Selective electrocatalysis of acetaldehyde oxime reduction on (111) sites of platinum single crystal electrodes and nanoparticles surfaces |
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Authors: | P Rodríguez E Herrero J Solla-Gullón J M Feliu A Aldaz |
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Institution: | (1) Departamento de Química Física, Instituto de Electroquímica, Universidad de Alicante, Apdo. 99, 03080 Alicante, Spain |
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Abstract: | The reduction of acetaldehyde oxime (AO) in acid medium on platinum surfaces is a structure sensitive reaction that takes
place almost exclusively on (111) sites of Pt electrodes, and it is strongly inhibited on Pt(100) and Pt(110) surfaces. A
study using stepped electrodes with (111) terraces and monoatomic steps either with (100) and (110) orientation shows that
the activity of the electrode is also dependent on the terrace width, i.e., the wider the terrace is, the higher current density
is recorded and the more positive the peak potential for AO reduction appears. Moreover, in the electrodes with (100) step
sites, the reduction process appears at more negative potential than the electrodes with (111) step sites. Nanoparticles with
some preferential orientations were also tested for the AO reduction reaction to check the presence of (111) ordered domains
on the nanoparticles surface.
Dedicated to Teresa Iwasita on the occasion of her retirement and for her contributions to Electrochemistry. |
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Keywords: | Acetaldehyde oxime reduction Stepped surfaces Structure sensitive reaction Platinum single crystal Platinum nanoparticles |
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