Photocatalytic production of H2O2 over rutile TiO2 supported with Pd nanoparticles

IF 6.3 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
Timur Fazliev, Danil Polskikh, Dmitry Selishchev
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Abstract

Hydrogen peroxide is a valuable chemical, which is commonly employed in environmental application for advanced oxidation processes and in energy application for fuel cells. Local production of H2O2 directly at sites of its consumption can eliminate risks and costs associated with transportation of concentrated H2O2 solutions. In this study, we investigated the ability of rutile or anatase TiO2 modified with Pd nanoparticles to produce hydrogen peroxide via photocatalytic oxygen reduction. Surface modification of TiO2 with Pd cocatalyst allowed H2O2 generation in both deionized water and water-methanol solution under UV-LED irradiation. Rutile TiO2 supported with Pd nanoparticles exhibited boosted photocatalytic activity in H2O2 formation compared to anatase-based photocatalyst·H2O2 was shown to predominantly form through the pathway of oxygen reduction, and observed difference in activity was attributed to different positions of energy bands in rutile and anatase phases. Methanol as an efficient electron donor substantially increased the amount of evolved H2O2. Rate constants of H2O2 generation over Pd-decorated rutile TiO2 were 1.7 μmol min−1 in deionized water and 7.4 μmol min−1 in water-methanol solution (10 vol%). This study reveals the potential of rutile for design of efficient heterostructured composites with other narrow-band semiconductors for photocatalytic generation of H2O2 under solar light.

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来源期刊
Applied Surface Science
Applied Surface Science 工程技术-材料科学:膜
CiteScore
12.50
自引率
7.50%
发文量
3393
审稿时长
67 days
期刊介绍: Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.
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