The objective of this research is to synthesize TiO2 nano-structured thin films with properties tailored for the photoreduction of CO2 to CH4 under UV and visible light. Our efforts are guided by the objectives of (a) creating a high number of photoactive sites, (b) optimizing charge separation, and (c) increasing response to visible light for improved photo-efficiency. Unbalanced reactive dc magnetron sputtering with partial pressure control of oxygen is utilized to fabricate mixed-phase TiO2 films with novel nanostructures, high solid-solid interfacial areas and enhanced oxidative and reductive activities. Recent studies have focused on cation substation (Nb) in titania to influence photoresponse and photocatalytic performance. We will report on the structural and functional characterization of these films, including: optical response, charge carrier-density, recombination rates, and photocatalyic performance for photo-oxidation and photo-reduction. We will also report on the photoactivity of graphene/Nb:TiO2 composites.
ASJC Scopus subject areas
- Chemical Engineering(all)