Impedance analysis of hydrogen adsorption on palladium in 0.1 M NaOH solution

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The behaviour of hydrogen adsorption on palladium has been investigated by a.c. impedance measurements in 0.1 M NaOH solution of pH 13 at 298 K. The electrode impedance has been measured by superimposing an a.c. voltage of 5 mV amplitude ranging between 10(-1) and 10(4) Hz on a d.c. potential range from -0.76 to 0.44 V (standard hydrogen electrode (SHE)). The equivalent circuit representing the hydrogen adsorption reaction is proposed from the analysis of the frequency dependence of electrode admittance. The capacitance, arising from the adsorbed hydrogen, has been determined as a function of applied potential by complex non-linear least-squares curve fitting method based on the proposed equivalent circuit. As the cathodic applied potential increased from -0.36 to -0.76 V (SHE), the adsorption capacitance considerably increased owing to the enhanced coverage of hydrogen adsorbed on the palladium surface. In the applied potential range from -0.36 to 0.24 V (SHE), the adsorption capacitance exhibited a minimum value, characterizing a double-layer region.
Publisher
Elsevier Science Sa
Issue Date
1991-10
Language
English
Article Type
Article
Citation

JOURNAL OF ALLOYS AND COMPOUNDS, v.176, no.1, pp.97 - 103

ISSN
0925-8388
URI
http://hdl.handle.net/10203/60032
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