Ultrathin Metal Silicate Hydroxide Nanosheets with Moderate Metal-Oxygen Covalency Enables Efficient Oxygen Evolution  

作　　者：Jiexin Zhu Shikun Li Zechao Zhuang Shan Gao Xufeng Hong Xuelei Pan Ruohan Yu Liang Zhou Lyudmila V.Moskaleva Liqiang Mai 

机构地区：[1]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology [2]Institute of Applied and Physical Chemistry and Center for Environmental Research and Sustainable Technology, University of Bremen [3]Department of Chemistry, University of the Free State [4]Collage of Chemistry & Chemical Engineering, Anhui University [5]Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory, Xianhu Hydrogen Valley,foshan guangdong 528200,china

出　　处：《Energy & Environmental Materials》2022年第1期231-237,共7页能源与环境材料（英文）

基　　金：supported by the NationallNaturallScience Foundation of China(51832004,51521001,51872218);the NationallKey Research and Development Program of China(2016YFA0202603);the Programme of Introducing Talents of Discipline to Universities(B17034);the Yellow Crane Talent(Science&Technology)Program of Wuhan City;Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory(XHT2020-003);the FundamentallResearch Funds for the CentrallUniversities(195101005)。

摘　　要：Exploring efficient,cost-effective,and durable electrocatalysts for electrochemical oxygen evolution reaction(OER)is pivotal for the large-scale application of water electrolysis.Recent advance has demonstrated that the activity of electrocatalysts exhibits a strong dependence on the surface electronic structure.Herein,a series of ultrathin metal silicate hydroxide nanosheets(UMSHNs)M_(3)Si_(2)O_(5)(OH)_(4)(M=Fe,Co,and Ni)synthesized without surfactant are introduced as highly active OER electrocatalysts.Cobalt silicate hydroxide nanosheets show an optimal OER activity with overpotentials of 287 and 358 m V at 1 and 10 m A cm^(-2),respectively.Combining experimental and theoretical studies,it is found that the OER activity of UMSHNs is dominated by the metal-oxygen covalency(MOC).High OER activity can be achieved by having a moderate MOC as reflected by aσ^(*)-orbital(e_(g))filling near unity and moderate[3d]/[2p]ratio.Moreover,the UMSHNs exhibit favorable chemical stability under oxidation potential.This contribution provides a scientific guidance for further development of active metal silicate hydroxide catalysts.

关 键 词：electrocatalysis metal silicate hydroxide metal-oxygen covalency oxygen evolution reaction ultrathin nanosheet 

分 类 号：TQ426[化学工程] TB383.1[一般工业技术—材料科学与工程]