Enhanced rate and specific capacity in nanorod-like core-shell crystalline NiMoO_(4)@amorphous cobalt boride materials enabled by Mott-Schottky heterostructure as positive electrode for hybrid supercapacitors  

作　　者：Jing-Feng Hou Jian-Fei Gao Ling-Bin Kong 

机构地区：[1]State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Lanzhou 730050,Gansu,China [2]School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,Gansu,China

出　　处：《Journal of Energy Chemistry》2023年第10期276-287,I0009,共13页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(52261040,51971104);the Outstanding Postgraduate Innovation Star Project of Gansu Provincial Department of Education(2022CXZX-383)。

摘　　要：The supercapacitor electrode materials suffer from structure pulverization and sluggish electrode kinetics under high current rates.Herein,a unique NiMoO_(4)@Co-B heterostructure composed of highly conductive Co-B nanoflakes and a semiconductive NiMoO_(4) nanorod is designed as an electrode material to exert the energy storage effect on supercapacitors.The formed Mott-Schottky heterostructure is helpful to overcome the ion diffusion barrier and charge transfer resistance during charging and discharging.Moreover,this crystalline-amorphous heterogeneous phase could provide additional ion storage sites and better strain adaptability.Remarkably,the optimized NiMoO_(4)@Co-B hierarchical nanorods(the mass ratio of NiMoO_(4)/Co-B is 3:1)present greatly enhanced electrochemical characteristics compared with other components,and show superior specific capacity of 236.2 mA h g^(-1)at the current density of 0.5 A g^(-1),as well as remarked rate capability.The present work broadens the horizons of advanced electrode design with distinct heterogeneous interface in other energy storage and conversion field.

关 键 词：Crystalline-amorphous heterophase Mott-Schottky heterostructure Energy storage Nickel molybdate 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TM53[电气工程—电器]