Efficient Photocatalytic Hydrogen Peroxide Production over TiO2 Passivated by SnO2

Photocatalysis provides an attractive strategy for synthesizing H2O2 at ambient condition. However, the photocatalytic synthesis of H2O2 is still limited due to the inefficiency of photocatalysts and decomposition of H2O2 during formation. Here, we report SnO2-TiO2 heterojunction photocatalysts for...

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Bibliographic Details
Published in:Catalysts 2019-07, Vol.9 (7), p.623
Main Authors: Zuo, Guifu, Li, Bingdong, Guo, Zhaoliang, Wang, Liang, Yang, Fan, Hou, Weishu, Zhang, Songtao, Zong, Peixiao, Liu, Shanshan, Meng, Xianguang, Du, Yi, Wang, Tao, Roy, Vellaisamy A. L.
Format: Article
Language:English
Subjects:
Aqueous solutions
Catalysts
Chemical reactions
Decomposition
Electron paramagnetic resonance
Electron spin
H2O2
Heterojunctions
Hydrogen peroxide
Light
Oxygen reduction reactions
passivation
Passivity
Photocatalysis
Photocatalysts
Semiconductors
single electron ORR
Single electrons
Sintering
SnO2-TiO2
Spin resonance
Synthesis
Tin dioxide
Titanium dioxide
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Summary:Photocatalysis provides an attractive strategy for synthesizing H2O2 at ambient condition. However, the photocatalytic synthesis of H2O2 is still limited due to the inefficiency of photocatalysts and decomposition of H2O2 during formation. Here, we report SnO2-TiO2 heterojunction photocatalysts for synthesizing H2O2 directly in aqueous solution. The SnO2 passivation suppresses the complexation and decomposition of H2O2 on TiO2. In addition, loading of Au cocatalyst on SnO2-TiO2 heterojunction further improves the production of H2O2. The in situ electron spin resonance study revealed that the formation of H2O2 is a stepwise single electron oxygen reduction reaction (ORR) for Au and SnO2 modified TiO2 photocatalysts. We demonstrate that it is feasible to enhance H2O2 formation and suppress H2O2 decomposition by surface passivation of the H2O2-decomposition-sensitive photocatalysts.
ISSN:2073-4344
2073-4344
DOI:10.3390/catal9070623