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A wide visible light driven complex perovskite Ba(Mg1/3Ta2/3)O3-xNy photocatalyst for water oxidation and reduction

Abstract

Development of potential photocatalysts that can harvest visible light and drive two half reactions of water splitting is of vital importance in solar energy utilization. Here we report a new deep nitrogen-doped complex perovskite metal oxide Ba(Mg1/3Ta2/3)O3-xNy (denoted as BMTON) that shows a wide visible light response with absorption edge of ca. 560 nm rather than a shoulder absorption. Various characterizations indicate that the greatly extended light absorption is mainly ascribed to the efficient nitrogen doping into the oxide precursor Ba(Mg1/3Ta2/3)O3 (denoted as BMTO) that can be simply understood as lattice Mg partly substituted BaTaOx. Meanwhile, theoretical results demonstrate that the weakened Ta-O bonds of oxide precursor by the substitution of Mg atoms with lower electronegativity to Ta atoms is responsible for the enhanced nitrogen permeation. After loading of cocatalysts Pt or CoOx, BMTON is active for H2 and O2 evolution under visible light irradiation in the presence of CH3OH and AgNO3 respectively. This work may open a new venue to prepare nitrogen-doped metal oxide with wide visible light utilization for potential solar energy conversion by choosing suitable precursor oxide of nitridation.

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Publication details

The article was received on 06 Jul 2017, accepted on 07 Aug 2017 and first published on 08 Aug 2017


Article type: Paper
DOI: 10.1039/C7TA05879A
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    A wide visible light driven complex perovskite Ba(Mg1/3Ta2/3)O3-xNy photocatalyst for water oxidation and reduction

    J. Y. Cui, T. Liu, Y. Qi, D. Zhao, M. Jia, G. Liu, F. Zhang and C. Li, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA05879A

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