Intrinsic AuPt-alloy particles decorated on TiO^sub 2^ nanotubes provide enhanced photocatalytic degradation

In this study we investigate the performance of noble metal co-catalysts on anodic TiO2 nanotubes for the photocatalytic degradation of a model pollutant. We create the noble metal decoration (nanoparticles of Au, Pt and mixed AuPt) intrinsically and extrinsically. Intrinsic decoration is achieved u...

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Published inElectrochimica acta Vol. 292; p. 865
Main Authors Sanabria-Arenas, Beatriz Eugenia, Mazare, Anca, Yoo, Jeongeun, Nguyen, Nhat Truong, Hejazi, Seyedsina, Bian, Haidong, Diamanti, Maria Vittoria, Pedeferri, Maria Pia, Schmuki, Patrik
Format Journal Article
LanguageEnglish
Published Oxford Elsevier BV 01.12.2018
Subjects
Catalytic activity
Chemical vapor deposition
Decoration
Dyes
Gold
Nanoparticles
Nanotubes
Noble metals
Photocatalysis
Photodegradation
Physical vapor deposition
Platinum
Synergistic effect
Titanium base alloys
Titanium dioxide
Tubes
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Summary:In this study we investigate the performance of noble metal co-catalysts on anodic TiO2 nanotubes for the photocatalytic degradation of a model pollutant. We create the noble metal decoration (nanoparticles of Au, Pt and mixed AuPt) intrinsically and extrinsically. Intrinsic decoration is achieved using a noble metal containing titanium alloy for anodic tube growth. Extrinsic decoration is carried out by physical vapor deposition (PVD) of the same noble elements on pure titania tubes. We find the AuPt intrinsic decoration to provide a significant enhancement for the photocatalytic decomposition of the model pollutant acid orange 7 (AO7) due to a synergistic effect in the formed AuPt alloy. The AuPt alloy provides a photocatalytic activity that is higher than comparable extrinsic decoration or single element (Pt or Au) intrinsic decoration.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2018.09.206