Abstract
The dependence on the bulk concentration of formic acid of the nature of the adsorbed species formed at a rhodium electrode was investigated, using Electrochemically Modulated Infrared Spectroscopy (EMIRS),.CO ads species are formed., at all HCOOH bulk concentrations in the range 10 −5 to 10 M. Above 10 −2M the linearly bonded CO is predominent while the bridge-bonded CO species becomes the major species at the lowest concentrations. Furthermore the minor contribution of a third species, presumably a CO ads species engaged in a higher coordination site, is also detected.
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