Synthesis and characterization of polypyrrole/nickel hydroxide/sulfonated graphene oxide ternary composite for all-solid-state asymmetric supercapacitor
2018
Abstract The polypyrrole/nickel hydroxide/sulfonated graphene oxide (PPy/Ni(OH) 2 /SGO) ternary composite is prepared as supercapacitor electrode material by stepwise loading of Ni(OH) 2 and PPy into SGO through hydrothermal and chemical oxidative polymerization process. The PPy and Ni(OH) 2 are incorporated into composite to act as pseudocapacitive electrode with low cost and high capacitance. The SGO obtained by the surface modification of graphene has a higher hydrophilic property and larger specific surface to provide charge transfer path. The creative PPy/Ni(OH) 2 /SGO (P-N-S) ternary composite shows a high specific capacitance of 1632.5 F g −1 at a current density of 1 A g −1 in 6 M KOH solution. A capacitance retention of 86% after 1000 cycles proves that the P-N-S has a good cycling stability. The all-solid-state asymmetric supercapacitor (ASC) is assembled with P-N-S cathode material and activated carbon (AC) as anode material to exhibit a high special capacitance of 224 F g −1 at 1 A g −1 , a large energy density (79.6 Wh Kg −1 ) and power density (0.8 kW kg −1 ), and a stable cycle life (the capacitance retention rate of 60% after 5000 cycles at 10 A g −1 ). Two ASCs in series can lighten up a green LED indicator.
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