Abstract
The adsorption of formic species at a rhodium electrode in contact with electrolytic solutions of various pH (acid, neutral and alkaline media) was investigated in situ by Electrochemically Modulated Infrared Reflectance Spectroscopy (EMIRS). Here, using a spectroelectrochemical technique, the simultaneous presence at the rhodium surface of different chemisorption residues of a same molecule (e.g. HCOOH) is shown for the first time: linearly bonded CO, bridge-bonded CO and adsorbed formate COO −. A plausiblem mechanism is proposed by which both spectroscopic results and the electrochemical behaviour in voltammetric experiments of formic acid on rhodium, particularly as regards the poisoning of the electrocatalytic sites, may be interpreted.
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