Dodecahedral carbon with hierarchical porous channels and bi-heteroatom modulated interface for high-performance symmetric supercapacitors

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Dodecahedral carbon with hierarchical porous channels and bi-heteroatom modulated interface for high-performance symmetric supercapacitors

Yang, Jieru; Meng, Jian; Zhang, Leiqian; Chu, Kaibin; Zong, Wei; Ge, Lingfeng; Fu, Siyu; ... Liu, Tianxi; + view all (2022) Dodecahedral carbon with hierarchical porous channels and bi-heteroatom modulated interface for high-performance symmetric supercapacitors. Journal of Power Sources , 549 , Article 232111. 10.1016/j.jpowsour.2022.232111. Green open access

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Abstract

Hierarchical porous channels and a well-modulated interface are two main parameters for electrode materials that can promote their energy storage performance by accelerating the electrolyte diffusion and realizing their strong coupling with electrolyte ions. Inspired by the COMSOL Multiphysics simulations and density functional theory calculations, we design B, N dual-doped, hierarchical porous carbon (BN-HPC) by pyrolyzing hierarchical porous zeolitic imidazolate framework-8 with boric acid. The resulted BN-HPC electrode achieves a high specific capacitance of 236.9 F g−1 at a current density of 1 A g−1 in 1 M H2SO4 electrolyte, which is further assembled into the BN-HPC//BN-HPC symmetric supercapacitor with a high energy density of 33.3 Wh kg−1 at a power density of 212.5 W kg−1. The excellent energy storage performance of the BN-HPC electrode is attributed to its hierarchical porous structure and bi-heteroatom (N and B) doped carbon surface with a low binding energy value of −2.77 eV. This work provides a general and fresh insight into the design of dodecahedral carbon by combining hierarchical porous structure and bi-heteroatom doping strategy that can be used for not only aqueous supercapacitors but also other energy storage devices.

Type:	Article
Title:	Dodecahedral carbon with hierarchical porous channels and bi-heteroatom modulated interface for high-performance symmetric supercapacitors
Open access status:	An open access version is available from UCL Discovery
DOI:	10.1016/j.jpowsour.2022.232111
Publisher version:	https://doi.org/10.1016/j.jpowsour.2022.232111
Language:	English
Additional information:	This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords:	BIOMASS, Chemistry, Chemistry, Physical, CO2, COMSOL Multiphysics simulation, DFT calculation, Dual -doped, Electrochemistry, ELECTRODE, Energy & Fuels, Hierarchical porous carbon, KOH ACTIVATION, Materials Science, Materials Science, Multidisciplinary, METAL-ORGANIC FRAMEWORK, NANOSHEETS, Physical Sciences, POLYMER, POLYPYRROLE, PORE, Science & Technology, STRATEGY, Supercapacitors, Technology
UCL classification:	UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering
URI:	https://discovery.ucl.ac.uk/id/eprint/10162867