Figure 14.

(a) Chemical structure and synthesis route of the OER2. (b) Photocurrent of three photoanodes (TiO₂+PS, TiO₂+PS+OER2, and TiO₂+OER2) with a 0.2 V vs NHE external bias in pH 6.8 phosphate buffer solution upon visible light irradiation (λ > 400 nm, 300 mW cm^–2). Adapted with permission from ref (184). Copyright 2015 Wiley-VCH. (c) Chemical structures of OER3, RuP, and RuPdvb²⁺. (d) Schematic diagram of the surface structure following reductive electropolymerization of OER3 on TiO₂-RuPdvb²⁺. (e) Photocurrents of nTiO₂-RuPdvb²⁺ (dashed) and nTiO₂-RuPdvb²⁺-polyOER3 (solid) at a bias of 0.2 V versus SCE. Adapted with permission from ref (186). Copyright 2015 Wiley-VCH.