Citation: Wang Mei, Liu Yuanxu, Li Dan, Tang Junwang, Huang Weixin. Isoelectric point-controlled preferential photodeposition of platinum on Cu₂O-TiO₂ composite surfaces[J]. Chinese Chemical Letters, ;2019, 30(5): 985-988. doi: 10.1016/j.cclet.2019.01.017 shu

Isoelectric point-controlled preferential photodeposition of platinum on Cu₂O-TiO₂ composite surfaces

Wang Mei ^a ,
Liu Yuanxu ^b ,
Li Dan ^a ,
Tang Junwang ^c ,
Huang Weixin ^a,*,

a.
Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, CAS Key Laboratory of Materials for Energy Conversion and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
b.
School of Pharmacy, Anhui University of Chinese Medicine, Anhui Academy of Chinese Medicine, Hefei 30012, China
c.
Department of Chemical Engineering, University College London, Torrington Place, London WC1E 7JE, UK

E-mail address:

Received Date: 30 November 2018
Revised Date: 15 January 2019
Accepted Date: 21 January 2019
Available Online: 21 May 2019

Figures(5)

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 PtCl₆^2- 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.
- Photocatalysts,
- Photocatalytic water reduction,
- Selective adsorption,
- Oxide composite,
- Co-catalyst
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沈阳化工大学材料科学与工程学院沈阳 110142

Isoelectric point-controlled preferential photodeposition of platinum on Cu2O-TiO2 composite surfaces

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通讯作者: 陈斌, bchen63@163.com

Isoelectric point-controlled preferential photodeposition of platinum on Cu₂O-TiO₂ composite surfaces