Reduction Half Reactions Sample Clauses

Reduction Half Reactions. A popular photochemical system, focused on the reduction half reaction to generate hydrogen in the presence of a sacrificial donor, involves Ru(bpy)32+ (bpy stands for 2,2′-bipyridyl) (Xxxxxxxxxxxxxxx, 1982) as the absorber (see Figure 3 for the scheme); EDTA (ethylenediamine tetraacetic acid) is the sacrificial donor; MV2+ (methyl viologen) is the electron relay and colloidal Pt is the hydrogen-evolving redox catalyst (cat-red). Although this system has been studied extensively, the best overall quantum yield ( φH 2 ) is ~0.3, and there have been significant problems with side reactions, particularly with the degradation of the MV2+. Many other similar systems have been studied using a variety of different dyes (e.g., proflavin), relays (e.g., many other viologens, Co(II) and Rh(II) bipyridyl complexes) and sacrificial donors (e.g., triethanolamine).
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