Oxygen-enriched hierarchical porous carbons derived from lignite for high-performance supercapacitors

Hongwei Liu, Yongzhen Wang, Liang Lv, Xiao Liu, Ziqi Wang and Jun Liu

Energy, 2023, vol. 269, issue C

Abstract: Functional coal-based carbon materials with reasonable pore structure and surface properties have attracted extensive attention for use in high-performance supercapacitors. Herein, a ball milling-assisted bimetallic salt catalytic pyrolysis strategy was developed to prepare oxygen-doped hierarchical porous carbon (OHPC) derived from lignite. The optimized OHPC-1 shows a large specific surface area (1638 m2/g), rational pore structure distribution (mesopores account for 71.3%), and suitable oxygen doping, which ensure sufficient charge storage, rapid electrolyte ions diffusion, as well as the contributed pseudocapacitance. The obtained OHPC-1 exhibits a high specific capacitance of 283 F/g at 0.5 A/g in 6.0 M KOH electrolyte (operating voltage 1.2 V). The assembled OHPC-1//OHPC-1 symmetrical capacitor delivers a high energy density of 16.5 Wh/kg at the power density of 300 W/kg with long cycling stability. In sum, the proposed facile route for high-value utilization of lignite looks promising for the preparation of cost-effective porous carbons for high-performance supercapacitors.

Keywords: Hierarchical porous carbon; Sustained-release structure; Oxygen functional groups; Encapsulation; Pore structure regulation (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:269:y:2023:i:c:s0360544223001019

DOI: 10.1016/j.energy.2023.126707

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