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  • Surface-alkalinization-induced enhancement of photocatalytic H2 evolution over SrTiO3-based photocatalysts.

Surface-alkalinization-induced enhancement of photocatalytic H2 evolution over SrTiO3-based photocatalysts.

Journal of the American Chemical Society (2012-01-28)
Shuxin Ouyang, Hua Tong, Naoto Umezawa, Junyu Cao, Peng Li, Yingpu Bi, Yuanjian Zhang, Jinhua Ye
要旨

A strategy of reaction-environment modulation was employed to change the surface property of a semiconductor photocatalyst to enhance its photocatalytic performance. Surface alkalinization induced by a high alkalinity of the solution environment significantly shifted the surface energy band of a SrTiO(3) photocatalyst to a more negative level, supplying a strong potential for H(2)O reduction and consequently promoting the photocatalytic efficiency of H(2) evolution. This mechanism is also applicable for visible-light-sensitive La,Cr-codoped SrTiO(3) photocatalyst, which hence, could achieve a high apparent quantum efficiency of 25.6% for H(2) evolution in CH(3)OH aqueous solution containing 5 M NaOH at an incident wavelength of 425 ± 12 nm.

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Sigma-Aldrich
チタン酸ストロンチウム, powder, 99%
Sigma-Aldrich
チタン酸ストロンチウム, nanopowder, <100 nm particle size, 99% trace metals basis
Sigma-Aldrich
チタン酸ストロンチウム, single crystal substrate, <100>