Supramolecular‐driven fabrication of porous nitrogen/sulfur co‐doped graphene toward high‐performance supercapacitor. (11th August 2022)

• Record Type: Journal Article
• Authors: Cheng, Honghong; Li, Bo; Meng, Tao; Liu, Cong; Shu, Dong
• Is Part Of: International journal of energy research. Volume 46:Number 13(2022)
• Page Start: 18624
• Page End: 18633
• Publication Date: 2022-08-11
• Subjects: heteroatoms doping -- L‐cysteine -- N, S‐doped graphene -- supercapacitor -- supramolecular assembly; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Power resources -- Research -- Periodicals; 621.042
• DOI: 10.1002/er.8477
• Languages: English
• ISSNs: 0363-907X

Abstract

Summary: Practical applications of graphene‐based materials are still inhibited by the serious restacking of graphene nanosheets and single electrical double‐layer capacitor energy storage mechanism. To address these issues, nitrogen/sulfur‐co‐doped reduced graphene oxide (N/S‐rGO) was ingeniously prepared by supermolecular‐driven in‐situ co‐dope method. In this article, the GO/L‐cysteine supermolecular system was assembled first, the hydrogen bond between L‐cysteine and GO is confirmed by the Fourier‐transform infrared spectroscopy (FTIR). The theoretical calculation result indicating that L‐cysteine is uniformly assembled on GO surface by supermolecular interaction force (dispersion force and hydrogen bond). Due to the oriented supermolecular force, the thus‐fabricated N/S‐rGO affords customized three‐dimensional (3D) porous structure, uniform N, S co‐doping, effective electrolyte ion‐transport pathways, and satisfactory structural stability. Attributing to the inherent plentiful 3D cavity structure and synergistic effect between N, S heteroatoms, N/S‐rGO shows outstanding electrochemical performance, the best‐performed N/S‐rGO2 possess delightful capacitance (416 F g −1 ), after 20 000 cycles the capacitance retention of N/S‐rGO is 110% of the initial value, shows excellent cycle reliability. The N, S‐rGO all‐solid flexible symmetrical supercapacitor can light up luminous diode for 30 seconds when fully charged, indicating that it provides the possibility of practical application. Abstract : N/S‐rGO is synthesized by supermolecular‐driven in‐situ co‐dope method. The L‐cysteine simultaneously achieves N, S co‐doping and pores formation. N/S‐rGO shows high specific capacitance excellent cycle stability and outstanding rate capability.