Is surface doping or bulk doping more beneficial to the photocatalytic activity of TiO2

Su-Min Chang*

*此作品的通信作者

研究成果: Conference contribution同行評審

1 引文 斯高帕斯(Scopus)

摘要

Doping has been demonstrated to inhibit charge recombination and improve photocatalytic activity of photocatalysts. Conventional doping incorporates hetero-ions into the bulk lattice. In the presence of the defects, few charge carriers are trapped to suppress band-to-band recombination. Because most of trapped carriers annihilate with the counterparts, a low doping level is required, and the optimal doping concentration decreases with increasing particle size. Surface doping, on the other hand, only introduces dopants into the surface lattice. Surface-doped ions create an internal electric field to drive charge carriers to quickly drift to the surface. In addition, they trap the carriers and mediate charge transfer to the chemisorbed species. Compared to bulk doping, surface doping not only inhibits both bulk and surface recombination but also improves interfacial charge transfer, thus is more effective to improve photocatalytic activity.

原文English
主出版物標題ACS Symposium Series
發行者American Chemical Society
頁面121-131
頁數11
ISBN(電子)9780841230149
DOIs
出版狀態Published - 1 一月 2014

出版系列

名字ACS Symposium Series
1184
ISSN(列印)0097-6156
ISSN(電子)1947-5918

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