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http://hdl.handle.net/10397/88549
Title: | Self-assembled three-dimensional macroscopic graphene/MXene-based hydrogel as electrode for supercapacitor | Authors: | Zhang, LJ Or, SW |
Issue Date: | Sep-2020 | Source: | APL materials, Sept. 2020, v. 8, no. 9, 091101, p. 091101-1-091101-7 | Abstract: | Hydrogels with unique three-dimensional (3D) macroscopic porous architectures are attractive electrode materials for supercapacitors because of their superior electrolyte permeabilities and rapid electron/ion transports. In this letter, a cylindrical-type 3D macroscopic graphene/MXene-based hydrogel (GMH) is prepared by self-assembling laminar-structured graphene oxide (GO) and MXene (Ti3C2) nanosheets via a facile one-step hydrothermal method under the existence of ammonia water and hydrazine hydrate. GO is found to self-converge into a 3D macroscopic porous graphene framework during the hydrothermal process, while Ti3C2 nanosheets are able to prevent the graphene nanosheets from self-restacking. The as-prepared GMH shows a larger specific surface area of 161.1 m(2) g(-1) and a higher pore volume of 0.5 cm(3) g(-1) in comparison with the pure graphene hydrogel. A symmetric supercapacitor utilizing GMH as electrodes exhibits high energy densities of 9.3 Wh kg(-1) and 5.7 Wh kg(-1) at different power densities of 500 W kg(-1) and 5000 W kg(-1), respectively, as well as an outstanding long-term cycle stability with no loss in capacitance in excess of 10 000 continuous charge-discharge cycles. The strategy of preparation of a 3D macroscopic GMH is expected to realize promising high-performance hydrogel electrodes based on graphene and MXene for electrochemical energy storages. | Publisher: | AIP Publishing | Journal: | APL materials | EISSN: | 2166-532X | DOI: | 10.1063/5.0015426 | Rights: | © 2020 Author(s). The following publication L. Zhang and S.W. Or, APL Mater. 8, 091101 (2020) is available at https://dx.doi.org/10.1063/5.0015426 |
Appears in Collections: | Journal/Magazine Article |
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Zhang_Self-Assembled_Electrode_Supercapacitor.pdf | 5.2 MB | Adobe PDF | View/Open |
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