Beneficial effect of Nb doping on the photoelectrochemical properties of TiO₂ and TiO₂-polyheptazine hybrids

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• 作者：Bastian Mei ; Harriet Byford ; Michal Bledowski ; Lidong Wang ; Jennifer Strunk ; Martin Muhler ; Radim Beranek
• 关键词：Water splitting ; Water photooxidation ; Hybrid materials ; Visible light ; Titanium dioxide ; Doping
• 刊名：Solar Energy Materials and Solar Cells
• 出版年：2013
• 出版时间：October, 2013
• 年：2013
• 卷：117
• 期：Complete
• 页码：48-53
• 全文大小：1841 K

文摘

Nb-doped TiO₂ in pure anatase form prepared by spray drying exhibits enhanced photoelectrochemical performance both in its bare form (under UV irradiation) and when used as an electron collector in TiO₂-polyheptazine hybrid photoanodes for water photooxidation under visible (¦Ë>420 nm) light. The optimum Nb-doping concentration was 0.1 at % , and the enhancement of photocurrents was found to be chiefly due to enhanced mobility of electrons in Nb-doped TiO₂. Accordingly, the beneficial effect of Nb doping on photocurrent generation in hybrid photoanodes was pronounced particularly at longer irradiation wavelengths and lower bias potentials.