Electrochemical characteristics of the reduced graphene oxidecarbon nanotubepolypyrrole composites for aqueous asymmetric supercapacitors》.pdf

Journal of Power Sources 272 (2014) 970 e978 Contents lists available at ScienceDirect Journal of Power Sources journal homepage: /l ocate/jpowsour Electrochemical characteristics of the reduced graphene oxide/carbon nanotube/polypyrrole composites for aqueous asymmetric supercapacitors Yu-Jung Peng, Tzu-Ho Wu, Chun-Tsung Hsu, Shin-Ming Li, Ming-Guan Chen, * Chi-Chang Hu Laboratory of Electrochemistry Advanced Materials, Department of Chemical Engineering, National Tsing Hua University, Hsin-Chu 30013, Taiwan h i g h l i g h t s Introducing XC-72 improves potential window, reversibility, specific capacitance, and stability of rGO/CNT/PPy. rGO/CNT/PPy þ XC-72 is a suitable negative electrode material in aqueous asymmetric supercapacitors (ASCs). 1 1 The specific energy and power of an ASC with a cell voltage of 1.6 V reach 14.3 Wh kg and 6.62 kW kg . This ASC shows ideal capacitive behavior after the 3250-cycle stability test between 0 and 1.6 V. a r t i c l e i n f o a b s t r a c t Article history: Polypyrrole (PPy) has been polymerized onto reduced graphene oxide/carbon nanotube (rGO/CNT) to Received 30 May 2014 form an rGO/CNT/PPy composite using the chemical oxidation method. The electrochemical character- Received in revised form istics of the above composite in various aqueous electrolytes are systematically compared for the 19 August 2014