Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6578491 | Chemical Engineering Journal | 2018 | 10 Pages |
Abstract
Rational construction of unique hierarchical nanostructured electrodes with excellent electrochemical performance is a promising solution to satisfy the increasing demand of supercapacitors with high energy density. In this work, a novel nanostructure of bowl-like MnO2 nanosheets with ultra-thin thickness (about 4â¯nm) has been successfully designed by a simple template-assisted hydrothermal method. The composition and morphology of the obtained bowl-like nanostructures have been characterized by FESEM, TEM, XRD, XPS and N2 adsorption-desorption. Such novel nanostructures present several advantages, such as large surface area, compact contacts, reduced interior space, additional electroactive sites for reversible redox reactions and short/unimpeded diffusion channels for ions/electron transport. When evaluated as electrode materials, bowl-like MnO2 nanosheets exhibit a specific capacitance of 379â¯Fâ¯gâ1 at a current density of 0.5â¯Aâ¯gâ1, a capacitance retained ratio of 60.5% from 0.5 to 10â¯Aâ¯gâ1 and 87.3% capacitance retention after 5000 cycles. Moreover, a possible mechanism for the excellent electrochemical performance of the novel bowl-like nanostructures compared with hollow particles has been systematically studied. We believe that this strategy can open up an avenue and appropriate idea for the rational construction of other transition metal oxides with high performance for the practical supercapacitor applications.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Panbo Liu, Yade Zhu, Xiaogang Gao, Ying Huang, Yi Wang, Shuyi Qin, Yiqing Zhang,