A General Self-Sacrifice Template Strategy to 3D Heteroatom-Doped Macroporous Carbon for High-Performance Potassium-Ion Hybrid Capacitors  

作　　者：Junwei Li Xiang Hu Guobao Zhong Yangjie Liu Yaxin Ji Junxiang Chen Zhenhai Wen 

机构地区：[1]CAS Key Laboratory of Design and Assembly of Functional Nanostructures,and Fujian Provincial Key Laboratory of Nanomaterials,Fujian Institute of Research On the Structure of Matter,Chinese Academy of Sciences,Fuzhou,Fujian 350002,People’s Republic of China

出　　处：《Nano-Micro Letters》2021年第9期1-15,共15页纳微快报（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(Project No.21875253);CAS-Commonwealth Scientific and Industrial Research Organization(CSIRO)Joint Research Projects(121835KYSB20200039);Scientific Research and Equipment Development Project of CAS(YJKYYQ20190007).

摘　　要：Potassium-ion hybrid capacitors(PIHCs)tactfully combining capacitor-type cathode with battery-type anode have recently attracted increasing attentions due to their advantages of decent energy density,high power density,and low cost;the mismatches of capacity and kinetics between capacitor-type cathode and battery-type anode in PIHCs yet hinder their overall performance output.Herein,based on prediction of density functional theory calculations,we find Se/N co-doped porous carbon is a promising candidate for K+storage and thus develop a simple and universal self-sacrifice template method to fabricate Se and N co-doped three-dimensional(3D)macroporous carbon(Se/N-3DMpC),which features favorable properties of connective hier-archical pores,expanded interlayer structure,and rich activity site for boosting pseudocapacitive activity and kinetics toward K^(+)storage anode and enhancing capacitance performance for the reversible anion adsorption/desorption cath-ode.As expected,the as-assembled PIHCs full cell with a working voltage as high as 4.0 V delivers a high energy density of 186 Wh kg^(−1) and a power output of 8100 W kg^(−1) as well as excellent long service life.The proof-of-concept PIHCs with excellent performance open a new avenue for the development and application of high-performance hybrid capacitors.

关 键 词：Potassium-ion hybrid capacitors Self-sacrifice template Se/N co-doped 3D macroporous Long service life 

分 类 号：TM53[电气工程—电器]