Solar Water Splitting under Neutral Conditions Using Z-Scheme Systems with Mo-Doped BiVO4 as an O2-Evolving Photocatalyst

Akihide Iwase, Yuhei Udagawa, Shunya Yoshino, Yun Hau Ng, Rose Amal, Akihiko Kudo

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Abstract

The photocatalytic water-splitting system ideally consists of just photocatalyst powder and water without any additives. Herein, improvement of water-splitting activity under neutral conditions is achieved by applying Mo-doping and cocatalyst-loading to BiVO4 of an O2-evolving photocatalyst in a Z-scheme system with Ru-loaded SrTiO3 doped with Rh as a H2-evolving photocatalyst and a reduced graphene oxide as an electron mediator. The strategies are based on the idea that the Z-schematic electron migration process in the powdered Z-scheme system with reduced graphene oxide is similar to that in the photoelectrochemical system. Although the reaction condition becomes out of the ideal states, adding Ca(NO3)2 and CaCl2 into the reactant solution further improves the water-splitting activity due to the formation of aggregated photocatalyst particles to boost the electron transfer from Mo-doped BiVO4 to Ru-loaded SrTiO3 doped with Rh through the reduced graphene oxide.

Original languageEnglish
Article number1900358
JournalEnergy Technology
Volume7
Issue number8
DOIs
Publication statusPublished - 1 Jan 2019

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Keywords

  • graphene
  • photocatalysis
  • water splitting

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