In view of this, we investigated new visible light nanostructured semiconductor photocatalyst especially in the field of composite metal oxide photocatalyst for solar hydrogen production from H2S. For this purpose, two methodologies using a quantum mechanical material design and the microscopic surface analysis on a nanometer scale are adopted. The catalysts are synthesized by our proprietary soft chemical approaches. Also, a demonstrative reaction system for the effective solar hydrogen production is presented.
Titania nanotubes (TiNTs) with high surface area were synthesized by hydrothermal reaction under strongly basic
condition and their photocatalytic application was explored. After preparing a series of CdS-TiNT composite films with
variation of the mole ratio (r) of TiNT/(CdS + TiNT), their photocatalytic activities for hydrogen production and the
photocurrent generation under the visible light irradiation were examined. In the aspect of light absorption for the
photocatalytic reaction, the CdS-TiNT composite films revealed similar amounts of absorption to their counterparts, i.e.,
CdS-TiO2 particulate series. However, the former showed less significant synergistic effect in the photocurrent
generation and lower photocatalytic activities compared to the latter. Consequently, it appears that TiNTs are not so
effective photocatalyic material in spite of their larger surface areas rather than TiO2 nano-particles, because they
indicate a poor crystallinity and a less intimate interaction or contact with CdS particles owing to the tubular
morphology and a readily agglomeration among themselves.
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