Novel Bilayer-Shelled N,O-Doped Hollow Porous Carbon Microspheres as High Performance Anode for Potassium-Ion Hybrid Capacitors  

作　　者：Zhen Pan Yong Qian Yang Li Xiaoning Xie Ning Lin Yitai Qian 

机构地区：[1]Department of Applied Chemistry,University of Science and Technology of China,Hefei 230026,People’s Republic of China [2]Yongjiang Laboratory,Ningbo 315202,People’s Republic of China [3]China National Building Material Design&Research Institute Co.,Ltd.,No.208,Huazhong Road,Gongshu District,Hangzhou 310022,People’s Republic of China

出　　处：《Nano-Micro Letters》2023年第9期423-435,共13页纳微快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.21701163,21671181,21831006,and 22075268);the Fundamental Research Funds for the Central Universities(No.WK5290000003);Innovation Key Fund Project of University of Science and Technology of China(YD2060002023).

摘　　要：With the advantages of high energy/power density,long cycling life and low cost,dual-carbon potassium ion hybrid capacitors(PIHCs)have great potential in the field of energy storage.Here,a novel bilayer-shelled N,O-doped hollow porous carbon microspheres(NOHPC)anode has been prepared by a self-template method,which is consisted of a dense thin shell and a hollow porous spherical core.Excitingly,the NOHPC anode possesses a high K-storage capacity of 325.9 mA h g^(−1)at 0.1 A g^(−1)and a capacity of 201.1 mAh g^(−1)at 5 A g^(−1)after 6000 cycles.In combination with ex situ characterizations and density functional theory calculations,the high reversible capacity has been demonstrated to be attributed to the co-doping of N/O heteroatoms and porous structure improved K+adsorption and intercalation capabilities,and the stable long-cycling performance originating from the bilayer-shelled hollow porous carbon sphere structure.Meanwhile,the hollow porous activated carbon microspheres(HPAC)cathode with a high specific surface area(1472.65 m^(2)g^(−1))deriving from etching NOHPC with KOH,contributing to a high electrochemical adsorption capacity of 71.2 mAh g^(−1)at 1 A g^(−1).Notably,the NOHPC//HPAC PIHC delivers a high energy density of 90.1 Wh kg^(−1)at a power density of 939.6 W kg^(−1)after 6000 consecutive charge-discharge cycles.

关 键 词：Self-template method Bilayer-shelled hollow porous structure N O-doped carbon microspheres Dual-carbon potassium‐ion hybrid capacitor 

分 类 号：TQ127.11[化学工程—无机化工] TM53[电气工程—电器]