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HYDROGEN ADSORPTION ON SILVER CATHODES IN PERCHLORIC ACID SOLUTIONS | ||
Journal of Sciences, Islamic Republic of Iran | ||
مقاله 9، دوره 1، شماره 2، خرداد 1990 اصل مقاله (870.13 K) | ||
چکیده | ||
In this paper studies of overvoltage and capacitance measurements at silver cathodes in aqueous perchloric acid at room temperature are described. Capacitances were deduced from open-circuit potential decay measurements. The increase of overvoltage and the growth of the measured capacitances in the course of electrolysis are attributed to a growing pseudocapacitance component. This is analysed in terms of an increasing coverage, ? ,of the cathode by adsorbed hydrogn atoms. The increase in surface coverage from the beginning up to several days of cathodisation ranged up to 2% of a monolayer for silver in 0.1 mol HC1 ,and up toO.9% of a monolayer in 1 mol 1-' HCIO,. The increase in overvoltage at constant current density and the increase in electrode capacitance at constant overvoltage with the logarithm of the cathodic charge (-Q) were linear up to Q values of about -60° C . This increase in overvoltage and pseudocapacitance might be attributed to the adsorption and absorption of hydrogen atoms by silver cathodes | ||
عنوان مقاله [English] | ||
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چکیده [English] | ||
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آمار تعداد مشاهده مقاله: 862 تعداد دریافت فایل اصل مقاله: 907 |