Advanced Charge Utilization from NaTaO3 Photocatalysts by Multilayer Reduced Graphene Oxide

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• 作者：Tobias Meyer ; Jacqueline B. Priebe ; Rafael O. da Silva ; Tim Peppel ; Henrik Junge ; Matthias Beller ; Angelika Br眉ckner ; Sebastian Wohlrab
• 刊名：Chemistry of Materials
• 出版年：2014
• 出版时间：August 26, 2014
• 年：2014
• 卷：26
• 期：16
• 页码：4705-4711
• 全文大小：411K
• ISSN：1520-5002

文摘

NaTaO₃ compound prepared by (i) a solid state reaction (SSR) with crystallite sizes between 1鈥? 渭m and (ii) by an exotemplate method (EM) with crystallite sizes of about 25 nm was tested as photocatalyst in light-driven water splitting. NaTaO₃(EM) showed an 18 times higher photocatalytic hydrogen evolution rate than NaTaO₃(SSR). A further improvement by a factor of 28 was achieved by mixing the EM derived material with multilayer reduced graphene oxide (m-rGO). Moreover, by depositing 0.2 wt % Au on the surface of NaTaO₃(EM), the hydrogen production efficiency has been increased by a factor of 41. Surprisingly, the hydrogen production rate could not be significantly improved with NaTaO₃(SSR) under the same conditions. By using in situ EPR spectroscopy, the electronic interactions between semiconductor, cocatalyst, and m-rGO have been investigated in detail. Plausible electron separation and transfer mechanisms from NaTaO₃(SSR) or NaTaO₃(EM), respectively, to m-rGO are discussed and compared to the catalytic testing results.