Mediation at High Potentials for the Reduction of Oxygen to Water by Cobalt Porphyrin–Quinone Systems in Porous Aerogel Carbon Electrodes
作者： L. Elbaz , E. Korin , L. Soifer , A. Bettelheim
DOI: 10.1149/1.3247582
关键词: Inorganic chemistry 、 Adsorption 、 Hydroquinone 、 Catechol 、 Quinone 、 Porphyrin 、 Electrochemistry 、 Oxygen 、 Cobalt 、 Chemistry
摘要: Reduced p-, m-, and o-benzoquinones: hydroquinone (HQ), resorcinol (Res), catechol (Cat), undergo irreversible monolayer adsorption in aerogel carbon (AEC) electrodes with rates of 1.7 × 10 ―4 , 7.1 ―5 1.4 s ―1 for HQ, Res, Cat, respectively. The adsorbed species showed electrochemical quasi-reversible behavior 1 M H 2 SO 4 half-wave potentials (E 1/2 ) +0.45, +0.31, +0.58 V vs Ag/AgCl/KCl (saturated) AEC/HQ, AEC/Res, AEC/Cat, Upon Co(III) tetra(p-sulfonatophenyl)porphyrin these electrodes, a single reduction wave was observed its E (∼+0.45 V) independent the nature reduced quinone. This attributed to metalloporphyrin/ quinone complex, which formed stabilized at electrode surface. species, after being reduced, reacted oxygen rate 1.8 5 . Mediation by systems occurred relatively high potential (∼+0.5 almost completely via four-electron-transfer process.
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