Fused Heterocyclic Molecule-Functionalized N-Doped Reduced Graphene Oxide by Non-Covalent Bonds for High-Performance Supercapacitors

作者：Xu, Liming; Zhang, Yingying; Zhou, Weiqiang^*; Jiang, Fengxing; Zhang, Hui; Jiang, Qinglin; Jia, Yanhua; Wang, Rui; Liang, Aiqin; Xu, Jingkun^*; Duan, Xuemin

来源：ACS applied materials & interfaces, 2020, 12(40): 45202-45213.

DOI：10.1021/acsami.0c13377

• N-doped graphene
• indole
• non-covalently functionalization
• supercapacitor
• energy density

Indole molecules with fused heteroaromatic structures can be adsorbed on the N-doped graphene surface through the pi-pi interaction. Therefore, the indole-functionalized N-doped graphene (InFGN) with mesopores is successfully fabricated by a simple hydrothermal method and subsequent vacuum freeze-drying process. The microstructure, thickness, element composition, pore structure, and electrochemical performance of InFGN are analyzed via SEM, TEM, AFM, BET, UV-vis, FT-IR, XPS, Raman, XRD, and electrochemical technologies. Since the five-membered aromatic heterocycles are electron-rich, the indole molecules fixed on the N-doped graphene surface can repair the structural defects generated by N doping. Electrochemical measurements show that the InFGN electrode highlights an excellent capacitance of 622.3 F g(-1) at 2 A g(-1) and a durable cycling life of 100.5% after 5000 charging/discharging cycle times. For further practical application, a symmetric device has been assembled by using InFGN electrodes, which realizes high-power and energy densities (18.8-20.6 Wh kg(-1) at 800-8000 W kg(-1)). This study provides a shortcut for building green supercapacitors with enhanced energy storage performance.

• 单位
  南京大学; jk