Microwave-assisted synthesis of functionalized graphene hydrogels for high performance supercapacitors

被引:8
作者
Li, Shucun [1 ,2 ]
Guo, Chengxiao [1 ]
Qiao, Yuqing [2 ]
机构
[1] Yanshan Univ, Hebei Key Lab Heavy Met Deep Remediat Water & Res, Hebei Key Lab Appl Chem, Coll Environm & Chem Engn, Qinhuangdao 066004, Hebei, Peoples R China
[2] Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Hebei, Peoples R China
来源
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS | 2021年 / 273卷
基金
中国国家自然科学基金;
关键词
Microwave; Functionalized graphene; Hydrogel; Supercapacitors; OXIDE; REDUCTION; CARBON; MACROSTRUCTURES; EXFOLIATION;
D O I
10.1016/j.mseb.2021.115407
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The electrochemical properties of graphene-based electrode materials for supercapacitors are closely related to their structure and chemical properties. The functionalized graphene (FG) was prepared with microwaveassisted. The functionalized graphene hydrogel (FGH) was synthesized by introducing FG during the one-step hydrothermal process. The FG shows the uniform paper-like structure. Further, the FGH presents double structure of clear three dimensional (3D) networks and thin wrinkled paper-like structure. The introduction of FG can effectively prevent the accumulation between graphene sheets and the layered three-dimensional framework can accelerate ion transport and diffusion. Consequently, the proposed FGH exhibits a high specific capacitance of 340.2 F.g(-1) at the current density of 0.5 A.g(-1), which can be maintained for 82.1% even as the discharging current density increases up to 10 A.g(-1). Moreover, excellent stability is achieved for FGH with approximately 97.3% retention of the initial specific capacitance value after 20,000 cycles, measured at a high current density of 10 A.g(-)1. These imply that the FGH may be a promising electrode material for high-performance supercapacitors.
引用
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页数:7
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