High-performance supercapacitor of macroscopic graphene hydrogels by partial reduction and nitrogen doping of graphene oxide. (10th December 2016)

• Record Type: Journal Article
• Authors: Zhang, Yong; Wen, Guangwu; Gao, Peng; Bi, Sifu; Tang, Xiaofu; Wang, Dong
• Is Part Of: Electrochimica acta. Volume 221(2016)
• Page Start: 167
• Page End: 176
• Publication Date: 2016-12-10
• Subjects: graphene -- hydrogel -- partial reduction -- nitrogen- and oxygen-containing -- supercapacitors; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2016.10.115
• Languages: English
• ISSNs: 0013-4686

Abstract

Highlights: The 3D macroscopic graphene hydrogels (MGHs) were synthesized by hydrothermal method. Combined effect of nitrogen- and oxygen-containing functional Groups in MGHs. The MGHs exhibits good rate capability and cycling stability. Abstract: In this work, the 3D macroscopic graphene hydrogels (MGHs) with a high capacitor performance were easily prepared by a one-step hydrothermal method from graphene oxide (GO) dispersions. A very small amount of 1, 4-butanediamine was employed to realize the partial reduction of GO, modification of the 3D structure of MGHs, and nitrogen doping of graphene, at the same time. The synthesized MGH-6 sample in the wet state exhibit a high specific capacitance of 268.8 Fg −1 at 0.3 A g −1 in 6 M KOH electrolyte, and this capacitance can be maintained for 84.9% even as the discharging current density was increased up to 10 A g −1 . The MGH-6 sample also shows good cycle stability along with a 1.03% increase of its initial specific capacitance after 10000 cycles at current density of 10 Ag −1 . These remarkable properties are ascribed to the both nitrogen- and oxygen-containing functional groups, modified macroporous 3D framework, and the high specific surface area of the graphene. Combining with the economical and easy path toward mass production, the present MGH-6 can be expected as a promising candidate for high-performance supercapacitors.