The mechanism of the anodic formation of the peroxodisulphate ion on platinum—I. establishment of the participating anion

Understanding Persulfate Production at Boron Doped Diamond Film Anodes

“…Smit and Hoogland extensively investigated the mechanisms associated with persulfate production on platinum electrodes [5][6][7][8]. These studies concluded that persulfate formation occurs via discharge of sulfate ions (SO 4 2À ) on sulfate covered portions of the Pt electrode.…”

Peroxodisulfate generation on boron-doped diamond microelectrodes array and detection by scanning electrochemical microscopy

“…The overall peroxodisulfate formation process corresponds to the reaction (1) [14,39]. The whole process is highly dependent on the mediated electrode surface generation of intermediate BDD SO 4 À ð Þ which seems possible at a potential for which the direct electrochemical formation of SO 4 À appears to be impossible.…”

“…The mechanism of the formation of peroxodisulfate from sulfate anions on platinum electrodes has been widely studied [14], as well as their reduction on different electrode material [15][16][17]. Two mechanisms have been proposed for the generation of peroxodisulfate.…”

“…The first model, proposed by Smit and Hoogland [14], considers a direct oxidation process at the electrode:…”

“…The sulfate adsorption followed by its oxidation is responsible of the decrease of the oxygen evolution reaction (OER) rate due to a decrease of the electrode active surface. Smit et al [14] have shown that the surface of the platinum electrode is progressively replaced by patches of adsorbed SO 4 2À on which S 2 O 8 2À formation proceeds instead of the oxygen evolution.…”