Surface Modification with Metal Hexacyanoferrates for Expanding the Choice of H₂‐Evolving Photocatalysts for both Fe³⁺/Fe²⁺ Redox‐Mediated and Interparticle Z‐Scheme Water Splitting Systems

The construction of Z-scheme water splitting systems is an effective approach toward harvesting a wide portion the solar light spectrum; however, success has often depended on property photocatalyst surfaces. This drawback typified by limited choice efficient H2-evolution photocatalysts (e.g., Rh-doped SrTiO3) for using Fe3+/Fe2+ redox couple. majority visible-light-responsive materials show low activity H2 production with Fe2+ electron donors despite having suitable band levels, probably due to absence surface site oxidizing Fe2+. interparticle also been limited. Herein, we report strategy overcoming these limitations: activation originally-inactive via modification metal hexacyanoferrate nanoparticles. Photocatalytic evolution over TaON in aqueous solution was drastically enhanced co-modification indium (InHCF) and Rh-Cr mixed oxide (RCO). InHCF promoted oxidation Fe3+ utilizing holes photogenerated FeIII/FeII cycles, enabling mediator coupled O2 under visible light. We disclose that nanoparticles function as solid achieving splitting. article protected copyright. All rights reserved.