Engineering the outermost layers of TiO₂ nanoparticles using in situ Mg doping in a flame aerosol reactor

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• 作者：Yanjie Hu ; Hao Jiang ; Yunfeng Li ; Binqi Wang ; Ling Zhang ; Chunzhong Li ; Yang Wang ; Theodore Cohen ; Yi Jiang and Pratim Biswas
• 刊名：AIChE Journal
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：63
• 期：3
• 页码：870-880
• 全文大小：911K
• ISSN：1547-5905

文摘

Titanium dioxide nanoparticles with disordered outermost layer sturctures have significantly enhanced light absorption and photocatalytic properties and thus receiving enhanced attention in recent years. Engineering the outermost layers using in situ magnesium doping to tailor the band-edge of TiO₂ nanoparticles was achieved via a flame aerosol reactor. The distribution of doped elements in nanoparticles could be controlled in a high temperature flame process, and which could be predicted by the comparison of different characteristic time scales, such as reaction time, coagulation time, and sintering time is proposed. In situ magnesium doping on the outermost layers effectively tailored the conduction band and electron structure of the TiO₂ nanoparticles, and simultaneously improved the maximum photocurrent as well as the maximum photovoltage in dye-sensitized solar cells. These improvements were largely attributed to red-shifted light absorption, and rapid photoelectron injection into the conduction band.