期刊
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
卷 895, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2021.115402
关键词
Redox active organic molecule; Emodin; Graphene; Non-covalent functionalization; Supercapacitor
资金
- Doctor Foundation of Long-dong University [XYBY202017, XYBY1903]
- Key Discipline of Gansu Province
- Innovation Team Project of Gansu University [2018C22]
- National Natural Science Foundation of China [21773187, 21563027]
Emodin, a natural anthraquinone derivative with high redox activity, was anchored on graphene sheet to form a composite electrode material with high specific capacitance. An asymmetric supercapacitor (ASC) was fabricated using this material, achieving high energy density and power density, capable of lighting up a LED. The good matching of positive and negative electrode materials in the supercapacitor greatly enhances its capacitive performance.
Emodin is a natural anthraquinone derivative and contains abundant hydroxyl and carbonyl groups, which has high redox activity. As guest molecules, Emodin molecules were anchored on graphene sheet (GNS) by simple one-step reflux method. In the three-electrode system, the optimal composite electrode material (E@GNS) obtained the high specific capacitance of 338.9 F g-1 at 5 mV s-1 and excellent rate capability in 1 mol L-1 H2SO4. Finally, an asymmetric supercapacitor (ASC) was fabricated by using E@GNS as negative electrode and Caffeic acid non-covalently modified graphene hydrogel (GH-CFA) as positive electrode, respectively. The device achieved the energy density of 32.8 Wh kg-1 along with power density of 0.8 kW kg-1, and a lightemitting diode (LED) could be light up by two ASCs in series. To compare with the performance of ASC, we also assembled symmetric supercapacitor based on E@GNS, proving that the good matching of positive and negative electrode materials could make the supercapacitor exhibit the best capacitive performance.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据