Revealing the Synergy of Mono/Bimetallic PdPt/TiO2 Heterostructure for Enhanced Photoresponse Performance

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Department of Chemistry and Soochow University-Western University Joint Centre for Synchrotron Radiation Research, University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B7, Canada
§ School of Material Science & Engineering, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, Changzhou, Jiangsu 213164, PR China
Soochow Univesity-Western University Joint Centre for Synchrotron Radiation Research, Insitute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123, PR China
Cite this: J. Phys. Chem. C 2017, 121, 44, 24861–24870
Publication Date (Web):October 15, 2017
https://doi.org/10.1021/acs.jpcc.7b08144
Copyright © 2017 American Chemical Society
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Abstract

This work reports a synergistic study of a noble metal (NM)/semiconductor hybrid structure featuring a mono/bimetallic PdPt/TiO2 heterostructure prepared by a facile anodization-hydrothermal process. The electronic interaction between TiO2 nanotubes (NTs) and mono/bimetallic PdPt nanoparticles (NPs), as well as the bimetallic PdPt interplay, has been thoroughly investigated by various X-ray techniques. Particularly, X-ray absorption near edge structure (XANES) at the Ti L3,2-edge and O K-edge was employed to understand the NM sensitization effect on the local structure of the TiO2 host. Meantime, d-charge redistribution within Pd and Pt upon alloying and loading on TiO2 NTs was disclosed at the Pt L3-edge and Pd L3-edge XANES, respectively. Consistent results were given from their corresponding X-ray photoemission spectroscopy (XPS) analysis. In addition, extended X-ray absorption fine structure (EXAFS) at the Pt L3-edge and Pd K-edge was also performed to unravel the atomic distribution and intermetallic interaction of Pd and Pt upon alloying. Finally, the synergy within the mono/bimetallic PdPt/TiO2 heterostructure was examined by size, compostion, and structure of the as-attached NM NPs assisted with photoresponse performance analysis.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.jpcc.7b08144.

  • Schematic illustration of noble metal (NM)/TiO2 heterojunction, SEM, and fitted first-shell EXAFS results at the Pt L3-edge and Pd K-edge, respectively (PDF)

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