Urchin-like Ni1/3Co2/3(CO3)0.5OH·0.11H2O anchoring on polypyrrole nanotubes for supercapacitor electrodes-Huiqi Wang

Metal carbonate hydroxide is a promising electrode material for advanced supercapacitors but suffers from the poor electronic conductivity. Herein, we address this issue through the in-situ formation of Ni1/3Co2/3(CO3)0.5OH$0.11H2O anchoring onto the surface of polypyrrole nanotubes via a hydrothermal method. The Ni1/3Co2/3(CO3)0.5OH$0.11H2O/polypyrrole nanotubes composites possess high speci?c surface area and electronic conductivity, resulting in large charge storage and fast charge/discharge rate.

The synthesized composite electrodes exhibit a high speci?c capacitance of 964.8 F g-1

at 1 A g1 and low the equivalent series resistance of 0.24 U . Moreover, the assembled asymmetric supercapacitors exhibithigh energy density of 41.86 Wh kg-1

with a power density of 562 W kg-1, and high power density of 11.25 kW kg-1 with an energy density of 16.97 Wh kg-1. The capacitance retention remains 80.2% after 5000 cycles at 5 A g

-1, indicating the excellent cycling stability. The results indicate that Ni1/3Co2/3(CO3)0.5OH$0.11H2O/polypyrrole nanotubes composites are a potential electrode material for high-performance supercapacitors.

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