Overcoming Pd–TiO2 deactivation during H2 production from photoreforming using Cu@Pd nanoparticles supported on TiO2

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Platero, F.
López-Martín, A.
Caballero, A.
Rojas, T. C.
Nolan, Michael
Colón, G.
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Different Cu@Pd-TiO2 systems have been prepared by a two-step synthesis to obtain a bimetallic co-catalyst for the H2 photoreforming reaction. We find that the tailored deposition of Pd covering the Cu nanoclusters by a galvanic replacement process results in the formation of a core@shell structure. The photocatalytic H2 production after 18 h is 350 mmol/g on the Cu@Pd1.0-TiO2 bimetallic system, which is higher than that on the monometallic ones with a H2 production of 250 mmol/g on Pd-supported TiO2. Surface characterization by high-angle annular dark-field scanning transmission electron microscopy, H2-temperature-programed reduction, CO-FTIR spectroscopy, and XPS gives clear evidence of the formation of a core@shell structure. With a Pd loading of 0.2-0.3 at. %, we propose a full coverage of the Cu nanoparticles with Pd. Long-time photoreforming runs show the enhanced performance of supported Cu@Pd with respect to bare palladium leading to a more stable catalyst and ultimately higher H2 production.
Copper , Core-shell , DFT , H photoreforming 2 , Palladium , TiO 2
Platero, F., López-Martín, A., Caballero, A., Rojas, T. C., Nolan, M. and Colón, G. (2021) 'Overcoming Pd–TiO2 deactivation during H2 production from photoreforming using Cu@Pd nanoparticles supported on TiO2', ACS Applied Nano Materials, 4(3), pp. 3204-3219. doi: 10.1021/acsanm.1c00345
© 2021, American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Nano Materials, after technical editing by the publisher. To access the final edited and published work see: https://doi.org/10.1021/acsanm.1c00345