Tailoring in-situ N, O, P, S-doped soybean-derived porous carbon with ultrahigh capacitance in both acidic and alkaline media

Jianhua Yu, Xu Li, Zhenxing Cui, Di Chen, Xiancai Pang, Qian Zhang, Feifei Shao, Hongzhou Dong, Liyan Yu and Lifeng Dong

Renewable Energy, 2021, vol. 163, issue C, 375-385

Abstract: In order to improve electrochemical capacitance properties of biomass-derived porous carbon materials, this work develops a low temperature pre-carbonization, hydrothermal stabilization and KOH activation method to derive N, O, P, S co-doped porous carbon materials from protein-rich soybeans and effectively enhances specific capacitances in both acidic and alkaline aqueous electrolytes. Specially, the derived porous carbon demonstrates an ultra-high specific capacitance of 685.1 F g−1 at 0.5 A g−1 in 2 M KOH and 439.5 F g−1 at 1 A g−1 in 1 M H2SO4, respectively. Moreover, a superior cycling stability is achieved with a capacitance retention of 80% after 13,000 cycles at a current density of 20 A g−1 in 2 M KOH. An asymmetric supercapacitor consisting of soybean-derived carbon and NiCo-sulfide delivers a high energy density of 41.8 Wh kg−1 at a power density of 750 W kg−1. The findings above indicate hydrothermal process can effectively stabilize heteroatoms (N and P), improve graphitization and thereby enhance capacitive properties of biomass-derived carbon materials.

Keywords: Biomass; Doping; Energy storage; Porous carbon; Supercapacitor (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:163:y:2021:i:c:p:375-385

DOI: 10.1016/j.renene.2020.08.066

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