Fei Xu1, Yuqian Qiu1, Guangshen Jiang1, Baichuan Ding1, Jingyuan Li2, Qianhui Liu1, Jian Wu1, Xiaosa Xu1, Hongqiang Wang1, Yeru Liang3
1State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU), Xi'an 710072, China
2Department of Orthopaedics, Shaanxi Provincial People's Hospital, The Affiliated Hospital of Northwestern Polytechnical University, Xi'an, 710068 China
3College of Materials and Energy, South China Agricultural University, Guangzhou 510642, China
Tóm tắt
AbstractUnderstanding correlation between the nanostructure of porous carbons and their ion transport behavior is critical for achieving high‐performance supercapacitors. Herein, the relationship between size and shell thickness of carbon nanospheres (CNSs) and capacitive electrochemical performance is clarified. Structural uniform CNSs with controlled diameters, prepared via template‐free interfacial copolymerization, are emerging as an ideal platform for investigating the ion transport behavior. It is found that ionic transport is significantly enhanced while the introduction of hollow cores with thinner shell, by virtue of the hollow nanopore‐accelerated mass transport to reduce ion diffusion length. The proof‐of‐concept supercapacitors, constituted of carbons with diameter and shell thickness of 91 and 28 nm, respectively, can maintain highest capacitance retention ratio of 86% at a high sweep rate of 300 mVs−1, also far outperforming the commercial activated carbon in terms of capacitance, rate capability, and surface efficiency, promising a brilliant application.
