Electrochemical performance of reduced graphene oxide in Spiro-(1, 1')-bipyrrolidinium tetrafluoroborate electrolyte

• Published in: International journal of energy research Vol. 40; no. 8; pp. 1105 - 1111
• Main Authors: He, Tie-Shi, Ren, Xue, Wang, Ya-Bin, Nie, Jun-Ping, Cai, Ke.-Di
• Format: Journal Article
• Language: English
• Published: Bognor Regis Blackwell Publishing Ltd 25.06.2016; Hindawi Limited
• Subjects: 1')-bipyrrolidinium tetrafluoroborate; Ascorbic acid; Capacitance; chemical reduction; Electrochemical analysis; Electrodes; Graphene; Heat treatment; Ionic mobility; Oxides; reduced graphene oxide; spiro-; spiro‐(1,1')‐bipyrrolidinium tetrafluoroborate; supercapacitor
• ISSN: 0363-907X; 1099-114X
• DOI: 10.1002/er.3504

Summary This paper investigates the relationship between structure and electrochemical performance of reduced graphene oxide (RGO) prepared via heat treatment and chemical reduction method. Structure and morphology of RGO was characterized by means of Fourier transform infrared spectroscopy, scanning electron microscopy, X‐ray diffraction and Brunauer–Emmett–Teller. Electrochemical performance of RGO electrode supercapacitor was investigated in the organic electrolyte by cyclic voltammetry, galvanostatic charge–discharge and electrochemical impedance. The results show heat treatment RGO has high graphitization degree, less surface oxygen‐containing groups, good charge–discharge efficiency and stable life cycle. The chemical reduced RGO has single‐graphene structure, high specific surface area, high specific capacitance and low internal resistance. The ascorbic acid reduction RGO exhibits good comprehensive electrochemical performance: Its specific capacitance was 220.7 F g−1, internal resistance was 3.0 Ω and charge–discharge efficiency was 97.0% after 2000 cycles of charging/discharging tests. Copyright © 2016 John Wiley & Sons, Ltd. The voltage drop of heat treatment RGO was low because of its high graphitization degree and meso/macro pore structure. So it has high ion and electric mobility rate in RGO electrode that lead to its small internal resistance, as shown in Figures (c) and (d) in the figure. The ascorbic acid RGO has minimum value voltage drop than that of the other RGO, because of its open 2D plane morphology that decrease the ion mobility resistance tremendously, as shown in (a) in the figure.