کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6465761 | 1422956 | 2017 | 12 صفحه PDF | دانلود رایگان |
- The self-assembled unique microstructures were obtained by a hydrothermal method.
- CoNi2S4-µflower arrays showed a high specific capacitance of 2098.95 F gâ1.
- Asymmetric supercapacitor designed with Ni3S2-nanorod and CoNi2S4-µflower arrays.
- Ni3S2//CoNi2S4 delivers energy density of 6.6 Wh kgâ1 at a power of 820 W kgâ1.
In this study, Ni3S2-nanorod and CoNi2S4-microflower structures have been prepared using a simple one-step hydrothermal method. The complete absence of an additive polymeric binder enabled the electrode to obtain structural purity and excellent electrochemical activity. The formation of the nanorod and micro flowers (µflowers) was clearly visualized by the surface microstructural study. Ni3S2-nanorod and CoNi2S4-µflower electrodes show a significantly higher specific capacitance of 982.9 F gâ1 and 2098.95 F gâ1, respectively, with outstanding electrochemical cyclic stability performance. The CoNi2S4-µflower electrode can achieve an energy density of 82.98 Wh kgâ1 with a power density of 9.63 kW kgâ1. In addition, a 91% capacitive retention remains after 2000 cycles at a scan rate of 100 mV sâ1. The designed hybrid asymmetric supercapacitor, based on Ni3S2-nanorod//CoNi2S4-µflower electrodes, exhibits a specific capacitance of 54.92 F gâ1 at a scan rate of 5 mV sâ1. The assembled asymmetric supercapacitor has an energy density of 6.6 Wh kgâ1 while delivering a power density of 820 W kgâ1. The capacitive retention of the initial capacitance remains desirable at 89.13% after 5000 CV cycles at a scan rate of 100 mV sâ1. The present work manifests a vision for the fabrication of self-assembled, binder-free electrodes for high-performance hybrid supercapacitor application.
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Journal: Chemical Engineering Journal - Volume 322, 15 August 2017, Pages 498-509