Journal
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Volume -, Issue 8, Pages 1143-1152Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.201601202
Keywords
Self-assembly; Gels; Graphene; Nanotechnology; Asymmetric supercapacitors
Categories
Funding
- Special Innovation Talents of Harbin Science and Technology [2014RFQXJ013]
- Heilongjiang Postdoctoral Fund [LBH-Z15192]
- Science and Technology Planning Project from Education Department of Heilongjiang Province [12543042]
- Scientific Research Foundation for Youths of Harbin University [HUYF2013014]
- National Natural Science Foundation of China (NSFC) [21404027, 51301050]
- Fundamental Research Funds of the Central University (HEUCFZ)
- Natural Science Foundation of Heilongjiang Province [B2015021]
- International Science & Technology Cooperation Program of China [2015DFR50050]
- Major Project of Science and Technology of Heilongjiang Province [GA14A101]
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A facile one-step hydrothermal strategy has been developed to prepare 3D porous Co3O4/graphene aerogel (Co3O4/GA). Due to the combination of a highly interconnected 3D network of GA and porous Co3O4 nanospheres, the resulting Co3O4/GA electrode exhibits exceptional electrical conductivity and pseudocapacitance, making it an excellent material for energy-storage devices. The Co3O4/GA composites possess a high specific surface area of 127 m(2) g(-1) and a broad pore-size distribution of 1-110 nm. The presence of porous Co3O4 is found to be remarkably effective in enhancing the specific capacitance of the composite aerogel, up to 1512.7 F g(-1) at 1 A g(-1). Furthermore, the combination of the two aerogel electrodes with a LiOH/PVA-gel electrolyte endows our all-solid-state asymmetric supercapacitor (SASC) of Co3O4/GA//GA with a stable cycling performance in the high-voltage region of 0-1.6 V (capacitance retention of 81.5 % after 5000 continuous charge/discharge cycles), and superior electrochemical performance, with an energy density of 68.1 W h kg(-1) at a power density of 982.9 W kg(-1), which is even higher than the maximum energy density of 58.7 W h kg(-1) at a power density of 1209.4 W kg(-1) of this ASC in a liquid-state electrolyte. These results indicate that Co3O4/GA could be a potential candidate in the field of supercapacitors.
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