Abstract
Conditions for the efficient photo‐oxidation of iodide for both and are demonstrated by theoretical collection properties in rotating ring‐disk electrode configurations. A specific surface interaction promoting hole transfer kinetics is evidenced by open‐circuit potential shifts of illuminated disks with iodide concentration and nearly quantitative disk iodine production at low iodide concentrations. For , however, high concentrations of and control of hydrogen ion levels are both needed to maintain a thin, charge conducting semiconductor‐oxide film and adequate kinetics for solution iodide oxidation. Acidified concentrated iodide is the first electrolyte with an photoanode to handle solar current densities.
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