Non-covalently functionalizing a graphene framework by anthraquinone for high-rate electrochemical energy storage

被引：77

作者：

An, Ning ^{[1
]}

Zhang, Fuhai ^{[1
]}

Hu, Zhongai ^{[1
]}

Li, Zhimin ^{[1
]}

Li, Li ^{[1
]}

Yang, Yuying ^{[1
]}

Guo, Bingshu ^{[1
]}

Lei, Ziqiang ^{[1
]}

机构：

[1] Northwest Normal Univ, Key Lab Ecoenvironm Related Polymer Mat, Key Lab Polymer Mat Gansu Prov, Minist Educ,Coll Chem & Chem Engn, Lanzhou 730070, Gansu, Peoples R China

来源：

RSC ADVANCES | 2015年 / 5卷 / 30期

基金：

中国国家自然科学基金;

关键词：

HIGH-PERFORMANCE SUPERCAPACITORS; COMPOSITE ELECTRODES; CARBON NANOTUBES; GRAPHITE OXIDE; COVALENT; DENSITY; SHEETS; POLYMERIZATION; POLYANILINE; DISPERSIONS;

D O I：

10.1039/c4ra16092d

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Anthraquinone (AQ) molecules with electrochemically reversible redox couples (anthraquinone/anthracenol) have been selected to functionalize a graphene framework (GF) through non-covalent modification. The pi-pi stacking interactions between components induce a favorable molecular orientation so that the aromatic ring of AQ is parallel to the sp(2) network of GF. In this case, the fast Faradaic reactions between anthraquinone and anthracenol generate additional pseudocapacitance for enhancing the supercapacitive performance of GF. In the three-electrode configuration, AQ-functionalized GF (AQ/GF) shows a high capacitance value (396 F g(-1) at 1 A g(-1), two times higher than bare GF), ultrahigh rate capability (64% capacitance retention at 100 A g(-1)) and long cycle life (97% retention after 2000 cycles). For further practical application, a novel asymmetric supercapacitor with high energy and power densities has been assembled by using AQ/GF as negative electrode and GF as positive electrode in H2SO4 aqueous electrolyte. Maximum energy (13.2 Wh kg(-1)) and power (9175.3 W kg(-1)) densities have been obtained for the GF//AQ/GF device.

引用

页码：23942 / 23951

页数：10

共 58 条

[21] A new type of high energy asymmetric capacitor with nanoporous carbon electrodes in aqueous electrolyte [J].