期刊
ENERGY REPORTS
卷 8, 期 -, 页码 648-660出版社
ELSEVIER
DOI: 10.1016/j.egyr.2022.08.038
关键词
Amide nitrogen; Biomass-based carbon; Ammonization; Supercapacitors
资金
- National Natural Science Foundation of China [21876086]
- Key research and development plan of Jiangsu Province of China [BE2018708]
This study presents a novel synthesis strategy for the rational design of eco-friendly and low-cost biomass-based carbons for high-performance supercapacitors. The synthesized carbons exhibited high nitrogen-doping levels and surface areas, with the amide nitrogen content playing a significant role in enhancing the capacitance.
The rational design and synthesis of environmental, low-cost and eco-friendly renewable biomass-based carbons are highly desired for the development of high-performance supercapacitors. Herein, a novel amide-enriched synthesis strategy for biomass-based carbon from bayberry core (BC) by in-situ melamine-BC prepolymerization and subsequent NH3 ammonization. The synthesized biomass-based BC carbons were characterized by N-2 adsorption/desorption, scanning electron microscope, Raman spectroscopy, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The results showed that the BC carbons by melamine and ammonization co-treatment had both much higher N-doping level (up to 6.43%) and surface area (up to 960 m(2) g(-1)) than the N-free doped carbon. The doped N functional group was mainly dominated by the form of amide-N rather than pyridine-N or quaternary-N. More excitingly, the amide-N content increased with the extension of ammonization time while pyridine-N and quaternary-N went down. The prepared amide-enriched BC carbon via 20 g melamine pre-polymerization and 3 h ammonization treatment delivered an excellent specific capacitance of 259 F g(-1), which was 35-72 F g(-1) higher than the samples by 1h and 2h NH3 treatment though the latter two had much higher surface area, pyridine and quaternary-N content. The results indicated that the amide-N on the N-doped biomass-based carbon made a great role for enhancing the capacitance, and its promotion to electric double layer capacitance and pseudo-capacitance exceeded that of pyridine and quaternary-N. (C) 2022 The Author(s). Published by Elsevier Ltd.
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