Interlayer ligand engineering of β-Ni(OH)2 for oxygen evolution reaction  

作　　者：Junying He Yuqin Zou Yucheng Huang Chenhui Li Yanbo Liu Ling Zhou Chung-Li Dong Xia Lu Shuangyin Wang 

机构地区：[1]State Key Laboratory of Chem/Bio-Sensing and Chemometrics,College of Chemistry and Chemical Engineering,Hunan University,Changsha 410082,China [2]Department of Physics,Tamkang University,New Taipei City 25137,China [3]School of Materials,Sun Yat-sen University,Guangzhou 510275,China

出　　处：《Science China Chemistry》2020年第11期1684-1693,共10页中国科学（化学英文版）

基　　金：This work was supported by the Fundamental Research Funds for the Central Universities(531107051102);the National Natural Science Foundation of China(51402100,21825201,21573066,21805080,21902047);the Provincial Natural Science Foundation of Hunan(2016TP1009,2020JJ5045).

摘　　要：Oxygen evolution reaction(OER)is a bottleneck process for many electrochemical devices due to the sluggish kinetics,for which advanced electrocatalysts should be carefully designed.Nickle-based materials have been extensively studied to catalyze OER.However,their performances are still below the expectation and the active sites are often controversial.Herein,we have successfully modulated the electronic and surface properties of layeredβ-Ni(OH)2 by the interlayer ligand engineering,aiming to design novel efficient electrocatalysts and unveil the catalysis mechanism.By one-step solvothermal reaction,alkoxyl substitutedβ-Ni(OH)2 with variable interlayer distances is obtained,and the ethoxyl substituted one(NiEt)shows great potential for efficient OER.With the assistance of powder X-ray diffraction and crystalline structure computational simulation,the formula of alkoxyl substitutedβ-Ni(OH)2 are determined.Operando X-ray absorption spectroscopy studies combined with ex-situ analyses revealed that the critical active species of NiEt is formed via hydroxylation and subsequent de-protonation,with high valent Niδ+(3<δ≤3.66).The corresponding catalytic reaction pathway and mechanism are proposed.

关 键 词：ALKOXYL SUBSTITUTION Β-NI(OH)2 oxygen evolution reaction OPERANDO 

分 类 号：O643.36[理学—物理化学]