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Published on: June 28, 2017
Photoelectrochemical performances of MoO2/TiO2 nanotube array (TNA) heterojunctions synthesized by SILAR method
Dzulhijjah Nur Meisinca1, Sherly Kasuma Warda Ningsih1
1Department of Chemistry, Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang Kampus Air Tawar Padang 25132 Indonesia sherly14@fmipa.unp.ac.id.
Abstract:
MoO2/TiO2 nanotube arrays (TNAs) were synthesized by the SILAR (successive ionic layer adsorption and reaction) method via the addition of ascorbic acid as a reductor. TNAs were synthesized using a two-step anodization method on Ti foil. Characterization was performed using UV-Vis DRS, XRD, Raman spectroscopy, and FESEM-EDX. Characterization results showed that MoO2 modification reduced the band gap from 3.21 eV to 1.56 eV, expanding light absorption into the visible region. Photoelectrochemical tests using a potentiostat with LSV and MPA methods showed that the MoO2/TNAs electrode had a higher current density than pure TNAs, indicating increased charge separation efficiency and photoelectrocatalytic activity.
