Nitrogen and sulfur co-doped graphene aerogel with hierarchically porous structure for high-performance supercapacitors

• 作者: Kelei Zhuo Li Sun Xiaochao Xu Xiaohui Wang Yujuan Chen Zhiwei Lu
• 来源期刊: 绿色能源与环境:英文版
• 学科: 化学
• 关键词: GRAPHENE AEROGEL Hierarchically porous structure SUPERCAPACITOR IONIC liquid
• 年，卷（期）: 2020,（1）
• 页码范围: 69-75
• 页数: 7页
• 分类号: O61

摘要

Supercapacitors with unique performance have been widely utilized in many fields. Herein, we report a nitrogen and sulfur co-doped graphene aerogel(N/S-GA-2) prepared using a low toxic precursor for high-performance supercapacitors. The as-obtained material possesses a hierarchically porous structure and a large number of electrochemical active sites. At a current density of 1 Ag^-1, the specific capacitance of the N/S-GA-2 for supercapacitors with the ionic liquid as the electrolyte is 169.4 Fg^-1, and the corresponding energy density is 84.5 Wh kg^-1.At a power density of 8.9 k W kg^-1, the energy density can reach up to 75.7 Wh kg^-1, showing that the N/S-GA-2 has an excellent electrochemical performance. Consequently, the N/S-GA-2 can be used as a promising candidate of electrode materials for supercapacitors with high power density and high energy density.