The high-rate hybrid supercapacitor (HSC) has a positive electrode made from copper oxide (CuO)-cobalt oxide (CoO) core-shell nanocactus-like heterostructures produced on a nickel foam substrate, a negative electrode made by coating nickel foam with graphene ink, and a separator of cellulose paper. The heterostructures each have a core of CuO nanoflakes and a shell of CoO nanoneedles extending from the nanoflakes. The HSC achieves a specific capacity of 173.9 mA h g−1 at 1 A g−1 and long cycle life with 94% retention over 5000 cycles at 4 A g−1, and also exhibits a stable operating voltage window of 1.6 V, energy density of 56.5 W h kg−1, and cycling stability of 98.8% retention with coulombic efficiency of 98.7% over 4000 cycles.
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机译：高速杂交超级电容器（HSC）具有由在镍泡沫基材上产生的氧化铜（CuO）氧化钴（CUO）核 - 壳纳米酰胺状异质结构制成的正电极，通过将镍泡沫与石墨烯涂布镍制成的负电极 墨水和纤维素纸的隔膜。 该异质结构各自具有CuO纳米薄片的核心，以及从纳米薄片延伸的官方纳米烷基壳壳。 HSC在1A的1A-1和长循环寿命下实现173.9 mA Hg-1的特定容量，在4A G-1的94％循环中保持94％，并且还显示出1.6 V，能量密度的稳定工作电压窗口 56.5 W H KG-1，并循环稳定性为98.8％，在4000次循环中的库仑效率为98.7％。
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