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Pseudocapacitive anthraquinone modified with reduced graphene oxide for flexible symmetric all-solid-state supercapacitors
Carbon ( IF 10.9 ) Pub Date : 2018-02-01 , DOI: 10.1016/j.carbon.2017.11.003
Lei Xu , Ruiying Shi , Hongfei Li , Cuiping Han , Mengyao Wu , Ching-Ping Wong , Feiyu Kang , Baohua Li

Abstract Pseudocapacitive materials with high capacitance are promising for enabling high energy density supercapacitors (SCs). Herein, 1, 4, 5, 8 tetrahydroxy anthraquinone (THAQ) with rich carbonyl groups is explored as a novel redox-active electrode material for SCs. THAQ is uniformly anchored on conductive reduced graphene oxide (rGO) sheets by π-π aromatic interactions and a robust, flexible THAQ/graphene composite electrode on filter paper is prepared by a vacuum-filtration method. The filter paper scaffold guarantees the high mechanical strength, meanwhile the conductive graphene sheets serve as an electronic transport medium for THAQ to ensure its remarkable pseudocapacitance. The THAQ/rGO composite achieves a specific capacitance 259 F g−1 at 1 A g−1 and a capacitance retention of 97.9% after 10,000 cycles at 20 A g−1. Moreover, the flexible electrode exhibits a sharp decrease in the charge transfer resistance (Rct = 2.3 Ω for the THAQ:rGO ratio of 1:1) in comparison with that of pure THAQ (Rct = 1063 Ω) and a high areal capacitance of 122.7 mF cm−2 at a current density of 0.1 mA cm−2, as well as a long cycle life (81.8% after 2000 cycles at 1 mA cm−2), providing a good solution to solve the low electronic conductivity issue currently plagued in quinone-based electrode materials.

中文翻译:

用还原氧化石墨烯修饰的伪电容性蒽醌用于柔性对称全固态超级电容器

摘要 具有高电容的赝电容材料有望用于实现高能量密度超级电容器 (SC)。在此,研究人员探索了具有丰富羰基的 1, 4, 5, 8 四羟基蒽醌 (THAQ) 作为一种新型的 SCs 氧化还原活性电极材料。THAQ 通过 π-π 芳族相互作用均匀地固定在导电还原氧化石墨烯 (rGO) 片上,并通过真空过滤方法在滤纸上制备了坚固、灵活的 THAQ/石墨烯复合电极。滤纸支架保证了高机械强度,同时导电石墨烯片作为 THAQ 的电子传输介质,以确保其显着的赝电容。THAQ/rGO 复合材料在 1 A g-1 下实现了 259 F g-1 的比电容和在 20 A g-1 下 10,000 次循环后的电容保持率为 97.9%。而且,
更新日期:2018-02-01
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