Halogen chlorine triggered oxygen vacancy-rich Ni(OH)_(2) with enhanced reaction kinetics for pseudocapacitive energy storage  

作　　者：Jiangyu Hao Lijin Yan Liang Luo Qiaohui Liu Youcun Bai Yuying Han Yang Zhou Xuefeng Zou Bin Xiang 

机构地区：[1]School of Chemistry and Chemical Engineering,Chongqing University,Chongqing 400044,China [2]Analytical and Testing Center,Chongqing University,Chongqing 400044,China [3]Guizhou Provincial Key Laboratory of Computational Nano-Material Science,Guizhou Education University,Guiyang 550018,Guizhou,China [4]School of Materials Science and Engineering,Institute of Materials Science and Device,Suzhou University of Science and Technology,Suzhou 215009,Jiangsu,China

出　　处：《Journal of Energy Chemistry》2023年第7期296-306,I0007,共12页能源化学（英文版）

基　　金：supported by the Opening Project of State Key Laboratory of Advanced Chemical Power Sources;the Guizhou Provincial Science and Technology Projects(QKHJC-ZK[2021]YB057);the Growth Project of Young Scientific and Technological Talents in Colleges and Universities of Guizhou Province(QKHJCKYZ[2021]252);the Reward and Subsidy Fund Project of Guizhou Education University(Z20210108)。

摘　　要：Two-dimensional (2D)Ni(OH)_(2) nanosheets can theoretically expose their active sites of 100%.Whereas,their intrinsic easy accumulation and low conductivity lead to weak and unsustainable reaction kinetics.Herein,we propose a novel halogen chlorine-triggered electrochemical etching strategy to controllably manage the reaction kinetics of 2D Ni(OH)_(2) nanosheets(EE/Cl-Ni(OH)_(2)).It is found that halogen chlorine doping can adjust the interlamellar spacing flexibly and promote the lattice oxygen activation to achieve controlled construction of superficial oxygen defects at the adjustable voltage.The optimal EE/Cl-Ni(OH)_(2) electrode exhibits a high rate capability and excellent specific capacity of 206.9 mA h g^(-1) at 1 A g^(-1) in a three-electrode system,which is more than twice as high as the pristine Ni(OH)_(2).Furthermore,EE/Cl-Ni(OH)_(2) cathode and FeOOH@rGO anode are employed for developing an aqueous Ni-Fe battery with an excellent energy density of 83 W h kg^(-1),a high power density of 17051 W kg^(-1),and robust durability over 20,000 cycles.This strategy exploits a fresh channel for the ingenious fabrication of highefficiency and stable nickel-based deficiency materials for energy storage.

关 键 词：Ni(OH)_(2) Electrochemical etching Lattice defects High energy density Ni-Fe battery 

分 类 号：TM91[电气工程—电力电子与电力传动] TB383.1[一般工业技术—材料科学与工程]