椰壳
超级电容器
髓
活性炭
制浆造纸工业
材料科学
碳化
废物管理
比表面积
碳纤维
复合材料
电极
环境科学
阴极
电解质
多孔性
植物
化学
工程类
电容
生物
有机化学
吸附
复合数
物理化学
作者
Thanathon Sesuk,Phontip Tammawat,Pranuda Jivaganont,Kritkaew Somton,Pimpa Limthongkul,Worawarit Kobsiriphat
标识
DOI:10.1016/j.est.2019.100910
摘要
Abstract In this study, activated carbons were synthesized from coconut coir pith, an inexpensive and abundant type of biomass in Thailand. The coconut coir pith was activated by a combined physical and chemical activation route, using NaOH-to-char ratios of 1:1, 2:1 and 3:1 by weight. A high surface area of 2056 m2 g−1 was achieved with NaOH-to-char weight ratio of 3:1. Using this activated carbon in a symmetrical cell with aqueous electrolyte, high capacitance values were achieved. The specific capacitance values obtained were 232.3 F g−1 at 0.1 A g−1 and 192.0 F g−1 at 1 A g−1. Long-term cycling tests at 0.5 A g−1 showed 95.4% capacitance retention after 5000 cycles. The high specific capacitance was attributed to the high micropore volume. The superior rate capability was from the interconnected pore structure of the activated carbon which allowed for efficient ion transport.
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