塔菲尔方程
双金属片
纳米片
分解水
催化作用
材料科学
电极
化学工程
X射线光电子能谱
可逆氢电极
阴极
无机化学
纳米技术
金属
电化学
化学
工作电极
冶金
物理化学
工程类
光催化
生物化学
作者
Zhong Wu,Yanhui Feng,Zhenbo Qin,Xiaopeng Han,Xuerong Zheng,Yida Deng,Wenbin Hu
出处
期刊:Small
[Wiley]
日期:2022-02-20
卷期号:18 (43)
被引量:29
标识
DOI:10.1002/smll.202106904
摘要
Development of efficient non-noble metal catalysts for water splitting is of great significance but challenging due to the sluggish kinetics of the hydrogen evolution reaction (HER) in alkaline medium. Herein, a bimetallic multi-level layered catalytic electrode composed of Ni3 S2 nanosheets with secondary Co-NiOOH layer of 3D porous and free-standing cathode in alkaline medium is reported. This integrated synergistic catalytic electrode exhibits excellent HER electrocatalytic performance. The resultant Ni0.67 Co0.33 /Ni3 S2 @NF electrode displays the highest HER activity with only overpotentials of 87 and 203 mV to afford current densities of 10 and 100 mA·cm-2 , respectively, and its Tafel slope is 80 mV·dec-1 . The chronopotentiometry operated at high current density of 50 mA·cm-2 shows negligible deterioration, indicating better stability of Ni0.67 Co0.33 /Ni3 S2 @NF electrode than Pt/C (20 wt.%). Such a desirable catalytic performance is attributed to the modification of physical and electronic structure that exposes abundant active sites and improves the intrinsic catalytic activity toward HER, which is also confirmed by electrochemically active surface area and X-ray photoelectron spectroscopy analysis. This work provides a strong support for the rational design of high-performance bimetallic electrodes for industrial water splitting.
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