising technique to produce high-quality hydrogen. However, the design and synthesis of high-performance nonprecious metal catalysts for the hydrogen evolution reaction are still confronted with challenges because of their high overpotential and poor flexibility. We herein reported in situ formed bimetallic carbide Ni6Mo6C nanodot and NiMoOx nanosheet array hybrid electrocatalyst supported on activated carbon cloth (Ni6Mo6C/NiMoOx/ACC), which is manufactured by controlling the diffusion of carbon atoms into precursor NiMoO4 nanosheets from activated carbon cloth to produce active species bimetallic carbide during annealing in a H2 atmosphere. The unique hierarchical structure of NiMoOx nanosheet arrays grown on ACC could significantly promote both mass transport and electric conductivity, and the embedded Ni6Mo6C with moderated hydrogen adsorption ability (ΔGH* = −0.13 eV) and low water dissociation barrier (ΔGb = 0.27 eV) exhibited remarkable performance and durability for the hydrogen evolution reaction (HER). Optimal Ni6Mo6C/NiMoOx/ACC demonstrates zero onset overpotential and an overpotential of only 29 mV at a current density of 10 mA cm–2 with long-term stability (60 h loss-free continuous operation) in 1.0 M KOH solution, even surpassing the benchmark Pt/C catalyst. Especially, the as-made electrocatalyst shows robust flexibility and its high electrocatalytic performance almost keeps constant under distorted states, thus meeting the requirements of flexible electrocatalysts such as bendability. These findings afford a new idea to integrally construct highly efficient flexible electrocatalysts.
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