Parayangattil Jyothibasu Jincy, Chen Ming-Zhu, Lee Rong-Ho
Department of Chemical Engineering, National Chung Hsing University, Taichung 402, Taiwan.
Department of Environmental Engineering, National Chung Hsing University, Taichung 402, Taiwan.
ACS Omega. 2020 Mar 20;5(12):6441-6451. doi: 10.1021/acsomega.9b04029. eCollection 2020 Mar 31.
In this study, a facile and environmentally friendly method was used to prepare a freestanding supercapacitor electrode displaying excellent areal capacitance and good cycle life performance. First, we prepared polypyrrole nanoparticles (PPyNP) through a simple chemical polymerization using the plant-derived material curcumin as a bioavailable template. A PPyNP/-CNT freestanding composite electrode of high mass loading (ca. 14 mg cm) was prepared after blending the mixtures of the prepared PPyNP and functionalized CNTs (-CNTs). The performance of the as-prepared material as a supercapacitor electrode was evaluated in a three-electrode setup using aqueous 1 M HSO as the electrolyte. The PPyNP/-CNT freestanding composite electrode exhibited a high areal capacitance of 4585 mF cm and a corresponding volumetric capacitance of 176.35 F cm at a current density of 2 mA cm. A symmetric all-solid-state supercapacitor assembled using two identical pieces of PPyNP/-CNT composite electrodes exhibited maximum areal energy and power density of 129.24 μW h cm and 12.5 mW cm, respectively. Besides, this supercapacitor device exhibited good cycle life performance, with 79.03% capacitance retention after 10,000 charge/discharge cycles. These results suggest practical applications for these PPyNP/-CNT freestanding composite electrode-based symmetric all-solid-state supercapacitors.
在本研究中，采用了一种简便且环保的方法来制备一种具有出色面积电容和良好循环寿命性能的独立式超级电容器电极。首先，我们以植物源材料姜黄素作为生物可利用模板，通过简单的化学聚合制备了聚吡咯纳米颗粒（PPyNP）。在将制备好的PPyNP与功能化碳纳米管（-CNTs）的混合物混合后，制备了高质量负载（约14 mg cm）的PPyNP/-CNT独立式复合电极。以1 M HSO水溶液为电解质，在三电极装置中评估了所制备材料作为超级电容器电极的性能。PPyNP/-CNT独立式复合电极在电流密度为2 mA cm时表现出4585 mF cm的高面积电容和相应的176.35 F cm的体积电容。使用两片相同的PPyNP/-CNT复合电极组装的对称全固态超级电容器分别表现出最大面积能量密度和功率密度为129.24 μW h cm和12.5 mW cm。此外，该超级电容器器件表现出良好的循环寿命性能，在10,000次充放电循环后电容保持率为79.03%。这些结果表明这些基于PPyNP/-CNT独立式复合电极的对称全固态超级电容器具有实际应用价值。
