1. Charge carrier dynamics and photocatalytic activity of {111} and {100} faceted Ag3PO4particles
- Author
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Rochan Sinha, Anja Bieberle-Hütter, E. Zoethout, Mauritius C. M. van de Sanden, Dennis Friedrich, Matteo Parente, Georgios Zafeiropoulos, Plasma & Materials Processing, ICMS Business Operations, EIRES System Integration, and EIRES Systems for Sustainable Heat
- Subjects
Materials science ,010304 chemical physics ,Diffusion ,General Physics and Astronomy ,Quantum yield ,Crystal structure ,010402 general chemistry ,01 natural sciences ,0104 chemical sciences ,Solar fuels ,Chemical physics ,0103 physical sciences ,Photocatalysis ,Tetrahedron ,Charge carrier ,Physical and Theoretical Chemistry ,Physics::Chemical Physics ,Order of magnitude ,Visible spectrum - Abstract
Silver orthophosphate is a highly promising visible light photocatalyst with high quantum yield for solar driven water oxidation. Recently, the performance of this material has been further enhanced using facet-controlled synthesis. The tetrahedral particles with {111} exposed facets demonstrate higher photocatalytic performance than the cubic particles with {100} exposed facets. However, the reason behind this large difference in photocatalytic performance is still not understood. In this work, we study the free charge carrier dynamics, such as mobility, lifetime, and diffusion lengths, for the {111}-faceted tetrahedral and the {100}-faceted cubic particles using time-resolved microwave conductivity measurements. An order of magnitude higher charge carrier mobility and diffusion length are found for the tetrahedral particles as compared to the cubic particles. The differences in crystal structure, surface composition, and optical properties are investigated in order to understand how these properties impact the charge carrier dynamics and the photocatalytic performance of differently faceted particles.
- Published
- 2020
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