期刊
APPLIED CATALYSIS A-GENERAL
卷 518, 期 -, 页码 213-220出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2015.10.023
关键词
Photocatalysis; Co-catalyst; Core-shell structure; Hydrogen evolution; Au; Ag; Reaction mechanisms
资金
- EPSRC [EP/K014854/1, EP/K014714/1, EP/I019693/1]
- Engineering and Physical Sciences Research Council [EP/K014854/1, EP/K014714/1, EP/I019693/1] Funding Source: researchfish
- EPSRC [EP/K014854/1, EP/I019693/1, EP/K014714/1] Funding Source: UKRI
Metal co-catalysts are essential for enhancing photocatalytic performance, especially in reduction reactions using semiconductor photocatalyst materials as a consequence of the reduced recombination kinetics of charge carriers by spatial charge separation. Generally Au, Pd, Pt, and their alloys are more promising candidates than Ag for photocatalytic H-2 evolution experiments, although Ag can trap more electrons having more negative reduction potential than that of Au, Pd, and Pt. Here we have synthesized and examined well-defined Au, Ag, and core-shell structured Au-Ag nanoparticles as co-catalysts for TiO2 in photocatalytic H-2 evolution. By varying the dissolved oxygen in the reaction suspension, we found that selective photocatalytic reduction can be achieved by fine tuning the co-catalyst materials. Whilst Au NPs are superior for proton reduction, Ag NPs exhibits excellent performance for oxygen reduction. All core-shell structured Au-Ag NPs show non-selectivity in photocatalytic reduction of proton and oxygen. (C) 2015 Elsevier B.V. All rights reserved.
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