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Surface-Alkalinization-Induced Enhancement of Photocatalytic H2 Evolution over SrTiO3-Based Photocatalysts
journal contribution
posted on 2012-02-01, 00:00 authored by Shuxin Ouyang, Hua Tong, Naoto Umezawa, Junyu Cao, Peng Li, Yingpu Bi, Yuanjian Zhang, Jinhua YeA 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 SrTiO3 photocatalyst to a more negative
level, supplying a strong potential for H2O reduction and
consequently promoting the photocatalytic efficiency of H2 evolution. This mechanism is also applicable for visible-light-sensitive
La,Cr-codoped SrTiO3 photocatalyst, which hence, could
achieve a high apparent quantum efficiency of 25.6% for H2 evolution in CH3OH aqueous solution containing 5 M NaOH
at an incident wavelength of 425 ± 12 nm.