Citation: Roberts Charles A., Phivilay Somphonh P., Wachs Israel E.. Nature of surface oxygen intermediates on TiO₂ during photocatalytic splitting of water[J]. Chinese Chemical Letters, ;2018, 29(6): 769-772. doi: 10.1016/j.cclet.2017.09.029 shu

Nature of surface oxygen intermediates on TiO₂ during photocatalytic splitting of water

a.
Operando Molecular Spectroscopy & Catalysis Laboratory, Department of Chemical Engineering, Lehigh University, Bethlehem, PA 18015, United States
b.
Toyota Research Institute-North America, Ann Arbor, MI 48105, United States
c.
Department of Chemistry, University of Wisconsin-Madison, Madison, WI 53706, United States

Corresponding author: Wachs Israel E., iew0@lehigh.edu
Received Date: 28 June 2017
Revised Date: 3 August 2017
Accepted Date: 8 September 2017
Available Online: 8 June 2017

Figures(4)

Titanium dioxide (TiO₂) is the most widely studied solid photocatalyst, but when applied to photocatalytic splitting of water to H₂ and O₂, the evolution rate of H₂ is low and decreases with reaction time. The origin of the decreasing evolution rate for the photocatalytic splitting of water was investigated for the first time by directly monitoring the surface species on TiO₂ during water photocatalysis with in situ attenuated total reflectance (ATR)-Fourier transform infrared (FTIR) spectroscopy. The in situ ATR-FTIR spectroscopic analysis during UV illumination of TiO₂ immersed in water reveals that surface dioxygen and hydroxyl species are formed on TiO₂:charged Ti—OOH^-, peroxo Ti(O₂)^2-, and bridging Ti—(OH⁺) —Ti groups. The accumulation of these surface oxygenated species on the TiO₂ photocatalyst blocks the activation of H₂O on the surface titania sites and is responsible for the decreasing H₂ evolution rate and absence of O₂ evolution.
- Photocatalysis,
- ATR FTIR spectroscopy,
- TiO₂,
- Water splitting,
- In situ
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Nature of surface oxygen intermediates on TiO2 during photocatalytic splitting of water

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通讯作者: 陈斌, bchen63@163.com

Nature of surface oxygen intermediates on TiO₂ during photocatalytic splitting of water