期刊
ELECTROCHIMICA ACTA
卷 152, 期 -, 页码 433-442出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.11.171
关键词
Supercapacitor; Cu2O/CuO/RGO; Hydrothermal; Rate capability; Cycling stability
资金
- National Natural Science Foundation of China [20504026]
- Shanghai Natural Science Foundation [13ZR1411900]
- Shanghai Leading Academic Discipline Project [B502]
- Shanghai Key Laboratory Project [08DZ2230500]
- EU FP7 Staff Exchange program [PIRSES-GA-2012-318990-ELEKTRONANOMAT]
A reduced graphene oxide (RGO)-based nanocomposite of redox counterpart of the oxides of Cu(I)-Cu(II) pair for Faradaic reaction, Cu2O/CuO/RGO, was controllably synthesized through a facile, eco-friendly one-step hydrothermal-assisted redox reaction of elemental Cu and graphene oxide (GO) without the addition of any other reagents. The resultant Cu2O/CuO/RGO nanocomposites were characterized by X-ray diffraction (XRD), Raman spectroscopy, Thermogravimetric analysis (TG), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM). It is found that, when dealloyed nanoporous Cu was used as a Cu source, the uniform spherical Cu2O/CuO nanoparticles with double size scales (similar to 25 nm and similar to 5 nm) were anchored on RGO sheets. This Cu2O/CuO/RGO nanocomposite redox counterpart exhibits improved rate capability and excellent cycling stability, i.e., only ca. 21.4% of the capacity was lost when the discharge current density increases from 1 A g(-1) (173.4 F g(-1)) to 10 A g(-1) (136.3 F g(-1)). Especially, the capacity remains almost unchanged (98.2%) after 100,000 cycles at 10 A g(-1). The good electrochemical performance and simple accessibility prove that this Cu2O/CuO/RGO composite consisting of a pair of redox counterparts is a promising material for supercapacitor applications. (C) 2014 Elsevier Ltd. All rights reserved.
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