Bifunctional Modification of Graphitic Carbon Nitride with MgFe2O4 for Enhanced Photocatalytic Hydrogen Generation

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• 作者：Jie Chen ; Daming Zhao ; Zhidan Diao ; Miao Wang ; Liejin Guo ; Shaohua Shen
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：August 26, 2015
• 年：2015
• 卷：7
• 期：33
• 页码：18843-18848
• 全文大小：304K
• ISSN：1944-8252

文摘

To gain high photocatalytic activity for hydrogen evolution, both charge separation efficiency and surface reaction kinetics must be improved, and together would be even better. In this study, the visible light photocatalytic hydrogen production activity of graphitic carbon nitride (g-C₃N₄) was greatly enhanced with MgFe₂O₄ modification. It was demonstrated that MgFe₂O₄ could not only extract photoinduced holes from g-C₃N₄, leading to efficient charge carrier separation at the g-C₃N₄/MgFe₂O₄ interface, but also act as an oxidative catalyst accelerating the oxidation reaction kinetics at g-C₃N₄ surface. This dual function of MgFe₂O₄ thus contributed to the great improvement (up to three-fold) in photocatalytic activity for hydrogen generation over g-C₃N₄/MgFe₂O₄ as compared to pristine g-C₃N₄, after loading Pt by photoreduction method. It was revealed that in the Pt/g-C₃N₄/MgFe₂O₄ system, the photoinduced electrons and holes were entrapped by Pt and MgFe₂O₄, respectively, giving rise to the promoted charge separation; moreover, as evidenced by electrochemical analysis, the electrocatalysis effect of MgFe₂O₄ benefited the oxidation reaction at g-C₃N₄ surface.