期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 44, 期 41, 页码 22962-22971出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2019.06.200
关键词
TiO2 nanotubes; Photocatalytic H-2 generation; Dewetting; PtPd alloy; Dealloying
资金
- ERC
- DFG
- Erlangen DFG cluster of excellence EAM [EXC 315]
- DFG funCOS
- Operational Programme Research, Development and Education-European Regional Development Fund of the Ministry of Education, Youth and Sports of the Czech Republic [CZ.02.1.01/0.0/0.0/15_003/0000416]
In the present work we introduce a simple approach to produce porous PtPdAg alloy nanoparticles on TiO2 nanotubes by a simple combined sputtering-dewetting-dealloying process. In a first step, three individual metals (Pt, Pd and Ag) were sequentially sputter-deposited on spaced TiO2 nanotubes, followed by a thermal dewetting treatment in Ar to convert these metal layers into ternary PtPdAg alloyed particles. Dealloying was carried out by a selective chemical dissolution of Ag in piranha solution that finally generated porous alloyed nanoparticles located on the TiO2 nanotube walls. The porous PtPdAg-decorated TiO2 nanotubes show enhanced photocatalytic H-2 generation in comparison with porous Pt (67% increase) or any monometallic decoration (>120% increase). The photocatalytic enhancement is not only due to the increased number of active sites (larger surface area) of the porous particles but also due to the synergistic effects of the different alloying elements. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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