Journal
CERAMICS INTERNATIONAL
Volume 44, Issue 1, Pages 980-987Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2017.10.032
Keywords
3D structure; High energy; Graphene; Cobalt oxide; Nanocomposite; Supercapacitor
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Funding
- Energy Efficiency & Resources program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant - Ministry of Trade, Industry Energy [20152020105770]
- National Research Foundation (NRF) - Ministry of Science, ICT, & Future Planning, Republic of Korea [NRF-2017M2A2A6A01021187]
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The integration of pseudocapacitive metal oxides with reduced graphene oxide (RGO) is considered an innovative chemical strategy to resolve both bottlenecks of pseudocapacitor and electrical double-layer capacitor for high performance supercapacitors. Herein, we report a facile synthesis method of highly porous three-dimensional (3D) CoO/RGO nanocomposite via ozone treatment, ice templating, and thermal annealing. The ozonized RGO surface provides a favorable interaction with cobalt precursor for a stable and uniform deposition of well-defined CoO nanoparticles. The morphology, structure, and chemistry of the resulting CoO/RGO nanocomposites are comprehensively characterized by spectroscopic methods. The CoO/RGO nanocomposites show fast and reversible pseudocapacitance due to a large accessible area, rapid ion transport, and low charge transfer resistance arising from 3D internetworked macroporosity. Thus, the nanocomposites achieve high specific capacitance up to 239.4 F g(-1) (volumetric capacitance = 12.04 F cm(-3)), excellent rate capability of 79.1%, and ultralong cyclic stabilities (of 93.2% at 10 A g(-1) even up to 10,000 cycles) in 6 M KOH electrolyte. This simple synthesis method offers a promising solution for the design of high performance hybrid energy storage materials consisting of high capacity metal oxides and conductive graphene networks.
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