Highly-Visible-Light Photocatalytic Performance Derived from a Lanthanide Self-Redox Cycle in Ln2O3/BiVO4 (Ln: Sm, Eu, Tb) Redox Heterojunction

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• 作者：Shaonan Gu ; Wenjun Li ; Yongzhong Bian ; Fangzhi Wang ; Hongda Li ; Xintong Liu
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：September 1, 2016
• 年：2016
• 卷：120
• 期：34
• 页码：19242-19251
• 全文大小：641K
• 年卷期：0
• ISSN：1932-7455

文摘

A new conception of redox heterojunction was proposed through coupled Ln₂O₃ (Ln: Sm, Eu, Tb) on the surface of BiVO₄ to illustrate the situation of multivalence elements appearance. Some subtle characteristics of photoreaction procedure behind the apparent photocatalytic activity were captured through a quenching experiment and electron paramagnetic resonance technology. Significantly, except for suppressing the recombination of electrons and holes, the redox cycle reaction of Sm³⁺/Sm²⁺ and Eu³⁺/Eu²⁺ in redox heterojunction dominated the production of the ^•O₂^– active radical during the photoreaction, and the redox cycle reaction of Tb⁴⁺/Tb³⁺ can only produce the ^•OH active radical. This evidence provided solid indication that the self-redox cycle reaction of multivalence elements with appropriate redox potential made a significant influence on photoreaction.