3D nitrogen and boron dual-doped carbon quantum dots/reduced graphene oxide aerogel for advanced aqueous and flexible quasi-solid-state zinc-ion hybrid capacitors  

作　　者：Jun-Jun Yao Chang Liu Jing-Ying Li Zhong-Liang Hu Ru-Yi Zhou Chen-Chen Guo Xin-Ru Liu Fei-Fan Yang Yi-Rong 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]School of Chemistry and Chemical Engineering,Hunan Institute of Engineering,Xiangtan,411104,China [3]National&Local Joint Engineering Research Center for Advanced Packaging Material and Technology,Hunan University of Technology,Zhuzhou,412007,China

出　　处：《Rare Metals》2023年第7期2307-2323,共17页稀有金属（英文版）

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

摘　　要：As prospective energy storage devices,zinc-ion hybrid capacitors(ZHCs)still suffer from unsatisfactory cathode materials.Herein,the three dimensional(3D)N,B dual-doped carbon quantum dots/reduced graphene oxide(N,B-CQDs/rGO)composite aerogel is prepared via a onepot hydrothermal method.Thanks to the synergism of CQDs modification and N,B dual-doping,the resultant N,B-CQDs/rGO composite aerogel delivers superior electrochemical properties.Furthermore,the as-obtained N,B-CQDs/rGO composite aerogel is served as a cathode for aqueous and flexible quasi-solid-state ZHCs for the first time.Impressively,the aqueous N,B-CQDs/rGO//Zn ZHC manifests a large energy density of 96.2 Wh·kg^(-1)at80 W·kg^(-1)and still remains a high energy density of 54.7Wh·kg^(-1)at a superb power density of 80 kW·kg^(-1).Meanwhile,kinetic analyses are employed to elucidate the prominent power performance,and various ex situ tests are undertaken to explore the energy storage mechanism of aqueous ZHC.More notably,the flexible quasi-solid-state N,B-CQDs/rGO//Zn ZHC displays a desirable energy density(89.1μWh·cm^(-2)),a superior power density(96,000μW·cm^(-2))and exceptional flexible performance.The present study offers a valuable reference for designing and developing advanced cathode materials for aqueous and flexible quasi-solid-state ZHCs.

关 键 词：Carbon quantum dots(CQDs) Graphene aerogel Heteroatom dual-doping Energy storage mechanism Zinc-ion hybrid capacitors(ZHCs) 

分 类 号：TQ427.26[化学工程] TM53[电气工程—电器]