Selenization triggers deep reconstruction to produce ultrathin γ-NiOOH toward the efficient water oxidation  

作　　者：Kailu Guo Hua Li Junfeng Huang Yantao Wang Yong Peng Siyu Lu Cailing Xu 

机构地区：[1]State Key Laboratory of Applied Organic Chemistry,Laboratory of Special Function Materials and Structure Design of the Ministry of Education,College of Chemistry and Chemical Engineering,Lanzhou University,Lanzhou 730000,Gansu,China [2]School of Materials and Energy,Lanzhou University,Lanzhou 730000,Gansu,China [3]Green Catalysis Center,College of Chemistry,Zhengzhou University,Zhengzhou 450000,Henan,China

出　　处：《Journal of Energy Chemistry》2021年第12期651-658,I0015,共9页能源化学（英文版）

基　　金：supported by the grants from the Natural Science Foundation of China (22072062)。

摘　　要：Transition metal chalcogenides will be in situ transformed into metal oxyhydroxides during oxygen evolution reaction(OER) process in alkaline medium.However,most of these compounds only undergo surface reconstruction under operating conditions,which contains a large percentage of inactive atoms in the core,thus limiting the exposure of the active sites.Here,we synthesize a Ni-Mo-Se precatalyst with three-dimensional hierarchical structure and develop a facile on-site electrochemical activation strategy for achieving deep reconstruction of the precatalyst.Using the combination of multiple spectroscopic characterizations and high resolution electron microscopy techniques,we unravel that the Ni-Mo-Se precatalyst is deeply reconstructed into γ-NiOOH with co-leaching of Mo and Se after the anodic oxidation.Such flower-like γ-NiOOH is constituted by distorted ultrathin nanosheets with a thickness of ~4.5 nm and contains abundant intercalated species such as water and OH^(-)/CO_(3)^(2-) thus offering a large quantity of accessible active sites.To reach the current density of 10 mA cm^(-2),the derived electrode requires an overpotential of only 244 mV,outperforming almost all the reported analogues.This work highlights the reconstruction chemistry and provides a simple method for the preparation of efficient OER electrocatalyst.

关 键 词：Electrocatalyst Deep reconstruction NIOOH Ni-Mo-Se Oxygen evolution reaction 

分 类 号：TQ426[化学工程]