Papers by Keyword: H₂ Evolution

Abstract: Self-assembled hierarchical Bi₂WO₆ microsphere was synthesized via a facile hydrothermal method. The fabricated Bi₂WO₆ exhibited up to 85.3% Cr(VI) reduction efficacy which was much greater than that of commercially available P25 TiO₂ nanoparticles. Furthermore, Bi₂WO₆ microsphere also produced about 1.5-fold greater H₂ quantity in water splitting compared to P25 TiO₂. The photocatalytic enhancement of Bi₂WO₆ microsphere was ascribed to its unique hierarchical porous architecture and large surface area which can improve the charge carrier quantities for redox reactions. The present study could be useful for fabricating Bi₂WO₆ photocatalyst with improved performance in environmental remediation and renewable energy applications.

Abstract: In this work, a visible photocatalytic system containing Eosin Y, multiwalled carbon nanotubes and CuO was prepared. The photocatalytic hydrogen evolution from water over this system was studied using triethanolamine (TEA) as a sacrificial reagent. The results indicated that it was an efficient photocatalyst with an average rate of H₂ evolution of 373 mmol·h^-1·g^-1 during first three hours under visible irradiation.

Abstract: Photochemical splitting of water into H2 and O2 using solar energy is process of great economic and environmental interest. In this study, we investigated novel photocatalytic compound, Na16Ti10O28, for water splitting. Na16Ti10O28 was prepared by solid-state reaction at 900 oC for 1 h. Prepared sample was characterized using powder X-ray diffraction, diffuse reflectance spectrum, and scanning electron microscopy. As-prepared Na16Ti10O28 sample is easily hydrated in water. Hydrous Na16Ti10O28 showed H2 evolution without co-catalyst.

Abstract: Visible light responsive TiO2 (Vis-TiO2) thin films were successfully developed by the radio-frequency magnetron sputtering method, and their photocatalytic activities for the water splitting reactions were investigated. Pt-loaded Vis-TiO2 thin films acted as photocatalysts to decompose water involving sacrificial reagent such as methanol or silver nitrate under visible light irradiation (λ³ 420 nm). Furthermore, the separate evolution of H2 and O2 was successfully achieved under solar light irradiation by applying these photocatalysts in a H-type glass container, which consists of two water phases separated by a TiO2 thin film and proton-exchange membrane.