Controllable self‐propagating reduction of graphene oxide films for energy‐efficient fabrication. (31st December 2021)

• Record Type: Journal Article
• Authors: Tran, Chau Van; Khandelwal, Mahima; Lee, Jungbae; Nguyen, Anh Phan; In, Jung Bin
• Is Part Of: International journal of energy research. Volume 46:Number 5(2022)
• Page Start: 6876
• Page End: 6888
• Publication Date: 2021-12-31
• Subjects: graphene oxide -- reduced graphene oxide -- reduction -- self‐propagation -- supercapacitor; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Power resources -- Research -- Periodicals; 621.042
• DOI: 10.1002/er.7617
• Languages: English
• ISSNs: 0363-907X

Abstract

Summary: The reduction of graphene oxide (GO) generally involves the use of chemical agents or high‐temperature processes, raising concerns about safety, environment, and energy consumption issues. While self‐propagating reduction of GO films was observed to produce functional rGO, potentially mitigating these issues, its process control has not yet been extensively explored. This study proposes a controllable self‐propagating reduction of GO films by adjusting the base temperature of the films within low values (50°C‐90°C). For understanding the reduction mechanism, the speed and peak temperature of the moving reduction front were measured in real‐time, and a heat transfer model was proposed to explain the self‐propagating reduction based on the observed reduction kinetics. When used for binder‐free supercapacitor electrodes, the rGO films exhibited competitive specific capacitance (112 F/g) and excellent capacitance retention (94%) after 10 000 cycles. This study opens a new avenue for efficiently exploiting the self‐propagating reduction of GO films to produce high‐quality rGO at a minimal energy cost. Abstract : Controlled self‐propagating reduction of graphene oxide film was achieved by adjusting the temperature of the film base The self‐propagating reduction mechanism was explored based on in‐situ temperature measurement The reduced graphene oxide film exhibited a large specific surface area and high electrochemical capacitance, which are required for application in supercapacitor electrodes