In situ Infrared Spectroscopy at Electrodes: On the Adsorption of CO and CO₂ on Copper, Platinum and Gold

Abstract

In situ Infrared reflection absorption spectroscopy RAIRS of adsorbed CO and C 0 2 on copper, platinum and gold electrodes has been used to study the interaction between adsorbate and electrode and to identify products of reactions following the adsorption. COad on electrochemically roughened copper shows a Surface Enhanced Raman spectrum significantly different from the one recorded with RAIRS, this is attributed to the presence of different adsorption sites probed with these spectroscopies. Reduction of C 0 2 on platinum results in a CO-adsorbate with a vibrational behavior different from that of COad.

Electrochemical quartz crystal microbalance study on carbon oxides adsorption in the presence of electrosorbed hydrogen on Pd alloys with Pt and Rh

“…The differences in eps values for CO 2 and CO adsorption, higher for the Pd-Pt than Pd-Rh system, indicate that the products of both carbon oxides adsorption might not be the same. This observation is in line with the results of investigations of CO 2 and CO adsorption on polycrystalline Pt as well as Rh electrodes [1,6,7,12,42,52].…”

“…Some authors support the opinion stated by Breiter [14] that the products of CO 2 and CO adsorption are the same. However, there are also claims that the products of CO 2 adsorption are not totally identical with the products of CO adsorption [1,6,7,12,42,52]. The process of CO 2 /CO electrosorption depends on such factors as electrode material (a pure metal or alloy of a given surface composition as well as plane orientation for single crystal electrodes), adsorption potential, adsorption time, electrode surface morphology, method of electrode pretreatment and solution composition.…”

Comparative EQCM study on electrooxidation of carbon oxides adsorption products on noble metals and their alloys. Polycrystalline Pd-based systems

“…Some authors support the opinion stated by Breiter [27] that these adsorbates are the same. However, there are also claims that adsorption products of CO 2 reduction cannot be identified with the products of CO adsorption [26,41,49,57,71,128,129]. Brummer and Cahill [71] found that the interactions between adsorbed hydrogen and CO were repulsive, which was not the case for reduced CO 2 .…”

“…The nature of the product of CO 2 electrosorption (denoted in the literature as adsorbed CO 2 , reduced CO 2 or ''CO 2 '') on polycrystalline Pt and Rh electrodes in acidic solutions has been widely discussed in the literature [25,[27][28][29][30][31][32][33][36][37][38]40,41,[43][44][45][47][48][49][50]52,53,[56][57][58][59]. The authors generally agree on the presence of linearly and bridge bonded CO species on Pt surface after CO 2 electrosorption [25,[27][28][29]36,38,48,[50][51][52][53][56][57][58][59], together with possible other adsorbates like COH [28,38,40,45], CHO [43] and COOH species [25,28,…”

In situ electrochemical sensor for CO determination

“…[4], at 2100 cm ' and 2000 c m ' on copper electrodes. Westerhoff and Holze [5] also detected CO adsorbed on polycrystalline copper electrodes at 2100 cm-I in KClO, at a potendal positive relative to the potential at zero charge, and this band did not show any potential dependence.…”