Abstract
The chemisorption, from aqueous solutions, of hydroquinone and benzoquinone onto well-defined Pd(111) and Pd(100) electrode surfaces has been studied by tandem electrochemistry, high-resolution electron energy loss spectroscopy and in situ scanning tunneling microscopy. The results indicate that hydroquinone is oxidatively chemisorbed to form a quinonoid species that is oriented parallel to the surface but with a slight tilt in which one of the para-oxygens is topographically just higher than the other. The same surface species is obtained when adsorption is from aqueous benzoquinone.
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