Facile solvothermal synthesis of a graphene nanosheet-bismuth oxide composite and its electrochemical characteristics |
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Authors: | Huan-Wen Wang Yan-Qin Chang Yan-Li Chen Zi-Qiang Lei Zi-Yu Zhang Yu-Ying Yang |
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Affiliation: | Key Laboratory of Eco-Environment-Related Polymer Materials of Ministry of Education, Key Laboratory of Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, PR China |
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Abstract: | This work demonstrates a novel and facile route for preparing graphene-based composites comprising of metal oxide nanoparticles and graphene. A graphene nanosheet-bismuth oxide composite as electrode materials of supercapacitors was firstly synthesized by thermally treating the graphene-bismuth composite, which was obtained through simultaneous solvothermal reduction of the colloidal dispersions of negatively charged graphene oxide sheets in N,N-dimethyl formamide (DMF) solution of bismuth cations at 180 °C. The morphology, composition, and microstructure of the composites together with pure graphite oxide, and graphene were characterized using powder X-ray diffraction (XRD), FT-IR, field emission scanning electron microscopy (FESEM), transmission electron microscope (TEM), thermogravimetry and differential thermogravimetry (TG-DTG). The electrochemical behaviors were measured by cyclic voltammogram (CV), galvanostatic charge-discharge and electrochemical impedance spectroscopy (EIS). The specific capacitance of 255 F g−1 (based on composite) is obtained at a specific current of 1 A g−1 as compared with 71 F g−1 for pure graphene. The loaded-bismuth oxide achieves a specific capacitance as high as 757 F g−1 even at 10 A g−1. In addition, the graphene nanosheet-bismuth oxide composite electrode exhibits the excellent rate capability and well reversibility. |
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Keywords: | Graphene Bismuth oxide Composite Supercapacitors |
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