pH-Dependence in facet-selective photo-deposition of metals and metal oxides on semiconductor particles

被引：33

作者：

Guo, Yuxi ^{[1
,3
]}

Siretanu, Igor ^{[2
]}

Zhang, Yihe ^{[1
]}

Mei, Bastian ^{[3
]}

Li, Xiaowei ^{[1
]}

Mugele, Frieder ^{[2
]}

Huang, Hongwei ^{[1
]}

Mul, Guido ^{[3
]}

机构：

[1] China Univ Geosci, Sch Mat Sci & Technol, Beijing Key Lab Mat Utilizat Nonmetall Minerals &, Natl Lab Mineral Mat, Beijing 100083, Peoples R China

[2] Univ Twente, MESA Inst, Fac Sci & Technol, Phys Complex Fluids Grp, POB 217, NL-7500 AE Enschede, Netherlands

[3] Univ Twente, MESA Inst Nanotechnol, Photocatalyt Synth Grp, POB 217, NL-7500 AE Enschede, Netherlands

来源：

JOURNAL OF MATERIALS CHEMISTRY A | 2018年 / 6卷 / 17期

基金：

中国国家自然科学基金;

关键词：

ATOMIC-FORCE MICROSCOPY; BIOX X; PHOTOCATALYTIC ACTIVITY; SURFACE-DEFECTS; ENVIRONMENTAL APPLICATIONS; ORIENTATION DEPENDENCE; CHARGE SEPARATION; EXPOSED; 001; WATER; TIO2;

D O I：

10.1039/c8ta00781k

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Facet-engineering and the deposition of co-catalysts lead to significant improvement in efficiency of semiconductors in photocatalytic applications. Here, we demonstrate, using the specific example of bismuth-oxy-bromide (BiOBr) particles, that facet-selective, photo-induced reductive or oxidative deposition of co-catalysts onto plate-like semiconductor particles is strongly pH-dependent. High resolution atomic force microscopy and spectroscopy measurements demonstrate that the effect of pH is caused by a reversal of the surface charge of the [001] facets upon increasing pH from 3 to 9 (isoelectric point approximate to 5), while the side facets become increasingly negatively-charged. We discuss the effect of facet-surface-charge on particle distributions by band-bending, favoring either electron transfer and metal deposition, or hole transfer and metal-oxide deposition. This finding opens up new ways to design highly effective, photocatalytic composite architectures, containing spatially separated catalytic particles of multiple compositions.

引用

页码：7500 / 7508

页数：9

共 71 条

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