N/S co-doped carbon nanosheets derived from sugarcane processing by-products for flexible solid-state supercapacitors

作者：Shi, Fangfang; Zhang, Zhengchu; Xu, Yongjie; Yang, Chao^*; Qiu, Jianhui; Liao, Jiachi; Zang, Limin^*

来源：Journal of Electroanalytical Chemistry, 2023, 932: 117217.

DOI：10.1016/j.jelechem.2023.117217

• Supercapacitor
• Carbonization
• Biomass -derived carbon
• Sulfonated potassium fulvic acid

Developing sustainable carbon materials from biomass for supercapacitors is a promising solution to alleviate energy and environmental pressures. In this paper, novel N/S co-doped carbon nanosheets derived from sug-arcane processing by-products are proposed. Flexible and binder-free electrodes based on carbon felt and sul-fonated potassium fulvic acid were prepared by a simple impregnation-carbonization method. The maximum areal specific capacitance, power density and energy density of the symmetric supercapacitor are 409.9 mF cm-2 (1 mA cm-2), 0.92 mW cm-2 and 184.5 mu Wh cm-2, respectively. The operating voltage of the device increases to 1.8 V by using LiCl electrolyte. After 10,000 cycles, the capacitance remains 90 % of its initial value. Besides, the device possesses good flexibility, which can be bent at different angles and has a capacitance retention of 92.3 % after 5000 bending cycles. The supercapacitor is of great significance for the recovery of crop processing by-products to prepare flexible electronic devices.

• 单位
  西北工业大学; 桂林理工大学