过电位
催化作用
分解水
析氧
氢氧化物
材料科学
电化学
镍
化学工程
电子转移
电解质
无机化学
化学
电极
光化学
物理化学
光催化
生物化学
工程类
冶金
作者
Ziyi Wan,Ping Tang,Luwei Dai,Yao Yang,Lu Li,Jun Liu,Min Yang,Guowei Deng
出处
期刊:C
[Multidisciplinary Digital Publishing Institute]
日期:2023-10-03
卷期号:9 (4): 94-94
被引量:4
摘要
A reasonable design of nickel-based catalysts is key to efficient and sustainable energy conversion. For electrocatalytic materials in alkaline electrolytes, however, atomic-level control of the active sites is essential. Moreover, the well-defined surface structure contributes to a deeper understanding of the catalytic mechanism. Here, we report the loading of defective nickel–cobalt layered double hydroxide nanosheets (Ni2Co-LDH@C) after carbonization of silk. Under the precise regulation of the local coordination environment of the catalytic active site and the presence of defects, Ni2Co-LDH@C can provide an ultra-low overpotential of 164.8 mV for hydrogen evolution reactions (HERs) at 10 mA cm−2, exceeding that of commercial Pt/C catalysts. Density functional theory calculations show that Ni2Co-LDH@C optimizes the adsorption energy of the intermediate and promotes the O-O coupling of the active site in the oxygen evolution reaction. When using Ni2Co-LDH@Cs as cathodes and anodes to achieve overall water splitting, a low voltage of 1.63 V is required to achieve a current density of 10 mA cm−2. As an ideal model, Ni2Co-LDH@C has excellent water splitting properties and has the potential to develop water–alkali electrocatalysts.
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