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The Electrocatalytic Reduction of Molecular Oxygen with Clay Modified Electrodes  

Oh Sung-Hun (Department of Geology, Pusan National University)
Hwang Jin-Yeon (Department of Geology, Pusan National University)
Shim Yoon-Bo (Department of Chemistry, Pusan National University)
Lee Hyomin (Department of Geology, Pusan National University)
Yoon Jihae (Department of Geology, Pusan National University)
Publication Information
Journal of the Mineralogical Society of Korea / v.18, no.1, 2005 , pp. 1-9 More about this Journal
Abstract
The electrocatalytic reduction of O₂ was investigated with methyl viologen and methylene blue incorporated clay-modified electrodes. Clay suspensions were prepared with Na-montmorillonite, Ca-montmorillonite, and kaolinite. The methyl viologen-clay modified electrodes were made by coating clay suspensions adsorbing methyl viologen on a glassy carbon electrode. Cyclic voltammetry were performed in aqueous media to investigate the electrocatalytic property of the modified electrode in reducing O₂. A Na-montmorillonite modified electrode showed the greatest adsorption capacity for methyl viologen. The modified electrode made of Na-montmorillonite suspension of 0.87 g/10 mL and a 2.5 mM of methyl viologen solution showed the most effective electrocatalytic property, where the catalytic reduction potential was shifted by 242.6 mV toward the positive potential. The electrocatalytic ability was more significant in acidic (pH=3.7) and alkaline (pH=12.7) media than the neutral pH range (6.3∼8.3). The methyl viologen-Na-montmorillonite modified electrode had the good reproducibility and maintain the electrocatalytic property over 20 times reuse.
Keywords
clay-modified electrode; electrocatalytic property; clay mineral; cyclic voltammetry; methyl viologen; montmorillonite;
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