Deposition of molybdenum oxide in nanoporous titanium oxide template - modified with - composition, electrical and optical properties
Abstract
Nanoporous titanium oxides are synthesized using a galvanostatic-tensiostatic method in electrolytes based on ethylene glycol solvent with water and ammonium fluoride additions. The porosity of the oxides is estimated by re-anodization in a suitable non-dissolving electrolyte, their optical properties are assessed using diffuse reflectance spectroscopy. Modification of the titanium oxides via electrodeposition of molybdenum oxide in potentiodynamic conditions results in the formation of a non-stoichiometric oxide containing mainly Mo(V), substantial amounts of Mo(VI) and lesser quantities of Mo(IV). The conduction mechanism in such oxides was studied by electrochemical impedance spectroscopy. Diffuse reflectance measurements indicate a greatly improved absorption of visible light in comparison with nanoporous TiO2 which points to prospective photocatalytic abilities of the modified oxides.
- Publication:
-
Applied Surface Science
- Pub Date:
- August 2018
- DOI:
- 10.1016/j.apsusc.2018.04.074
- Bibcode:
- 2018ApSS..448..331B
- Keywords:
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- Nanoporous titanium oxide;
- Porosity;
- Electric and optical properties;
- Molybdenum oxide;
- Visible light absorption