Effect of crystal violet on the kinetics of H sorption into Pd

Hydrogen insertion into Pd foil and Pd thin deposit on gold electrodes was studied in 0.1 M H 2SO 4 solution. Two paths are possible for hydrogen insertion: (a) indirect, with hydrogen adsorption at the surface followed by absorption and (b) direct absorption. The studies of hydrogen absorption in P...

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Bibliographic Details
Published in:Electrochimica acta 2006-04, Vol.51 (16), p.3356-3364
Main Authors: Birry, L., Lasia, A.
Format: Article
Language:English
Subjects:
Adsorption
Chemistry
Crystal violet
EIS
Electrochemistry
Exact sciences and technology
General and physical chemistry
Hydrogen adsorption and absorption in palladium
Hydrogen isotherms
Pd foil
Poison effect
Study of interfaces
Thin Pd deposits
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Summary:Hydrogen insertion into Pd foil and Pd thin deposit on gold electrodes was studied in 0.1 M H 2SO 4 solution. Two paths are possible for hydrogen insertion: (a) indirect, with hydrogen adsorption at the surface followed by absorption and (b) direct absorption. The studies of hydrogen absorption in Pd foil and thin deposits were carried out using classical transient and steady-state techniques and the electrochemical impedance spectroscopy. Presence of dissolved hydrogen in solution at positive potentials may lead to errors in the determination of the isotherms. The aim of this work is to understand how a poison, the crystal violet, can influence hydrogen insertion. In the presence of crystal violet, hydrogen adsorption is inhibited but absorption becomes more reversible. Analysis of the electrochemical data raises the possibility of the direct absorption mechanism.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2005.09.034