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The molecular water oxidation catalyst 1 was electrochemically polymerized on a dye-sensitized TiO 2 electrode and an Fe 2 O 3 nanorod electrode. High photocurrent densities of ca. 1.4 mA cm –2 for poly- 1 + RuP @TiO 2 and ca. 0.4 mA cm –2 for poly- 1 @Fe 2 O 3 were achieved under pH-neutral conditions. A kinetic isotope effect (KIE) study on poly- 1 + RuP @TiO 2 shows that poly- 1 catalyzes water oxidation on the surface of TiO 2 via a radical coupling mechanism.
Li et al. (2015) studied this question.