Senthilkumar S T, Kalai Selvan R
Solid State Ionics and Energy Devices Laboratory, Department of Physics, Bharathiar University, Coimbatore, 641 046, India.
Phys Chem Chem Phys. 2014 Aug 7;16(29):15692-8. doi: 10.1039/c4cp00955j.
In the present work a novel cable-type asymmetric supercapacitor was fabricated using plate-like β-Ni(OH)2 as the positive and activated carbon as the negative electrode, with polyvinyl alcohol-KOH (PVA-KOH) as the gel polymer electrolyte. The β-Ni(OH)2 plates were prepared by a reflux method and the activated carbon was derived from Tamarindus indica fruit shell by chemical activation. The working voltage of the fabricated cable-type asymmetric supercapacitor (ASC) was 1.4 V, and it achieved per-unit-length and gravimetric capacitances of 40.7 mF cm(-1) and 37.5 F g(-1) respectively at 2 mA. Besides, the fabricated ASC delivered a maximum per-unit-length (gravimetric) energy density of 10.7 μW h cm(-1) (9.8 W h kg(-1)) at a power density of 169 μW cm(-1) (154 W kg(-1)). In addition, it exhibited a better capacitance retention, of 88% over 1000 cylces and 76% over 2000 cycles.
在本工作中，使用片状β - 氢氧化镍作为正极、活性炭作为负极，并以聚乙烯醇 - 氢氧化钾（PVA - KOH）作为凝胶聚合物电解质，制备了一种新型的缆式不对称超级电容器。β - 氢氧化镍板通过回流法制备，活性炭由罗望子果壳经化学活化得到。所制备的缆式不对称超级电容器（ASC）的工作电压为1.4 V，在2 mA时其单位长度电容和质量比电容分别达到40.7 mF cm⁻¹和37.5 F g⁻¹。此外，所制备的ASC在功率密度为169 μW cm⁻¹（154 W kg⁻¹）时，单位长度（质量比）最大能量密度为10.7 μW h cm⁻¹（9.8 W h kg⁻¹）。此外，它表现出较好的电容保持率，在1000次循环中为88%，在2000次循环中为76%。
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