Figure 13.

(a) Chemical structure of OER1. (b) Light-driven PEC water splitting device, consisting of TiO₂-RuP/Nafion-OER1, a Pt cathode, and an aqueous electrolyte. (c) Transient short-circuit current responses to on–off cycles of illumination. The illumination is provided by a light-emitting diode operated in a 0.1 M Na₂SO₄ aqueous solution in PEC devices without applying any bias. Nafion pH 7.0 represents the related Nafion film prepared using a pH 7.0 Nafion solution, respectively. (d) Oxygen evolution in PEC devices without applying any bias, operated in a pH 7.0 phosphate buffer solution, detected by a Clark electrode, and illuminated by a 500 W xenon lamp through a 400 nm cut-off filter. Complex 1⁺ indicates the OER1. Adapted with permission from ref (180). Copyright 2010 Royal Society of Chemistry.