催化作用
析氧
电解水
制氢
电解
碱性水电解
材料科学
分解水
电化学
化学工程
X射线光电子能谱
本体电解
氧化还原
拉曼光谱
纳米技术
化学
电极
电解质
冶金
物理化学
物理
工程类
光学
光催化
生物化学
作者
Jiao Liu,Wen Qiao,Zexuan Zhu,Jingguo Hu,Xiaoyong Xu
出处
期刊:Small
[Wiley]
日期:2022-07-01
卷期号:18 (30)
被引量:9
标识
DOI:10.1002/smll.202202434
摘要
Pre-catalyst reconstruction in electrochemical processes has recently attracted intensive attention with mechanistic potentials to uncover really active species and catalytic mechanisms and advance targeted catalyst designs. Here, nickel-molybdenum oxysulfide is deliberately fabricated as pre-catalyst to present a comprehensive study on reconstruction dynamics for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in alkali water electrolysis. Operando Raman spectroscopy together with X-ray photoelectron spectroscopy and electron microscopy capture dynamic reconstruction including geometric, component and phase evolutions, revealing a chameleon-like reconstruction self-adaptive to OER and HER demands under oxidative and reductive conditions, respectively. The in situ generated active NiOOH and Ni species with ultrafine and porous textures exhibit superior OER and HER performance, respectively, and an electrolyzer with such two reconstructed electrodes demonstrates steady overall water splitting with an extraordinary 80% electricity-to-hydrogen (ETH) energy conversion efficiency. This work highlights dynamic reconstruction adaptability to electrochemical conditions and develops an automatic avenue toward the targeted design of advanced catalysts.
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