MoO2-decorated TiO2 Nanofiber Composite as Visible-light Photocatalysts and Electrodes for Supercapacitor Applications
Vol. 55, No. 4, pp. 239-246,
Aug. 2018
10.12772/TSE.2018.55.239
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Abstract
Anchoring zero-dimensional nanoparticles on a one-dimensional nanomaterial is potentially advantageous in many applications. In this work, we successfully synthesized MoO2- decorated TiO2 nanofibers using a hydrothermal method with ethanol as a reducing agent. The samples were characterized by XRD, SEM-EDX, EPMA, Raman spectroscopy, and FT-IR. The samples were investigated for visible-light photocatalytic activity using methylene blue as a model dye. The novel MoO2-decorated TiO2 composite showed remarkably enhanced performance compared to pristine MoO2 and TiO2. The MoO2-decorated TiO2
composite also exhibited higher electrochemical capacitance than the pristine samples as electrode materials for supercapacitors. The obtained high photocatalytic activity and supercapacitance can be attributed to the synergistic effects between the MoO2 nanoparticles and TiO2 nanofibers. A maximum specific capacitance of 245.1 Fg-1, measured by cyclic voltammetry at a scan rate of 2 mV/s, was achieved in a 1 M H2SO4 aqueous solution. The electrochemical performances of pure MoO2 nanoparticles were significantly improved after adding TiO2 nanofibers. These results suggest the applicability of the MoO2-decorated
TiO2 hierarchical design for the removal of chemical pollutants and as electrode materials for supercapacitors.
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