Xingyue Wu,Baozhu Yang,Yiping Qiu,Junyao Li,Yong Qin,Yong Kong
Three-dimensional (3D) Mo-doped CuCoSe (Mo-CuCoSe) nanoflowers and zero-dimensional (0D) CdSe nanodots are successively grown on the surface of one-dimensional (1D) CuO nanowires through a two-step electrodeposition strategy. As the supporting matrix, the 1D CuO nanowires can greatly alleviate the aggregation of the Mo-CuCoSe. The 3D Mo-CuCoSe nanoflowers show unique hydrangea-like structure, which can not only enhance the diffusion of electrolyte ions/electrons, but also facilitate the Faraday redox reactions. The 0D CdSe nanodots play a pivotal role in the enhancement of capacitance retentions. Due to the synergistic effect of CuO nanowires, Mo-CuCoSe nanoflowers and CdSe nanodots, the multi-dimensional CuO/Mo-CuCoSe/CdSe shows a high specific capacitance of 4600 mF cm −2 (at 1.0 mA cm −2 ) and excellent cyclic stability. Further, activated carbon (AC) and the multi-dimensional CuO/Mo-CuCoSe/CdSe are assembled to construct an asymmetric supercapacitor (ASC), which exhibits a maximum energy density of 30.3 Wh kg −1 at 214.2 W kg −1 .
The pursuit of novel cathode materials with excellent performance is the key to promoting the application of rechargeable magnesium batteries (RMBs). Herein, bimetallic copper-cobalt selenide (CuCo 2 Se 4 ) as a cathode material for RMBs, synthesized via a microwave-assisted method. In contrast to the monometallic selenide (Co 0.85 Se), CuCo 2 Se 4 exhibits a high reversible capacity of 108 mAh g −1 at 50 mA g −1 after 80 cycles, and a superior rate capability (90 mAh g −1 at 200 mA g −1 ). The crystal phase transition of the conversion electrode material during the cycles is analyzed using ex-situ XRD technology. The enhanced stability of bimetallic selenide provides a good experimental support for the preparation of high-performance rechargeable magnesium batteries based on bimetallic strategy.
Peiheng Sun,Jing Zhang,Jiajie Huang,Liang Wang,Peijia Wang,Chen Cai,Mixue Lu,Zhujun Yao,Yefeng Yang
As an important class of battery-type materials, transition metal selenides are widely investigated for application in hybrid supercapacitors. Herein, we report the two-step synthesis of bimetallic copper cobalt selenide nanoparticles embedded in N-doped carbon layers ((CuCo)Se/NC) by using metal-organic framework (MOF) as the functional templates. Benefitting from the Cu incorporation in CoSe matrix and integration of MOF-derived carbon layers, the optimized (CuCo)Se/NC electrode delivers a reasonably high specific capacity of 121.4 C/g at 1 A/g with outstanding rate capability and cycling stability. The full hybrid supercapacitor device based on the (CuCo)Se/NC electrode shows a maximum energy density of 16.3 Wh/kg at a power density of 155.3 W/kg with excellent long-term cycling stability over 5000 cycles.
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