WO3-TiO2 Nanotubes Film for Solar Hydrogen Generation via Water ElectrolysisName : Dr. Lai Chin Wei
Affliation : Deputy Vice Chancellor
University : Institute of Graduate Studies (IGS)
Country : Malaysia
Nowadays, serious environmental pollution and energy crisis are the most threatening problems to human kinds. Therefore, executing research for generating clean energy has been the passion for scientists, which can provide us energy in sustainable manner. In this manner, custom designed water splitter pumps out clean hydrogen gas for better hydrogen power performance is one of the most innovative solutions to supply recyclable hydrogen energy. The design and development of WO3- loaded TiO2-based nanostructure film has gained significant interest in order to maximize specific surface area for harvesting more photons under solar energy. Based on our preliminary results, the incorporation of WO3 into lattice of TiO2 photocatalyst showed the promising performance. The coupling TiO2 with small band-gap of WO3 that possess different redox energy level for their valence band and conduction band, which provides another attractive approach to achieve more efficient charge separation under visible light. This condition will lead to additional electronic state in the band-gap, which in turn affect a change in the optical, electronic and functionality of TiO2. It was found that the synthesized WO3- loaded TiO2-based nanostructure film demonstrated a maximum photocurrent density of ≈ 2.5 mA/cm2 with photoconversion efficiency ≈ 6 %. The resultant photoelectrochemical performance was approximately two times higher than that of pure TiO2 nanotubes film under solar illumination. The mediator of W6+ species will assist in trapping the photo-induced electrons and minimize the recombination of charge carriers during water electrolysis process.
Keywords: recyclable hydrogen energy; water electrolysis; solar illumination; water splitting
Dr. LAI CHIN WEI is a senior lecturer in the Nanotechnology & Catalysis Research Centre, University of Malaya. He received his Ph.D (2013) from School of Materials and Mineral Resources Engineering, University of Science Malaysia in nanomaterials and nanoscience. Lai’s main research interests are in the areas of chemically modified metal oxide photocatalysts and graphene materials, especially apply in environmental pollution management and solar energy technology. Lai has contributed immensely to the development and enhancement in science & technology in Malaysia, particularly in developing, optimizing and simplifying the technology lies in the synthesis of nanoparticles, metal oxide nano-architecture and carbon/graphene materials which are of high significance for green energy and environment applications.