Abstract
Reduced graphene oxide (rGO) is an important derived graphene with promising potential in many fields. However, the low electrical conductivity has severely limited the further development and application of rGO. Here, a two-step reduction method was developed to produce rGO with high electrical conductivity. The first step is chemical reduction using sodium borohydride (NaBH 4 ) as reducing agent, and the second step is hydrothermal treatment at 180 °C. The results show that the chemical-hydrothermal rGO (C-H-rGO) exhibits less defects, excellent thermal stability and high C/O ratio. In particular, C-H-rGO possesses a high electrical conductivity of 1250 S/m, being about 150 times that of chemical rGO (C-rGO) and 25 times that of hydrothermal rGO (H-rGO). Furthermore, the electrode based on C-H-rGO exhibits a high specific capacitance of 180.4 F/g at 1A/g, which is much higher than that of 92.8 F/g for C-rGO and 141.9 F/g for H-rGO. This study provides a new idea for the preparation of high-performance rGO, which is important for the scalable production of graphene materials for supercapacitor electrodes. • Reduced graphene oxide (rGO) with high electrical conductivity was successfully prepared by a two-step chemical-hydrothermal reduction. • The structural characteristics of chemical rGO (C-rGO) and hydrothermal rGO (H-rGO) were compared with each other. • Compared with C-rGO and H-rGO, the chemical-hydrothermal rGO (C-H-rGO) has a significantly enhanced electrical conductivity. • C-H-rGO exhibits a high specific capacitance, much higher C-rGO and H-rGO.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.