Visible-light-induced hydrogen production over Pt-Eosin Y catalysts with high surface area silica gel as matrix

• Published in: Journal of power sources 2007-03, Vol.166 (1), p.74-79
• Main Authors: Zhang, Xiaojie, Jin, Zhiliang, Li, Yuexiang, Li, Shuben, Lu, Gongxuan
• Format: Article
• Language: English
• Subjects: Alternative fuels. Production and utilization; Applied sciences; Energy; Eosin Y; Exact sciences and technology; Fuels; Hydrogen; Hydrogen evolution; Miscellaneous; Natural energy; Photosensitized; Silica gel; Solar energy; Visible-light irradiation
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2006.12.082

A new system for the production of hydrogen, constructed using silica gel as a matrix, Eosin Y as a photosensitizer, and Pt as a cocatalyst, has been reported. It was found that the rate of photosensitized hydrogen evolution in the presence of silica gel is enhanced about 10-fold relative to the homogeneous phase, i.e. in the absence of silica gel. The pH value of the solution and the concentration of Eosin Y have remarkable effects on the rate of hydrogen evolution. The optimal pH and concentration of Eosin Y are 7 and 3.60 × 10 −4 mol dm −3 (E/S = 1/3) to 7.24 × 10 −4 mol dm −3 (E/S = 1/1), respectively. Triethanolamine (TEOA) as an electron donor, the rate of hydrogen evolution and the apparent quantum efficiency in the silica gel system under visible-light irradiation ( λ ≥ 420 nm) can reach about 43 μmol h −1 and 10.4%, respectively. In addition, the roles of silica gel, Pt and TEOA, respectively; and the probable mechanism of photosensitized hydrogen evolution have been discussed.