Remarkable Visible-Light Photocatalytic Activity Enhancement over Au/p-type TiO Promoted by Efficient Interfacial Charge Transfer.

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ID: 54231
2019
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Abstract
Metal-induced photocatalysis has emerged as a promising approach for exploiting visible-light-responsive composite materials for solar energy conversion, which is generally hindered by low photocatalytic efficiency. Herein, for the first time, an Au/p-TiO (p-type TiO) strategy with the hole transfer mechanism is developed, remarkably promoting visible-light photocatalytic performance. An efficient acetone evolution rate (138 μmol·g·h) in the photocatalytic isopropyl alcohol (IPA) degradation under λ = 500 nm light (light intensity, 5.5 mW/cm) was achieved over Au/p-TiO, which is approximately 5 times as high as that over Au/n-TiO under the same conditions. Photoluminescence and electrochemical impedance spectroscopy measurements indicate enhanced charge carrier separation and transfer for Au/p-TiO. In an elaborate study, apparent quantum efficiency and transmission electron microscopy characterization on selective PbO deposition over p-TiO revealed that visible-light-excited holes other than electrons generated in the Au interband transition transferred to p-TiO, which is opposite to the general route in Au/n-TiO (n-type TiO). Energetic holes generated in the d band of Au led to a fluent transfer across the Schottky barrier, which is further confirmed by the IPA photodegradation mechanism study with different scavengers over Au/p-TiO. This discovery opens up new opportunities in designing and developing efficient metal semiconductor composite materials with visible-light response.
Reference Key
fu2019remarkableacs Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Fu, Ao;Chen, Xin;Tong, Lihang;Wang, Defa;Liu, Lequan;Ye, Jinhua;
Journal ACS applied materials & interfaces
Year 2019
DOI
10.1021/acsami.9b07110
URL
Keywords
au/p-tio ipa degradation hole transfer interband transition metal-induced photocatalysis p-type tio

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