Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 2, Issue 5, Pages 1448-1457Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta14488g
Keywords
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Funding
- National Natural Science Foundation of China [21353003]
- Special Innovation Talents of Harbin Science and Technology [2013RFQXJ145]
- Fundamental Research Funds of the Central University (HEUCFZ)
- Natural Science Foundation of Heilongjiang Province [B201316]
- Program of International S&T Cooperation special project [2013DFA50480]
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A hierarchical NiCo2O4@NiO core-shell nanowire hetero-nanostructure has been successfully anchored on a carbon cloth conductive substrate by the stepwise design to fabricate the NiCo2O4@NiO/CC composite for a high-performance flexible all-solid-state electrochemical capacitor. The assembled capacitor exhibits improved pseudocapacitive performance because of the synergetic effect of each component. Impressively, based on the total mass of active material on both electrodes, a high gravimetric capacitance of 1792 F g(-1) at 5 mA cm(-2) is achieved for the final NiCo2O4@NiO/CC flexible capacitor, along with excellent rate capability and cycle performance (with the capacity retention of 87.5% after 5000 cycling). The outstanding electrochemical performances are attributed to its superstructure with significantly enhanced active-surface area, favorable morphological stability and convenient ion transport paths. These results clearly present a cost-effective and alterable method for fabrication of various core-shell nanostructures on flexible conductive substrates, which may bring new design opportunities of device configuration for energy-storage applications in future wearable electronics.
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