Phosphorous-doped carbon nanotube/reduced graphene oxide aerogel cathode enabled by pseudocapacitance for high energy and power zinc-ion hybrid capacitors  

作　　者：Junjun Yao Fuzhi Li Ruyi Zhou Chenchen Guo Xinru Liu Yirong Zhu 

机构地区：[1]Hunan Key Laboratory of Green Metallurgy and New Energy Materials,College of Materials and Advanced Manufacturing,Hunan University of Technology,Zhuzhou 412007,China [2]College of packaging and Material Engineering,Hunan University of Technology,Zhuzhou 412007,China

出　　处：《Chinese Chemical Letters》2024年第2期570-576,共7页中国化学快报（英文版）

基　　金：financially supported by Distinguished Young Scientists of Hunan Province(No.2022JJ10024);National Natural Science Foundation of China(No.21601057);Natural Science Foundation of Hunan Province(No.2021JJ30216);Key Projects of Hunan Provincial Education Department(No.22A0412).

摘　　要：The design and development of energy storage device with high energy/power density has become a research hotspot.Zinc-ion hybrid capacitors(ZHCs)are considered as one of the most promising candidates.However,the application of ZHCs is hindered by their low energy density at high power density due to the unsatisfactory cathode material.In this study,a novel 3D phosphorus-doped carbon nanotube/reduced graphene oxide(P-CNT/rGO)aerogel cathode is synthesized through a synergistic modification strategy of CNT insertion and P doping modification combined with 3D porous design.The as-obtained P-CNT/rGO aerogel cathode manifests significantly increased surface aera,expanded interlayer spacing,and enhanced pseudocapacitance behavior,thus leading to significantly enhanced specific capacitance and superb ions transport performance.The as-assembled ZHC based on P-CNT/rGO cathode delivers a superior energy density of 42.2 Wh/kg at an extreme-high power density of 80 kW/kg and excellent cycle life.In-depth kinetic analyses are undertaken to prove the enhanced pseudocapacitance behavior and exceptional power output capability of ZHCs.Furthermore,the reaction mechanism of physical and chemical adsorption/desorption of electrolyte ions on the P-CNT/rGO cathode is revealed by systematic ex-situ characterizations.This work can provide a valuable reference for developing advanced graphene-based cathode for high energy/power density ZHCs.

关 键 词：Graphene aerogel Phosphorus doping PSEUDOCAPACITANCE Zinc-ion hybrid capacitors Energy storage mechanism 

分 类 号：TM53[电气工程—电器] TQ427.26[化学工程]