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Highly Redox-active Oligomers between Graphene Sheets as Ultrahigh Capacitance/Rate and Stable Electrodes for Supercapacitors
Energy Storage Materials ( IF 18.9 ) Pub Date : 2023-05-22 , DOI: 10.1016/j.ensm.2023.102824
Zhipeng Qiu , Zheng Liu , Guanwen Wang , Chao Huangfu , Zhiyuan Li , Yingchun Yan , Chunlei Chi , Pengfei Gao , Xiaolong Lu , Su Zhang , Tong Wei , Zhuangjun Fan

Organic electrodes have emerged as promising candidates for supercapacitors due to their sustainability, structural diversity, and high electrochemical activity. However, the intrinsic poor electronic conductivity and solubility in electrolytes impede their further applications. Herein, we propose a facile strategy for the synthesis of pyrogallic (PG) oligomer confined in-between graphene layers (FRGO) as high-performance electrodes for supercapacitors. The PG oligomer exhibits both physiochemical properties of small molecules and organic polymers, such as fast reaction kinetics and structural stability in aqueous electrolyte. Conjugated sp2 carbon plane with abundant electroactive groups (-OH and -C=O) possess high electrochemical activity and construct fast electron transfer tunnels crossing the longitudinal graphene layers. Accordingly, FRGO delivers an excellent rate performance (835 F g−1 at 0.5 A g−1, 233 F g−1 at 200 A g−1) and ultra-long cycle stability. The symmetric supercapacitor exhibits an ultra-high energy density of 82.4 Wh kg−1 at 300 kW kg−1, dramatic power density of 90 kW kg−1 at 4 Wh kg−1, and remarkable stability of 90% retention after 20000 cycles. This work may open a new window for the rational design of organic oligomers in energy storage and conversion fields.



中文翻译:

石墨烯片之间的高氧化还原活性低聚物作为超级电容器的超高电容/倍率和稳定电极

由于其可持续性、结构多样性和高电化学活性,有机电极已成为超级电容器的有前途的候选者。然而,固有的较差的电子导电性和在电解质中的溶解度阻碍了它们的进一步应用。在此,我们提出了一种简单的合成策略,用于合成限制在石墨烯层(FRGO)之间的焦没食子酸(PG)低聚物作为超级电容器的高性能电极。PG低聚物表现出小分子和有机聚合物的物理化学性质,例如在水性电解质中的快速反应动力学和结构稳定性。共轭sp 2具有丰富电活性基团(-OH 和 -C=O)的碳平面具有高电化学活性并构建穿过纵向石墨烯层的快速电子转移隧道。因此,FRGO 具有出色的倍率性能(0.5 A g -1时为 835 F g -1,200 A g -1时为233 F g -1)和超长循环稳定性。对称超级电容器在 300 kW kg -1时表现出 82.4 Wh kg -1的超高能量密度,在 4 Wh kg -1时表现出惊人的 90 kW kg -1功率密度, 并且在 20000 次循环后保持 90% 的显着稳定性。这项工作可能为能量存储和转换领域中有机低聚物的合理设计打开一扇新窗口。

更新日期:2023-05-22
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