| Download | - View final version: Interfacial band alignment for photocatalytic charge separation in TiO2 nanotube arrays coated with CuPt nanoparticles (PDF, 2.8 MiB)
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| DOI | Resolve DOI: https://doi.org/10.1039/C5CP05679A |
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| Author | Search for: Farsinezhad, Samira; Search for: Sharma, Himani; Search for: Shankar, Karthik1 |
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| Affiliation | - National Research Council Canada. National Institute for Nanotechnology
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| Format | Text, Article |
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| Abstract | n-Type anatase-phase one-dimensional TiO2 nanostructure arrays coated with nanoparticles of Cu or CuPt have emerged as high performance photocatalysts for both photooxidation and photoreduction. The properties of the catalyst-promoter interface are recognized to be critical to this high performance but are largely unknown. Using X-ray and ultraviolet photoelectron spectroscopies (XPS/UPS), we probed the electronic properties of the CuPt–TiO2 interface in transparent TiO2 nanotube arrays (TTNTAs) coated with photodeposited CuPt nanoparticles (CuPt–TTNTA hybrids) as well as those coated with sputtered CuPt (Sput-CuPt–TTNTA hybrids). XPS and UPS spectra provided the evidence of a Schottky barrier with a band-bending of 0.49–0.67 eV at the CuPt–TiO2 interface in CuPt–TTNTA hybrids due to which photoexcited electrons are expected to be retained in the TiO2 while photoexcited holes will be collected by the CuPt nanoparticles. For Sput-CuPt–TTNTA hybrids, no such band-bending was observed. These results point to the importance of the metal nanoparticle preparation technique on interfacial band-alignments and challenge the conventional understanding of the promoting action of noble metal nanoparticles on TiO2 photocatalysts as sinks for photoexcited electrons. |
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| Publication date | 2015-10-14 |
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| Publisher | Royal Society of Chemistry |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NPARC number | 23001545 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 67d74f32-6368-4ef6-ac35-076b4781d47b |
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| Record created | 2017-03-03 |
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| Record modified | 2020-05-30 |
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