Rapeseed meal-derived N,S self-codoped porous carbon materials for supercapacitors

• Published in: New journal of chemistry 2022-06, Vol.46 (22), p.1752-1764
• Main Authors: Bai, Jiaming, Mao, Songbo, Guo, Feiqiang, Shu, Rui, Liu, Sha, Dong, Kaiming, Yu, Youjin, Qian, Lin
• Format: Article
• Language: English
• Subjects: Capacitance; Carbon; Chemical properties; Electrode materials; Electrodes; Porous materials; Rapeseed; Supercapacitors
• ISSN: 1144-0546; 1369-9261
• DOI: 10.1039/d2nj00791f

The conversion of bio-waste rich in heteroatoms into useful porous carbons with good chemical properties is a feasible approach contributing to electrode materials for supercapacitors. In this work, rapeseed meal rich in crude protein is used as the precursor to synthesize N,S self-codoped porous carbons. The carbon sample obtained via pre-carbonization followed by KOH activation (RM@HTC) exhibits a developed micro-mesoporous interconnected carbon structure with a large specific surface area of up to 3283.2 m −2 g −1 . The N and S atoms are well retained with a N content of 1.49% for RM@HTC. In a three-electrode system, the RM@HTC-based electrode reaches a high specific capacitance of 303.4 F g −1 at a current density of 1 A g −1 , and the specific capacitance is retained at 210.0 F g −1 at 10 A g −1 . In a two-electrode system, the energy density reaches 9.0 W h kg −1 at a power density of 625.0 W kg −1 . RM@HTC also exhibits excellent cycle stability with a capacity retention rate of 92.9% after 10 000 charge-discharge cycles at 10 A g −1 . N,S self-doped porous carbon with high specific surface area and gravimetric specific capacitance from rapeseed meal was successfully synthesized.