Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031 (P.R. China), Fax: (+86) 0551-63861475; School of Physics and Materials Science, Anhui University, Hefei 230601 (P.R. China).
Chemphyschem. 2014 Feb 3;15(2):366-73. doi: 10.1002/cphc.201300822. Epub 2013 Dec 6.
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 F g(-1) at a current density of 1.0 A g(-1) .
多功能石墨烯水凝胶因其在实际应用中的巨大潜力而受到广泛关注。本文首次成功制备了含有还原氧化石墨烯纳米片（RGO）和 V2O5 纳米带（RGO/V2O5）的新型双功能复合水凝胶。令人惊讶的是，三维（3D）RGO/V2O5 复合水凝胶不仅可用作高性能电磁（EM）波吸收剂，而且还表现出适合超级电容器电极的优异性能。该复合材料的最大吸收值高达-21.5dB。特别是，复合水凝胶表现出 6.63GHz 的带宽，对应于-10dB 的反射损耗，这为使用具有其他功能纳米材料的 3D 石墨烯作为轻量级和高性能 EM 波吸收材料开辟了可能性。值得注意的是，该复合水凝胶在 1.0A/g 的电流密度下能够提供约 320F/g 的高比电容。
