Flexible Asymmetric Supercapacitors Based on Well-ordered Bimetallic Nickel-cobalt Chalcogenides Nanoarray/Carbon Foam Composites
SUN Yimin, YI Ronghua, DUAN Jiqing, ZHOU Aijun
Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan 430205, China
Abstract: Aseries of flexible asymmetric supercapacitors were constructed by using carbonized melamine foam as flexible substrate, which was decorated by high-ordered nickel cobalt oxide/sulfide/selenide nanorods arrays and bismuth oxide nanosheets and used as positive and negative electrode respectively. The performance of Ni-Co selenide is better than those of oxide and sulfide, hence the as-obtained asymmetric supercapacitor shows a high area capacitance of 620.9 mF/cm2 at 1 mA/cm2, the power density and energy density are 3.75 mW/cm3 and 0.97 mWh/cm3, respectively, and the capacity retention rate of 6 000 cycles is 91.2%. After bending for 200 times, the device still maintains 88.6% of its initial capacitance. Therefore, the asymmetric supercapacitor based on Ni-Co selenide and bismuth oxide has great potential in the field of high-performance flexible energy storage devices.
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