Unveiling the dynamic capacitive storage mechanism of Co3O4 @NiCo2O4 hybrid nanoelectrodes for supercapacitor applications
Citation:
Li, Yonghe Zhang, Yuefei Li, Yujie Wang, Zhenyu Fu, Haoyu Zhang, Xiaona Chen, Yanhui Zhang, Hongzhou Li, Xiaodong, Unveiling the dynamic capacitive storage mechanism of Co3O4 @NiCo2O4 hybrid nanoelectrodes for supercapacitor applications, Electrochimica Acta, 145, 0, 2014, 177 - 184Download Item:
Abstract:
We report a simple and cost-effective approach to the synthesis of hierarchical mesporous Co3O4@NiCo2O4 nanoforests on Ni foam for supercapacitor (SC) electrode applications by a coupled one-step solution and annealing process. The synthesized electrode exhibits capacitive activation during charge-discharge cycling (from 0.73 F/cm2 of the pristine state to the peak value of 1.12 F/cm2 after 2000 cycles with only 1.8% loss compared to the peak capacitance after another 2000 cycles). We attribute such dynamic capacitive activation to (1) enlarged electroactive surface area through the formation of Co3O4@NiCo2O4 core-shell structure and (2) enhanced electrical conductivity by forming oxygen vacancies and hydroxyl groups during charge-discharge cycling. Our findings provide a scientific explanation for the capacitive activation in cobalt oxide-binary nickel cobaltite compounds, and a new design guideline for the development of capacitive activation enabled, high performance transitional oxide electrodes.
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http://people.tcd.ie/hozhangDescription:
PUBLISHED
Author: ZHANG, HONGZHOU
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Electrochimica Acta145
0
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PhysicsDOI:
http://dx.doi.org/10.1016/j.electacta.2014.06.168ISSN:
0013-4686Metadata
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