Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6612580 | Electrochimica Acta | 2015 | 30 Pages |
Abstract
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 (â¼25Â nm and â¼5Â 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 1Â AÂ gâ1 (173.4Â FÂ gâ1) to 10Â AÂ gâ1 (136.3Â FÂ gâ1). Especially, the capacity remains almost unchanged (98.2%) after 100,000 cycles at 10Â AÂ gâ1. 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.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Kun Wang, Xiangmao Dong, Chongjun Zhao, Xiuzhen Qian, Yunlong Xu,