水葫芦衍生的层次型多孔活性炭作为超级电容器中性能优异的电极材料

Shraban Dey, Anjan Chakraborty, Mir Wasim Raja, Lal Gopal Das, Naresh Chandra Murmu and Tapas Kuila*, 
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引用次数: 0

摘要

活性炭(AC)作为一种经济高效的超级电容器电极材料,因其具有较大的表面积和多孔结构而受到越来越多的关注。优化活化保温时间等因素是获得高比表面积和分层孔隙的关键。本文以常见生物废弃物水葫芦为原料,采用KOH活化法制备了不同保温时间(~ 0.5、1.5和2.5 h)的AC,研究其对比表面积和比电容的影响。HAC2(激活保持时间1.5 h)的表面积增加了约540 m2 g-1。最佳的HAC2电极在1 a g-1时具有高达323 F - 1的高比电容。考虑到实用性的角度,HAC2被用作水和有机对称超级电容器器件的电极材料,在0.5 a g-1下实现了~ 173和34 F g-1的比电容。为了实现高比电容和高电位窗口,组装了MoO3//HAC2器件。该器件在0.5 a g-1下具有高达~ 104 F - 1的高比电容,在351 W kg-1功率密度下具有28.58 W h kg-1的卓越能量密度,并且在10,000次循环后容量保持率为~ 86%。该装置可以为数字时钟和LED供电,这表明它有可能用作储能装置。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Water Hyacinth-Derived Hierarchical Porous Activated Carbon as a Supreme Electrode Material Toward the Stellar Performance in Supercapacitor Applications

Water Hyacinth-Derived Hierarchical Porous Activated Carbon as a Supreme Electrode Material Toward the Stellar Performance in Supercapacitor Applications

Activated carbon (AC) is gaining more attention as a cost-effective, efficient electrode material for supercapacitors due to its larger surface area and porous structure. Optimizing factors like activation holding time is the key to achieving AC with high surface area and hierarchical pores. Herein, AC from water hyacinth, a common biowaste, was prepared using the KOH activation process, with varied holding times (∼0.5, 1.5, and 2.5 h) to study their impact on surface area and specific capacitance. HAC2 (activation holding time 1.5 h) exhibited an elevated surface area of ∼540 m2 g–1. The optimal HAC2 electrode afforded a high specific capacitance of ∼323 F g–1 at 1 A g–1. Considering a practicability perspective, HAC2 was used as an electrode material in aqueous and organic symmetric supercapacitor devices, achieving specific capacitances of ∼173 and 34 F g–1 at 0.5 A g–1. To achieve a high specific capacitance and a high potential window, the MoO3//HAC2 device was assembled. This device achieved a high specific capacitance of ∼104 F g–1 at 0.5 A g–1 with an outstanding energy density of 28.58 W h kg–1 at 351 W kg–1 power density and a capacity retention of ∼86% after 10,000 cycles. The developed device can power a digital clock and an LED, indicating that it can be potentially used as an energy storage device.

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