Journal
CHEMPHYSCHEM
Volume 15, Issue 2, Pages 366-373Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.201300822
Keywords
electrodes; graphene; hydrogels; nanostructures; supercapacitors
Funding
- National Nature Science Foundation of China [91022032, 21171001, 21173001, 51372004, 21371003]
- Anhui Province Key Laboratory of Environment-Friendly Polymer Materials
- Science Foundation for Excellent Youth Scholars of Higher Education of Anhui Province [2012SQRL011]
- Nature Science Foundation of Anhui Province [1308085QB43]
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Multifunctional graphene hydrogels have attracted great attention aimed at practical applications. Herein, the novel and bifunctional composite hydrogel containing reduced graphene-oxide nanosheets (RGO) and V2O5 nanobelts (RGO/V2O5) is successfully prepared for the first time. Surprisingly, tridimensional (3D) RGO/V2O5 composite hydrogels cannot only be used as high-performance electromagnetic (EM) wave absorbents; they also exhibit excellent properties suitable for supercapacitor electrodes. The composites exhibit a maximum absorption of up to -21.5 dB. In particular, a composite hydrogel showed a bandwidth of 6.63 GHz, corresponding to a reflection loss at -10 dB, which opens the possibility for the use of 3D graphene with other functional nanomaterials as lightweight and high-performance EM wave absorption materials. Remarkably, the composite hydrogel is capable of delivering a high specific capacitance of about 320 Fg(-1) at a current density of 1.0 Ag-1.
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