Journal
DIAMOND AND RELATED MATERIALS
Volume 130, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2022.109526
Keywords
Biomass; Porous carbon material; N -doping; Supercapacitor
Categories
Funding
- Open Fund of Fujian Provincial Key Laboratory of Green Chemical Technology [WYKF-GCT2021-1]
- Open Fund of Fujian Provincial Key Laboratory of Eco-Industrial Green Technology [WYKF-EIGT2022-1]
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In this study, N-doped porous carbon electrodes were prepared by one-step activation carbonization method using camellia oleifera branches as raw material and NH4Cl as the activator. The N-doped sample exhibited high specific capacitance and superior rate performances, which can widen its practical application in supercapacitor devices.
In recent years, various biomasses (such as coconut, cotton, wheat straw, basswood, bamboo, etc.) have been utilized to prepare porous carbon materials (PCMs) through carbonization and/or physical/chemical activation. Most of these carbon materials are limited by the electric double-layer capacitance, resulting in a limited specific capacitance. Moreover, the preparation processes are often complicated and the carbon yield is low. Therefore, from the perspective of green and sustainable preparation of PCMs with high carbon yield and high performance, in this study, N-doped porous carbon electrodes were prepared by one-step activation carbonization method using camellia oleifera branches as raw material and NH4Cl as the activator. The N-doped NCW-2 sample has a rational hierarchical porous structure and high N doping amount (3.35 at. %) and exhibited optimal rate per-formance with a specific capacitance of 250 F g-1 at 50 A g-1. The symmetrical device also presented excellent performance with a capacitance retention of 93.7 % after cycling 30,000 times at 20 A g-1 and delivered superior rate performances of 22.3 W h kg- 1@100 W kg- 1 to 11.8 W h kg-1@4800 W kg -1. This work may provide a certain reference for the preparation of N-doped biomass-derived PCMs and widen its practical application in supercapacitor devices.
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