کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6470349 | 1424105 | 2017 | 12 صفحه PDF | دانلود رایگان |
- CoMoO4/Co9S8 nanorod arrays on Ni foam was synthesized by hydrothermal route.
- CoMoO4/Co9S8 exhibited a superior capacitance of 9.17Â FÂ cmâ2 (2059.26Â FÂ gâ1).
- A high energy density was equal to 42 Wh kgâ1 for an asymmetric design.
CoMoO4/Co9S8 nanorod arrays supported on nickel foam are successfully assembled via a facile two-step hydrothermal route. Due to the unique nanorod array structure, the CoMoO4/Co9S8, as the electrode, possesses a high capacity 1.54 mA h·cmâ2 (343.21 mA h·gâ1) and a large capacitance 9.17 F cmâ2 (2059.26 F gâ1) at a current density of 20 mA·cmâ2 (4.44 A·gâ1), and an excellent cycling stability (8.6% degradation after 3000 cycles). The asymmetric supercapacitor based on the CoMoO4/Co9S8 nanorod arrays as a positive electrode and porous active carbon as a negative electrode in an alkaline KOH aqueous electrolyte is fabricated. Owing to the synergetic effect between CoMoO4/Co9S8 and active carbon, CoMoO4/Co9S8//active carbon asymmetric supercapacitor exhibits an outstanding energy density of 42 Wh·kgâ1 and an excellent cycling stability with 89.5% specific capacitance retained after 5000 cycles in an operating voltage of 1.6 V. The facile synthesis route and remarkable supercapacitive performance of the CoMoO4/Co9S8 nanorod arrays is promising as a positive electrode materials for high-performance asymmetric supercapacitors.
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Journal: Electrochimica Acta - Volume 252, 20 October 2017, Pages 470-481