Optimized core–shell polypyrrole-coated NiCo2O4 nanowires as binder-free electrode for high-energy and durable aqueous asymmetric supercapacitor

Optimized core–shell polypyrrole-coated NiCo2O4 nanowires as binder-free electrode for... Cathode design is of essence for fabricating aqueous asymmetric supercapacitor (ASC) device accompanying with high energy density and long cycle life. Nickel cobaltite, owing to the high theoretical capacity and good redox reversibility, is one of the most promising cathode materials for ASC device. However, the poor conductivity and cycling stability lead to a low practical capacity. A novel core–shell structure polypyrrole-coated NiCo2O4 nanowires are rationally designed and synthesized via hydrothermal synthesis of the NiCo2O4 nanowires and subsequently electrodeposition of the polypyrrole (PPy) outer shell. By adjusting the PPy load mass, the optimized electrode shows a high specific capacitance (2302 F g−1 at 2 A g−1), excellent rate properties and enhanced cycling performance (93.9% retention of capacity after 5000 cycles). Furthermore, an ASC device based on the PPy-coated NiCo2O4 nanowires as cathode and activated carbon as anode demonstrates a high energy density of 45.6 Wh kg−1 at a power density of 362 W kg−1. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Materials Science Springer Journals

Optimized core–shell polypyrrole-coated NiCo2O4 nanowires as binder-free electrode for high-energy and durable aqueous asymmetric supercapacitor

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Publisher
Springer US
Copyright
Copyright © 2017 by Springer Science+Business Media, LLC
Subject
Materials Science; Materials Science, general; Characterization and Evaluation of Materials; Polymer Sciences; Continuum Mechanics and Mechanics of Materials; Crystallography and Scattering Methods; Classical Mechanics
ISSN
0022-2461
eISSN
1573-4803
D.O.I.
10.1007/s10853-017-1742-x
Publisher site
See Article on Publisher Site

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