Tailoring of the photocatalytic activity of CeO2 nanoparticles by the presence of plasmonic Ag nanoparticles
Zhao, Shuang (Universität Hamburg. Fachbereich Physik)
Riedel, Marc (Technical University of Applied Sciences Wildau. Institute of Life Sciences and Biomedical Technologies)
Patarroyo, Javier (Institut Català de Nanociència i Nanotecnologia)
Bastús, Neus G. (Institut Català de Nanociència i Nanotecnologia)
Puntes, Víctor (Institut Català de Nanociència i Nanotecnologia)
Yue, Zhao (Nankai University. Department of Microelectronics)
Lisdat, Fred (Technical University of Applied Sciences Wildau. Institute of Life Sciences and Biomedical Technologies)
Parak, Wolfgang J. (Universität Hamburg. Fachbereich Physik)

Fecha:	2022
Resumen:	The present study investigates basic features of a photoelectrochemical system based on CeO nanoparticles fixed on gold electrodes. Since photocurrent generation is limited to the absorption range of the CeO in the UV range, the combination with metal nanoparticles has been studied. It can be shown that the combination of silver nanoparticles with the CeO 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 CeO@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 CeO 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 CeO@Ag nanoparticles submicromolar hydrogen peroxide concentrations can be detected.
Ayudas:	Agencia Estatal de Investigación RTI2018-099965-B-I00 Ministerio de Economía y Competitividad SEV-2017-0706
Nota:	Altres ajuts: ICN2 is funded by the CERCA Programme/Generalitat de Catalunya.
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Electron transfer ; Excitation range ; Gold electrodes ; Hybrid nanoparticle ; Photocatalytic activities ; Photocurrent generations ; Photoelectrochemical system ; Plasmonics ; Visible-light wavelengths ; Wavelength ranges
Publicado en:	Nanoscale, Vol. 14, issue 33 (Sep. 2022) , p. 12048-12059, ISSN 2040-3372

DOI: 10.1039/d2nr01318e

12 p, 2.0 MB

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