Au Nanoparticles Supported on BiVO4: Effective Inorganic Photocatalysts for H2O2 Production from Water and O2 under Visible Light

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• 作者：Hiroaki Hirakawa ; Shingo Shiota ; Yasuhiro Shiraishi ; Hirokatsu Sakamoto ; Satoshi Ichikawa ; Takayuki Hirai
• 刊名：ACS Catalysis
• 出版年：2016
• 出版时间：August 5, 2016
• 年：2016
• 卷：6
• 期：8
• 页码：4976-4982
• 全文大小：446K
• 年卷期：0
• ISSN：2155-5435

文摘

The design of a safe and sustainable process for the synthesis of hydrogen peroxide (H₂O₂) is a very important subject from the viewpoint of green chemistry. Photocatalytic H₂O₂ production with earth-abundant water and molecular oxygen (O₂) as resources is an ideal process. A successful system based on an organic semiconductor has been proposed; however, it suffers from poor photostability. Here we report an inorganic photocatalyst for H₂O₂ synthesis. Visible light irradiation (λ >420 nm) of the semiconductor BiVO₄ loaded with Au nanoparticles (Au/BiVO₄) in pure water with O₂ successfully produces H₂O₂. The bottom of the BiVO₄ conduction band (0.02 V vs NHE, pH 0) is more positive than the one-electron reduction potential of O₂ (−0.13 V) while more negative than the two-electron reduction potential of O₂ (0.68 V). This thus suppresses one-electron reduction of O₂ and selectively promotes two-electron reduction of O₂, resulting in efficient H₂O₂ formation.