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Tailoring of the photocatalytic activity of CeO₂ nanoparticles by the presence of plasmonic Ag nanoparticles

  • The present study investigates basic features of a photoelectrochemical system based on CeO2 nanoparticles fixed on gold electrodes. Since photocurrent generation is limited to the absorption range of the CeO2 in the UV range, the combination with metal nanoparticles has been studied. It can be shown that the combination of silver nanoparticles with the CeO2 can shift the excitation range into the visible light wavelength range. Here a close contact between both components has been found to be essential and thus, hybrid CeO2@Ag nanoparticles have been prepared and analyzed. We have collected arguments that electron transfer occurs between both compositional elements of the hybrid nanoparticles.The photocurrent generation can be rationalized on the basis of an energy diagram underlying the necessity of surface plasmon excitation in the metal nanoparticles, which is also supported by wavelength-dependent photocurrent measurements. However, electrochemical reactions seem to occur at the CeO2 surface and consequently, the catalytic properties of this material can be exploited as exemplified with the photoelectrochemical reduction of hydrogen peroxide. It can be further demonstrated that the layer-by layer technique can be exploited to create a multilayer system on top of a gold electrode which allows the adjustment of the sensitivity of the photoelectrochemical system. Thus, with a 5-layer electrode with hybrid CeO2@Ag nanoparticles submicromolar hydrogen peroxide concentrations can be detected.

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Metadaten
Author:Shuang Zhao, Marc Riedel, Javier Patarroyo, Neus G. Bastús, Victor Puntes, Yue Zhao, Fred LisdatORCiDGND, Wolfgang J. Parak
URN:urn:nbn:de:kobv:526-opus4-16361
DOI (Version of Record):https://doi.org/10.1039/D2NR01318E
Parent Title (English):Nanoscale
Publisher:Royal Society of Chemistry (RSC)
Document Type:Article
Language:English
Year of Publication:2022
Publishing Institution:Technische Hochschule Wildau
Release Date:2022/08/29
Volume:14
First Page:12048
Last Page:12059
Source:Zhao, S., Riedel, M., Patarroyo, J., Bastús, N. G., Puntes, V., Yue, Z., … Parak, W. J. (2022). Tailoring of the photocatalytic activity of CeO₂ nanoparticles by the presence of plasmonic Ag nanoparticles. Nanoscale, 14, 12048–12059. doi:10.1039/D2NR01318E
Faculties an central facilities:Fachbereich Ingenieur- und Naturwissenschaften
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 54 Chemie / 541 Physikalische Chemie
Licence (German):Creative Commons - CC BY 3.0 - Namensnennung 3.0 Unported
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