Methodical aspects of studying the electroreduction of nitrate on modified single crystal Pt(hkl) + Cu electrodes |
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| Authors: | A V Rudnev E B Molodkina M R Ehrenburg R G Fedorov A I Danilov Yu M Polukarov J M Feliu |
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| Institution: | 1.Frumkin Institute of Physical Chemistry and Electrochemistry,Russian Academy of Sciences,Moscow,Russia;2.Institute of Electrochemistry,University of Alicante,Alicante,Spain |
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| Abstract: | Technique of modification of basal faces Pt(hkl) by adatoms and epitaxial copper deposits is developed. Analysis of potentiostatic
current transients of copper deposition/dissolution and atomic force microscopy showed that the activity of Pt(hkl) faces
regarding the processes of copper nucleation and epitaxial growth increases in the sequence of Pt(111) < Pt(110) < Pt(100).
The reaction of nitrate anion reduction is sensitive towards the surface structure, not only in the case of platinum, but
also in the case of copper deposits (including a monolayer of adatoms). The highest process rate is observed for the Pt(100)
electrode modified by a monolayer of adatoms or islands of bulk copper; nitrate reduction at the lowest rate occurs at Pt(111)
+ Cu electrodes. Structure-sensitive competitive adsorption of background electrolyte and nitrate anions is the factor that
largely determines the kinetics of nitrate reduction on different faces of platinum single crystal and copper deposits. |
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