Catalytic effects of [Ag(H2O)(H3PW11O39)]3− on a TiO2 anode for water oxidation

[H3AgI(H2O)PW11O39]3− was immobilized on a TiO2/ITO electrode, and showed enhanced electrocatalytic activity for water oxidation to O2. Our results indicate that the [H3PW11O39]4− ligand plays an important role in transferring electrons and protons in water oxidation process.