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Catalysts 2019, 9(4), 340; https://doi.org/10.3390/catal9040340

Integrated Au/TiO2 Nanostructured Photoanodes for Photoelectrochemical Organics Degradation

1
Dipartimento di Energia, Laboratorio di Catalisi e Processi Catalitici, Politecnico di Milano, via La Masa 34, I-20156 Milano, Italy
2
Università degli studi di Cagliari, Dipartimento di Ingegneria Meccanica, Chimica e dei Materiali, via Marengo 2, 09123 Cagliari, Italy
3
Dipartimento di Energia, Laboratorio Materiali Micro e Nanostrutturati, Politecnico di Milano, via Ponzio 34/3, I-20133 Milano, Italy
4
Department of Structure and Nano/-Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-straße 1, 40237 Düsseldorf, Germany
5
Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacký University Olomouc, Šlechtitelů 27, 783 71 Olomouc, Czech Republic
6
Center for Nanoscience and Technology – [email protected], via Giovanni Pascoli 70/3, 20133 Milano, Italy
*
Authors to whom correspondence should be addressed.
Received: 7 March 2019 / Revised: 27 March 2019 / Accepted: 2 April 2019 / Published: 5 April 2019
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Abstract

In this work, hierarchical Au/TiO2 nanostructures were studied as possible photoanodes for water splitting and bisphenol A (BPA) oxidation. TiO2 samples were synthetized by Pulsed Laser Deposition (PLD), while Au nanoparticles (NPs) were differently dispersed (i.e., NPs at the bottom or at the top of the TiO2, as well as integrated TiO2/Au-NPs assemblies). Voltammetric scans and electrochemical impedance spectroscopy analysis were used to correlate the morphology of samples with their electrochemical properties; the working mechanism was investigated in the dark and in the presence of a light radiation, under neutral pH conditions towards the possible oxidation of both bisphenol A (BPA) and water molecules. Different behavior of the samples was observed, which may be attributed mainly to the distributions of Au NPs and to their dimension as well. In particular, the presence of NPs at the bottom seems to be the crucial point for the working mechanism of the structure, thanks to scattering effects that likely allow to better exploit the radiation. View Full-Text
Keywords: photoelectrocatalysis; TiO2 nanostructures; Au nanoparticles; water splitting; bisphenol A oxidation photoelectrocatalysis; TiO2 nanostructures; Au nanoparticles; water splitting; bisphenol A oxidation
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MDPI and ACS Style

Matarrese, R.; Mascia, M.; Vacca, A.; Mais, L.; Usai, E.M.; Ghidelli, M.; Mascaretti, L.; Bricchi, B.R.; Russo, V.; Casari, C.S.; Li Bassi, A.; Nova, I.; Palmas, S. Integrated Au/TiO2 Nanostructured Photoanodes for Photoelectrochemical Organics Degradation. Catalysts 2019, 9, 340.

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