Tin Oxide/Vertically Aligned Graphene Hybrid Electrodes Prepared by Sonication-Assisted Sequential Chemical Bath Deposition for High-Performance Supercapacitors

Abstract

Hybrid electrodes comprising metal oxides and vertically aligned graphene (VAG) are promising for high-performance supercapacitor applications because they enhance the synergistic effect owing to the large contact area between the two constituent materials. However, it is difficult to form metal oxides (MOs) up to the inner surface of a VAG electrode with a narrow inlet using conventional synthesis methods. Herein, we report a facile approach to fabricate SnO 2 nanoparticle-decorated VAG electrodes (SnO 2 @ VAG) with excellent areal capacitance and cyclic stability using sonicationassisted sequential chemical bath deposition (S-SCBD). The sonication treatment during the MO decoration process induced a cavitation effect at the narrow inlet of the VAG electrode, allowing the precursor solution to reach the inside of the VAG surface. Furthermore, the sonication treatment promoted MO nucleation on the entire VAG surface. Thus, the SnO 2 nanoparticles uniformly covered the entire electrode surface after the S-SCBD process. SnO 2 @VAG exhibited an outstanding areal capacitance (4.40 F cm −2 ) up to 58% higher than that of VAG electrodes. The symmetric supercapacitor with SnO 2 @VAG electrodes showed an excellent areal capacitance (2.13 F cm −2 ) and a cyclic stability of 90% after 2000 cycles. These results suggest a new avenue for sonication-assisted fabrication of hybrid electrodes in the field of energy storage.

Environmentally Friendly Water-Based Reduced Graphene Oxide/Cellulose Nanofiber Ink for Supercapacitor Electrode Applications

“…The CV curves of all samples at different scan rates are shown in Figure S2. It can be seen that, with an increased scanning rate, the electrode’s current density was similar to that observed for typical electric double-layer capacitors (EDLCs) . At higher scan rate, the CV curve altered slowly to a quasi-rectangular shape because of the insufficient diffusion of the ions of the electrolyte …”

“…It can be seen that, with an increased scanning rate, the electrode's current density was similar to that observed for typical electric doublelayer capacitors (EDLCs). 36 At higher scan rate, the CV curve altered slowly to a quasi-rectangular shape because of the insufficient diffusion of the ions of the electrolyte. 37 GCD performance of the water-based film electrode was measured to analyze the capacitive performance of the electrodes.…”

Electronic Tuning of SnO2 by rGO Nanosheets for Highly Efficient Photocatalytic Hydrogen Peroxide Evolution

“…The increase in photocurrent shows that the composite material has more efficient interface transfer and better charge carrier separations. The doped content dramatically enhances the charge separation and charge transfer in the presence of light . The photocatalytic performance of synthesized samples is highly related to charge separation and absorption.…”

“…The doped content dramatically enhances the charge separation and charge transfer in the presence of light. 36 The photocatalytic performance of synthesized samples is highly related to charge separation and absorption. Considerably enhanced rGO−SnO 2 photocatalytic hydrogen peroxide production can be predicted.…”