Designing Tubular Architectures Composed of Hollow N‐Doped Carbon Polyhedrons for Improved Supercapacitance
Hai Xu, Zhenjie Yao, Yujiao Gong, Henghan Dai, Chenyang Yu, Gang Qin, Jinyuan Zhou, Qiang Chen, Xiang Liu, Gengzhi Sun
Abstract
Abstract Despite great efforts that have been made to develop high performance carbonaceous materials via structure design for charge storage applications, constructing tubular architectures composed of hierarchically nanoscale building units is challenging due to the lack of suitable synthetic method. Herein, using zeolitic imidazolate framework‐8 (ZIF‐8) as the self‐template and electrospun polyacrylonitrile (PAN) nanofibers as the sacrificial core, hierarchically tubular architectures composed of hollow N‐doped carbon polyhedrons (T‐HNCPs) are successfully obtained. Due to its unique structural characteristics and the merit of N‐doping, the as‐prepared T‐HNCPs electrode with much open structure (average pore size of ≈2.38 nm and specific surface area of 1302.5 m 2 g −1 ) exhibits improved specific gravimetric capacitances of 351.2 and 230.4 F g −1 at 1 and 20 A g −1 (corresponding to 65.6% retention), respectively, together with outstanding charge/discharge stability.