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Two-step water splitting into H ₂ and O ₂ is demonstrated using KCa ₂ Nb ₃ O ₁₀ and its derivatives as O ₂ -evolving photocatalysts combined with a H ₂ -evolving photocatalyst in the presence of IO ₃ ⁻ /I ⁻ or Fe ³⁺ /Fe ²⁺ as an electron mediator.
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Suzuki et al. (2015) studied this question.
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