过电位
无定形固体
材料科学
催化作用
析氧
氢氧化物
化学工程
基质(水族馆)
无定形碳
纳米技术
电极
结晶学
物理化学
化学
有机化学
电化学
海洋学
工程类
地质学
作者
Hanqing Gao,Wei Sun,Xinlong Tian,Jianjun Liao,Chenglong Ma,Yuling Hu,Gan Du,Ji Yang,Chengjun Ge
标识
DOI:10.1021/acsami.1c25115
摘要
Efficient and stable electrocatalytic water splitting plays a critical role in energy storage and conversion but is strongly restricted by the low activity and stability of catalysts associated with the complicated oxygen evolution reaction (OER). This work provides a strategy to fabricate an advanced NiFe-based catalyst to steadily speed up the OER based on a strong amorphous-amorphous coupling effect generated through amorphous CuS that induces the formation of amorphous NiFe layered double hydroxide (LDH) nanosheets (A-NiFe NS/CuS). The presence of the strong coupling effect not only modifies the electronic structure of catalytic sites to accelerate the reaction kinetics but also enhances the binding between the catalyst and substrate to strengthen the durability. In comparison to well-grown core-shell crystalline NiFe LDH on CuO, the as-synthesized amorphous A-NiFe NS/CuS gives a low overpotential of 240 mV to achieve 100 mA cm-2 and shows robust stability under 100 h of operation at the same current density. Therefore, amorphous-amorphous coupling between catalyst-substrate by elaborate and rational engineering yields an opportunity to design efficient and robust NiFe-based OER catalysts.
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