Jump to main content
Jump to site search

Issue 15, 2018
Previous Article Next Article

Tailoring the oxygenated groups of graphene hydrogels for high-performance supercapacitors with large areal mass loadings

Author affiliations

Abstract

High-performance electrodes with high areal capacitances are highly desired for the practical applications of supercapacitors. Herein, we report such electrodes prepared from hydroxyl-rich graphene hydrogels (HRGHs). The hydroxyl groups on graphene sheets contribute to pseudo-capacitance and improve the wettability of HRGHs to aqueous electrolyte, ensuring fast ion transport within the electrodes, especially for the electrodes with high mass loadings. The supercapacitor based on mechanically compressed HRGHs shows a high gravimetric capacitance (260 F g−1) and volumetric capacitance (312 F cm−3) at 1 A g−1, good rate capability (∼78% at 100 A g−1), and excellent cycling stability (∼100% after 10 000 cycles). Moreover, an ultrahigh areal capacitance of 2675 mF cm−2 at 1 mA cm−2 is achieved at the mass loading of 10 mg cm−2. Even at a high current density of 50 or 100 mA cm−2, the areal capacitance is still retained at 2140 or 1768 mF cm−2, demonstrating the outstanding scalability of the HRGH electrodes.

Graphical abstract: Tailoring the oxygenated groups of graphene hydrogels for high-performance supercapacitors with large areal mass loadings

Back to tab navigation

Supplementary files

Publication details

The article was received on 11 Dec 2017, accepted on 08 Mar 2018 and first published on 10 Mar 2018


Article type: Paper
DOI: 10.1039/C7TA10843E
Citation: J. Mater. Chem. A, 2018,6, 6587-6594
  •   Request permissions

    Tailoring the oxygenated groups of graphene hydrogels for high-performance supercapacitors with large areal mass loadings

    H. Ma, Q. Zhou, M. Wu, M. Zhang, B. Yao, T. Gao, H. Wang, C. Li, D. Sui, Y. Chen and G. Shi, J. Mater. Chem. A, 2018, 6, 6587
    DOI: 10.1039/C7TA10843E

Search articles by author

Spotlight

Advertisements