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Graphene metal oxide composite supercapacitor electrodes
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Scanning electron microscopy (SEM) image of Co3O4 nanowires grown on silicon substrate. (b) MnO2 nanowires drop-casted and dried onto silicon substrate.

Image of FIG. 2.
FIG. 2.

(a) SEM image of Co3O4 flower-like nanostructures grown on silicon substrate. (b) MnO2 urchin-like nanostructures drop-casted and dried onto silicon substrate.

Image of FIG. 3.
FIG. 3.

Raman spectra comparing pristine MnO2 and Co3O4 to a Co3O4/MnO2 nanostructure composite. A sharp sign (#) denotes the characteristic MnO2 components. The composite has a MnO2 loading on its surface of ∼2% by weight.

Image of FIG. 4.
FIG. 4.

(a) Cyclic voltammogram of pristine Co3O4 at 50 and 100 mV/s scan rate respectively in 1 M KOH (Ag/AgCl reference electrode). (b) Cyclic voltammogram of Co3O4/MnO2 nanostructure composite at 100 mV/s scan rate in 1 M KOH with (Ag/AgCl reference electrode).

Image of FIG. 5.
FIG. 5.

(a) SEM image of graphene oxide from exfoliated GO obtained from modified Hummer’s method and drop-casted onto silicon substrate. (b) Reduced graphene oxide film electrophoretically deposited onto a stainless steel (SS 316) substrate, followed by chemical reduction using NaBH4.

Image of FIG. 6.
FIG. 6.

(a) Raman spectra of GO and rGO deposited on conductive substrate, showing the relative ratio of D- to G-band change from 0.7 to 2.6. (b) FTIR spectra show higher intensity band of C–O stretch at 1100 cm−1 in rGO.

Image of FIG. 7.
FIG. 7.

Cyclic voltammogram of graphene at scan rate of 100, 200, and 500 mV/s in 1 M KOH with (Ag/AgCl reference electrode), the measured specific capacitance for a scan rate of 100 mV/s is 117 F/g.

Image of FIG. 8.
FIG. 8.

SEM image of close interfacial interactions between self-assembled monolayer of MnO2 and graphene oxide film, (a) low magnification, (b) high magnification.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Graphene metal oxide composite supercapacitor electrodes