Fast charge transport motivated by tunable Mo2C/Mo2N high-quality heterointerface for superior pseudocapacitive storage  

作　　者：Yanjun Gao Shaohua Zhang Lingrui Xu Xiangyang Li Lijie Li Lixia Bao Jiong Peng Xin Li 

机构地区：[1]School of Chemistry and Chemical Engineering,Beijing Institute of Technology,Beijing 100081,China [2]School of Material Science and Engineering,Beijing Institute of Technology,Beijing 100081,China [3]Analysis&Testing Center,Beijing Institute of Technology,Beijing 100081,China

出　　处：《Journal of Energy Chemistry》2023年第8期465-477,I0012,共14页能源化学（英文版）

基　　金：supported by the Beijing Natural Science Founding (2202050);the Beijing Institute of Technology scientific cooperation project (BITBLR2020010);the National Nature Science Foundation of China (21111120074);the National Nature Science Foundation of China (20806008)。

摘　　要：The development of potential transition-metal carbide/nitride heterojunctions is hindered by overall understanding and precise modulation for heterointerface effects.Herein,we demonstrate that Mo_(2)C/Mo_(2)N heterojunction with the precisely regulated high-quality interface can achieve marvelous rate performance and energy output via enlarging the interface-effect range and maximizing "accelerated charge" amount The heterointerface mechanism improving properties is synergistically revealed from kinetics and thermodynamics perspectives.Kinetics analysis confirms that the self-built electric field affords a robust force to drive rapid interface electrons/ions migration.The small adsorption energy,high density of states and quite low diffusion barrier thermodynamically enhance the electrochemical reaction dynamics on heterointerface.Consequently,the almost optimal performance of ultrahigh capacitance retention(85.6% even at 10 A g^(-1)) and pronounced energy output(96.4 Wh kg^(-1))in hybridsupercapacitors than other Mo_(2)C/Mo_(2)N-based materials is presented.This work gives new insight into the energy storage mechanism of heterojunction and guides the design of advanced electrodes.

关 键 词：Energy storage Hybrid supercapacitors PSEUDOCAPACITANCE HETEROJUNCTION High-quality interface 

分 类 号：TM53[电气工程—电器]