Indirect Z-Scheme BiOI/g-C3N4 Photocatalysts with Enhanced Photoreduction CO2 Activity under Visible Light Irradiation

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• 作者：Ji-Chao Wang ; Hong-Chang Yao ; Ze-Yu Fan ; Lin Zhang ; Jian-She Wang ; Shuang-Quan Zang ; Zhong-Jun Li
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：February 17, 2016
• 年：2016
• 卷：8
• 期：6
• 页码：3765-3775
• 全文大小：658K
• ISSN：1944-8252

文摘

Rational design and construction of Z-scheme photocatalysts has received much attention in the field of CO₂ reduction because of its great potential to solve the current energy and environmental crises. In this study, a series of Z-scheme BiOI/g-C₃N₄ photocatalysts are synthesized and their photocatalytic performance for CO₂ reduction to produce CO, H₂ and/or CH₄ is evaluated under visible light irradiation (λ > 400 nm). The results show that the as-synthesized composites exhibit more highly efficient photocatalytic activity than pure g-C₃N₄ and BiOI and that the product yields change remarkably depending on the reaction conditions such as irradiation light wavelength. Emphasis is placed on identifying how the charge transfers across the heterojunctions and an indirect Z-scheme charge transfer mechanism is verified by detecting the intermediate I₃^– ions. The reaction mechanism is further proposed based on the detection of the intermediate ^•OH and H₂O₂. This work may be useful for rationally designing of new types of Z-scheme photocatalyst and provide some illuminating insights into the Z-scheme transfer mechanism.