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- Publisher
- Wiley
- Copyright
- Copyright © 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim
- ISSN
- 1616-301X
- eISSN
- 1616-3028
- DOI
- 10.1002/adfm.201200994
- Publisher site
- See Article on Publisher Site
Abstract
A facile two‐step method is developed for large‐scale growth of ultrathin mesoporous nickel cobaltite (NiCo2O4) nanosheets on conductive nickel foam with robust adhesion as a high‐performance electrode for electrochemical capacitors. The synthesis involves the co‐electrodeposition of a bimetallic (Ni, Co) hydroxide precursor on a Ni foam support and subsequent thermal transformation to spinel mesoporous NiCo2O4. The as‐prepared ultrathin NiCo2O4 nanosheets with the thickness of a few nanometers possess many interparticle mesopores with a size range from 2 to 5 nm. The nickel foam supported ultrathin mesoporous NiCo2O4 nanosheets promise fast electron and ion transport, large electroactive surface area, and excellent structural stability. As a result, superior pseudocapacitive performance is achieved with an ultrahigh specific capacitance of 1450 F g−1, even at a very high current density of 20 A g−1, and excellent cycling performance at high rates, suggesting its promising application as an efficient electrode for electrochemical capacitors.
Journal
Advanced Functional Materials – Wiley
Published: Nov 7, 2012