Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4767162 | Electrochimica Acta | 2017 | 20 Pages |
Abstract
The new electrode materials with large specific capacitance, cycling stability and high rate capability are important to advance the development of supercapacitors. A nanocomposite of mesoporous MnO2 nanospheres anchered reduced graphene oxide (MG) was synthesized by a simple and inexpensive reflux reaction. KMnO4 refluxed with oxalic acid as reducing agent was used to the growth of mesoporous MnO2 nanospheres on graphene oxide (GO). The MG as an electrode exhibits a specific capacitance of 466.7Â FÂ gâ1 at a current density of 1Â AÂ gâ1, which is 3.33 times larger than that of pure MnO2 (140Â FÂ gâ1) and 3.19 times of graphene (146Â FÂ gâ1). The rate capability arrives at 10Â AÂ gâ1 with specific capacitance of 454.8Â FÂ gâ1. The capacitance retention is 92% over 2000 cycles at 1Â AÂ gâ1. The electrochemical impedance spectroscopy (EIS) demonstrates roles of mesopores and RGO in facilitating electronic transport and ionic diffusion across the pores and interfaces.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Jun Yao, Qingjiang Pan, Shanshan Yao, Limei Duan, Jinghai Liu,