Advanced charge utilization from NaTaO3 photocatalysts by multilayer reduced graphene oxide

Tobias Meyer, Jacqueline B. Priebe, Rafael O. Da Silva, Tim Peppel, Henrik Junge, Matthias Beller, Angelika Brückner, Sebastian Wohlrab

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

NaTaO3 compound prepared by (i) a solid state reaction (SSR) with crystallite sizes between 1-5 μm 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 NaTaO 3(SSR) or NaTaO3(EM), respectively, to m-rGO are discussed and compared to the catalytic testing results.

Original languageEnglish
Pages (from-to)4705-4711
Number of pages7
JournalChemistry of Materials
Volume26
Issue number16
DOIs
StatePublished - 26 Aug 2014
Externally publishedYes

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