HYDROGEN ADSORPTION ON SILVER CATHODES IN PERCHLORIC ACID SOLUTIONS
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...
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| Format: | Article |
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| Language: | English |
| Published: |
University of Tehran
1990-03-01
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| Series: | Journal of Sciences, Islamic Republic of Iran |
| Online Access: | https://jsciences.ut.ac.ir/article_31390_7dc9ea309e46b8957443de2eaf559e8d.pdf |
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| Summary: | 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 |
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| ISSN: | 1016-1104 2345-6914 |