Enhanced Water-Splitting Performance of Perovskite SrTaO₂N Photoanode Film through Ameliorating Interparticle Charge Transport

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• 作者：Yujiao Zhong ; Zhaosheng Li ; Xin Zhao ; Tao Fang ; Huiting Huang ; Qinfeng Qian ; Xiaofeng Chang ; Peng Wang ; Shicheng Yan ; Zhentao Yu and Zhigang Zou
• 刊名：Advanced Functional Materials
• 出版年：2016
• 出版时间：October 18, 2016
• 年：2016
• 卷：26
• 期：39
• 页码：7156-7163
• 全文大小：2351K
• ISSN：1616-3028

文摘

Here SrTaO₂N has been found to exhibit photoelectrochemical water splitting, with a theoretical solar-to-hydrogen efficiency of 14.4%. Ameliorating the interparticle charge transport by H₂ annealing, the solar photocurrent of the SrTaO₂N(H) granular film at 1.23 V versus reversible hydrogen electrode (RHE) is increased by ≈250% in comparison with the SrTaO₂N film. Using an aberration corrected scanning transmission electron microscope and super-X energy dispersive spectroscopy, the atomic scale observation has proved a decrease of oxygen concentrations in the surface of SrTaO₂N(H) particle, which may allow its electrical conductivity to be increased from 0.77 × 10⁻⁶ to 2.65 × 10⁻⁶ S cm⁻¹ and therefore the charge separation efficiency has been greatly increased by ≈330%. After being modified by Co–Pi water oxidation catalyst, the SrTaO₂N(H) photoanode shows a solar photocurrent of 1.1 mA cm⁻² and an incident photo-to-current efficiency value of ≈20% at 400–460 nm and 1.23 V versus RHE, which suggests that it is a new promising photoanode material for solar water splitting.