N‑Doped Hierarchical Continuous Hollow Thin Porous Carbon Nanostructure for High-Performance Flexible Gel-Type Symmetric Supercapacitors

Published on 2019-09-11T17:48:32Z (GMT) by
A N-doped hierarchical porous carbon nanostructure (NHPCN) was created on a carbon cloth (CC), through a templating process using self-assembled mesoporous silica spheres as the template, to fabricate high-performance flexible gel-type symmetric supercapacitors (NHPCN@CC//NHPCN@CC). The NHPCN@CC//NHPCN@CC cell exhibited outstanding capacitive performances, giving a decent energy density of 10.3 W h kg<sup>–1</sup> at a high power density of 10 kW kg<sup>–1</sup> and reaching a high energy density of 24.3 W h kg<sup>–1</sup> at a power density of 0.5 kW kg<sup>–1</sup>, outperforming most carbon-based gel-type, symmetric supercapacitors. This success may be attributed to the continuous hollow, thin features of the NHPCN, with the hollow structure enabling local, fast adsorption/desorption of electrolyte ions for generation of electric double-layer capacitances and the thin carbon shells offering large amounts of exposed surface areas for accommodation of electric double-layer capacitances and pseudo-capacitances. The NHPCN@CC//NHPCN@CC cell exhibited a high specific capacitance retention rate of 85% after 8000 cycle operations at 10 A g<sup>–1</sup>, showing its good cycling stability. The mechanical robustness of the NHPCN@CC//NHPCN@CC cell was also excellent, with the energy and power densities well-maintained even under a large bending angle of 135°.

Cite this collection

Cheng, Po-Yuan; Cheng, Heng-Yi; Huang, Chun-Lung; Chen, Yu-An; Hsieh, Cheng-Ting; Lu, Shih-Yuan (2019): N‑Doped Hierarchical Continuous Hollow Thin

Porous Carbon Nanostructure for High-Performance Flexible Gel-Type

Symmetric Supercapacitors. ACS Publications. Collection.