Abstract
BaTi4O9 powders with improved crystal perfection and relatively large surface area were synthesized by the polymerized complex (PC) method calcined at reduced temperatures (700–1,000 °C) relative to the solid-state reaction (SSR) method. BaTi4O9 with a unique pentagonal-prism tunnel structure, combined with different cocatalysts (Pt, Ru, Ni, Cu, Co) as promoters, was investigated towards photocatalytic reactions for H2 evolution from pure water and aqueous ethanol solution. Pt/BaTi4O9 achieved the highest activity from ethanol solution, and subsequently it was focused to study the effect of calcination temperature on photocatalytic activities. The maximum quantum yield for H2 evolution from pure water and ethanol solution was obtained at 700 and 800 °C separately, with the value of 0.9% and 11.7% over Pt/BaTi4O9 photocatalysts.
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