期刊
TOPICS IN CATALYSIS
卷 58, 期 12-13, 页码 776-782出版社
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s11244-015-0419-4
关键词
EPR; Photocatalysis; Titanium dioxide; Plasmon; Gold
资金
- Research Foundation-Flanders (FWO) [G.0687.13]
- FWO
- agency for Innovation by Science and Technology in Flanders (IWT)
X-band and W-band continuous-wave (CW) electron paramagnetic resonance (EPR) was used to study in situ light-induced (LI) mechanisms in commercial P90 titania (90 % anatase/10 % rutile) compared to plasmon-enhanced Au-P90 photocatalyst. These materials were excited using UV and 532 nm visible light to generate different excitation states and distinguish pure charge separation from plasmon-assisted resonance processes. Up to nine different photoinduced species of trapped electrons and holes were identified. LI CW EPR of P90 is presented for the first time, showing a UV excitation response similar to the well-known mixed-phase P25 titania. It is shown that incorporation of Au nanoparticles in Au-P90 and formation of a Schottky junction affects the charge separation state of the catalyst under UV light. Moreover, Au impregnation activated P90 through plasmon 'hot' electron injection under visible light excitation (plasmonic sensitization effect). In general, EPR proved to be crucial to determine the different photoexciation paths and reactions that regulate plasmonic photocatalysis.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据