Abstract
Heterojunction Pt/GaP-TiO2-SiO2:Rh (PGTSR) photocatalyst with the uniform spherical morphology (20 nm) possessed the high Ti3+ defects and oxygen vacancy (VO) sites in TiO2-SiO2:Rh composite which intimately contacted with GaP to form a Z-scheme photocatalyst. The PGTSR exhibited high photoactivity for pure water and artificial seawater splitting without sacrificial agents in single reactor under 4 -h simulated sunlight irradiation. The hydrogen/oxygen evolution rates (HER/OER) reached 80.1/41.2 μmol.g−1 and 94.0/45.1 μmol.g−1 in pure and artificial seawater splitting, respectively. The separated H2 evolution from O2 through the photocatalytic artificial seawater splitting was also carried out in a twin photoreactor, which was divided by a Neosepta membrane with IO3-/I- shuttle mediator and used commercial WO3 as O2-photocatalyst, was achieved with HER/OER of 41.5/26.1 μmol.g−1 after 4 -h simulated sunlight irradiation. This work demonstrated a new construct of Z-scheme photocatalyst as well as the improvement of artificial photosynthesis system for overall photocatalytic seawater splitting.
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