Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4767442 | Electrochimica Acta | 2017 | 8 Pages |
Abstract
The use of asymmetric supercapacitors (ASCs) with high energy density remains challenging for practical applications. In this study, three-dimensional (3D) hierarchical Ni1âxCoxMoO4âxH2O microspheres assembled with nanosheets are successfully synthesized using a cation exchange method and used as an ASC electrode material. The optimal synergistic effect of Ni and Co metal ions is obtained by controlling their molar ratio in the aqueous solution. Compared with pure NiMoO4âxH2O, the presence of Co ion promotes the redox reaction and induces rapid diffusion of electrons. As such, double-metal Ni1âxCoxMoO4âxH2O exhibits improved electrochemical performance. The developed ASC device of Ni0.67Co0.33MoO4âxH2O//AC shows excellent electrochemical properties and a specific capacitance of 114.6Â FÂ gâ1 at a current density of 1Â AÂ gâ1. The ASC also exhibits outstanding cycling life with 73.28% of the specific capacitance retained after 10000 cycles. Moreover, Ni0.67Co0.33MoO4âxH2O//AC possesses energy density as high as 40.76 Wh kgâ1 at a power density of 261.82Â WÂ kgâ1. These results indicate that the synergistic effect of Ni-Co can improve the performance of ASCs.
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Authors
Xiangdan Zhang, Shizhong Cui, Nannan Wang, Hongwei Hou, Weihua Chen, Liwei Mi,