Abstract
• Mapping out of solubility and transport scenario of O 2 in an organized micellar media through the study of electrochemical oxygen reduction reaction (ORR). • Simultaneous determination of saturation concentration ( C o 2 ) and diffusion coefficient ( D o 2 ) of O 2 in SDS micellar medium by studying ORR. • Identification of the ascending trend of C o 2 with increasing concentration of SDS and verification of the acceptability of excess C o 2 in SDS with computer simulation. • Recognizing the micro-domains of micelles studied with dynamic light scattering as the nest for residence of O 2 and as a high-density, slow-releasing warehouse of O 2 . The solubility and diffusibility of molecular O 2 are critically important in many chemical, biological, electrochemical, energy generation and storage systems. In this work, by the study of electrochemical O 2 reduction reaction (ORR), the solubility and transport scenario of O 2 in organized micellar media as monitored with dynamic light scattering measurement were mapped out. The ORR was investigated in aqueous H 2 SO 4 solution and micellar medium of sodium dodecyl sulfate (SDS) at glassy carbon and platinum electrodes using cyclic voltammetric and chronoamperometric techniques. The ORR studied in both media was found to be an irreversible, diffusion-controlled process. The diffusion coefficient ( D o 2 ) and the saturation concentration of O 2 ( C o 2 ) were determined by studying the ORR with chronoamperometry and steady-state voltammetry. The D o 2 was found to be lower in micellar system compared to the aqueous solution, whereas the C o 2 determined in 0.200 M micellar medium of SDS was about 15-fold higher than that of H 2 SO 4 solution. The characteristics of the ORR studied and the values of D o 2 and C o 2 determined in micellar media were verified by simulation software for cyclic voltammetry. Higher solubility of O 2 is revealed in the hydrophobic micro-domains of micelles that behave as a nest for the residence of O 2 and may serve as a high-density, slow-releasing warehouse of molecular O 2 . This study opens a noble route for designing molecular shuttles assisting O 2 to maintain its flow in a system containing O 2 permeable membranes.
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