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Z-scheme photocatalyst systems employing Rh- and Ir-doped metal oxide materials for water splitting under visible light irradiation

Abstract

Various Z-scheme systems for water splitting under visible light irradiation were successfully developed by employing Rh- and Ir-doped metal oxides powdered materials, BaTa2O6:Ir,La (EG: 1.9-2.0 eV), NaTaO3:Ir,La (EG: 2.1-2.3 eV), SrTiO3:Ir (EG: 1.6-1.8 eV), NaNbO3:Rh,Ba (EG: 2.5 eV) and TiO2:Rh,Sb (EG: 2.1 eV), with conventional SrTiO3:Rh of an H2-evolving photocatalyst or BiVO4 of an O2-evolving photocatalyst, and suitable electron mediators. The Z-scheme systems were classified into three groups depending on the combination of the H2- and O2-evolving photocatalysts and an electron mediator. Z-scheme systems combining BaTa2O6:Ir,La with BiVO4, and NaTaO3:Ir,La with BiVO4 were active when a [Co(bpy)3]3+/2+ redox couple was used. The combination of SrTiO3:Ir with SrTiO3:Rh gave an activity, when [Co(bpy)3]3+/2+ and Fe3+/2+ redox couples of ionic mediators were used. Z-scheme systems combining NaNbO3:Rh,Ba with SrTiO3:Rh and TiO2:Rh,Sb with SrTiO3:Rh showed activities by using of [Co(bpy)3]3+/2+ and Fe3+/2+ redox couples and also via interparticle electron transfer by just contact. When the impurity levels consisting of doped Rh3+ and Ir3+ toward the redox potentials of ionic mediators were suitable, the Z-scheme systems were able to be constructed. Photoelectrochemical properties of those photocatalyst materials were dominant for some Z-scheme systems working via interparticle electron transfer.

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Publication details

The article was received on 27 Nov 2018, accepted on 24 Jan 2019 and first published on 25 Jan 2019


Article type: Paper
DOI: 10.1039/C8FD00209F
Citation: Faraday Discuss., 2019, Accepted Manuscript

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    Z-scheme photocatalyst systems employing Rh- and Ir-doped metal oxide materials for water splitting under visible light irradiation

    A. Kudo, S. Yoshino, T. Tsuchiya, Y. Udagawa, Y. Takahashi, M. Yamaguchi, I. Ogasawara, H. Matsumoto and A. Iwase, Faraday Discuss., 2019, Accepted Manuscript , DOI: 10.1039/C8FD00209F

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