Abstract
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 candi-dates.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 nan-otube/reduced graphene oxide(P-CNT/rGO)aerogel cathode is synthesized through a synergistic modi-fication 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 capac-itance and superb ions transport performance.The as-assembled ZHC based on P-CNT/rGO cathode deliv-ers 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.
基金项目
Distinguished Young Scientists of Hunan Province(2022JJ10024)
国家自然科学基金(21601057)
湖南省自然科学基金(2021JJ30216)
Key Projects of Hunan Provincial Education Department(22A0412)
维普
万方数据