Wang, M;
Liu, Y;
Li, D;
Tang, J;
Huang, W;
(2019)
Isoelectric point-controlled preferential photodeposition of platinum on Cu2O-TiO2 composite surfaces.
Chinese Chemical Letters
, 30
(5)
pp. 985-988.
10.1016/j.cclet.2019.01.017.
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Abstract
Photodeposition emerges as a convenient method to synthesize metal particles on semiconductor supports. In this work, we study the photodeposition of Pt on Cu2O-TiO2 composite surfaces employing H2PtCl6 aqueous solution as the precursor and reveal a key role of isoelectric point of oxide surfaces on the Pt photodeposition process. Under the photodeposition conditions, Pt metal particles are facilely photodeposited on TiO2 support; on Cu2O-TiO2 composite supports, the Cu2O surface is positively charged and enriched with photo-excited holes while the TiO2 surface is negatively charged and enriched with photo-excited electrons. This lead to the preferential adsorption of PtCl62− anion precursor on the Cu2O surface of Cu2O-TiO2 composite and the dominant formation of Pt oxide particles on Cu2O surface but few Pt metal particles on TiO2 surface. Consequently, the activity of resulting Pt/Cu2O-TiO2 composite photocatalysts in photocatalytic water reduction decreases as the Cu2O content increases. These results deepen the understanding of photodeposition processes on oxide composite surfaces.
| Type: | Article |
|---|---|
| Title: | Isoelectric point-controlled preferential photodeposition of platinum on Cu2O-TiO2 composite surfaces |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.cclet.2019.01.017 |
| Publisher version: | http://dx.doi.org/10.1016/j.cclet.2019.01.017 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Photocatalysts, Photocatalytic water reduction, Selective adsorption, Oxide composite, Co-catalyst, HYDROGEN-PRODUCTION, WATER, TIO2, COCATALYSTS, CATALYSTS, PHOTOCATALYSIS, DEGRADATION, REDUCTION |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10112562 |
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