Effect of Precursor Selection on the Photocatalytic Performance of Indium Oxide Nanomaterials for Gas-Phase CO2 Reduction

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• 作者：Laura B. Hoch ; Le He ; Qiao Qiao ; Kristine Liao ; Laura M. Reyes ; Yimei Zhu ; Geoffrey A. Ozin
• 刊名：Chemistry of Materials
• 出版年：2016
• 出版时间：June 28, 2016
• 年：2016
• 卷：28
• 期：12
• 页码：4160-4168
• 全文大小：459K
• 年卷期：0
• ISSN：1520-5002

文摘

Nonstoichiometric indium oxide nanoparticles, In₂O_3–x(OH)_y, have been shown to function as active photocatalysts for gas-phase CO₂ reduction under simulated solar irradiation. Herein we demonstrate that the choice of starting material has a strong effect on the photocatalytic activity of indium oxide nanoparticles. We examine three indium oxide materials prepared via the thermal decomposition of either indium(III) hydroxide or indium(III) nitrate and correlate their stability and photocatalytic activity to the number and type of defect present in the material. Further, we use ¹³CO₂ isotope-tracing experiments to clearly identify the origins of the observed carbon-containing products. Significantly, we find that the oxidizing nature of the precursor anion has a substantial impact on the defect formation within the sample. This study demonstrates the importance of surface defects in designing an active heterogeneous photocatalyst and provides valuable insight into key parameters for the precursor design, selection, and performance optimization of materials for gas-phase CO₂ reduction.