Graphene Network Scaffolded Flexible Electrodes-From Lithium to Sodium Ion Batteries by Dongliang Chao

Author:Dongliang Chao
Language: eng
Format: epub
ISBN: 9789811330803
Publisher: Springer Singapore

3.2.2 Preparation of VO2@GQD Arrays

150 mg graphene oxide (GO, by a modified Hummers method) was dispersed in 20 mL DMF (under ultrasonication for 30 min). The solution was transferred into a 30 mL Teflon-lined stainless steel autoclave and heated at 200 °C for 8 h. After being cooled down naturally, the mixture was filtered using a 0.22 μm microporous membrane and the obtained brown solution was functional GQDs dispersion in DMF. The solvent of suspension was removed with the aid of a rotary evaporator at 80 °C under reduced pressure. VO2@GQD arrays can be obtained in the help of a facile electrophoresis process by dispersing the functional GQD in DI water. The above GF supported VO2 arrays were used as the substrate (working electrode) for the growth of VO2@GQD arrays, and Pt plate was used as counter electrode. And then a positive potential of 6 V for different time in the condition of ice-bath was applied to deposit functional GQDs onto the surface of VO2 arrays. Finally, the samples were annealed at 400 °C in Ar for 2 h to obtain good structure stability. As a comparison, VO2@GQD arrays were also fabricated on transparent conductive fluorine-tin-oxide (FTO) substrates using the same methods as described above. The weight increase (measured by an analytical balance, RADWAG, MYA 21, d = 1 µg) after GQDs deposition was ca. 30 µg (ca. 5% weight of VO2 arrays).

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