Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 4, Issue 13, Pages 4820-4830Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta10407f
Keywords
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Funding
- EU [604360]
- Science Foundation Ireland under a Technology Innovation and Development [14/TIDA/2455, 13/TIDA/E2761]
- Seventh Framework Programme (Project STABLE) [314508]
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Three-dimensional (3D) hybrid nanostructured electrodes based on one-dimensional (1D) nanorod arrays have recently attracted great attention owing to their synergistic effect of three-dimensional nanostructures and application in energy storage and conversion devices. Here, we designed a heterostructured supercapattery electrode from a combination of NiO and In2O3 with a hierarchical hybrid microstructure on nickel foam (NF). Simultaneous heterogeneous growth of 1D nanorod-supported 3D microflower structures on nickel foam enhanced the non-capacitive faradaic energy storage performance due to the synergistic contribution from hierarchical hybrid nanostructure. The heterostructured electrode exhibits a high specific capacity of 766.65 C g(-1) at 5 A g(-1) and remains as high as 285.12 C g(-1) at 30 A g(-1). The composite electrode shows an excellent rate performance as a sandwich type symmetric device, offering a high specific energy of 26.24 W h kg(-1) at a high power of 1752.8 W kg(-1). The device shows a long term cyclic stability with 79% retention after 50 000 cycles, which is remarkable for an oxide based pseudocapacitor. These results suggest that NiO-In2O3 with hybrid micro/ nano architecture could be a promising electrode for next generation supercapatteries.
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