CO2 reduction on Pt electrocatalysts and its impact on H2 oxidation in CO2 containing fuel cell feed gas – A combined in situ infrared spectroscopy, mass spectrometry and fuel cell performance study

Adsorption and electrooxidation of ethylene glycol and its C2 oxidation products on a carbon-supported Pt catalyst: A quantitative DEMS study

“…Apparently, the lifetime of the weakly adsorbed oxalate is too low to allow C-C bond breaking, similar to the behavior of acetic acid [55,56]. For adsorption in the H upd region, especially at high H upd coverage at 0.06 V, slow reduction of oxalic acid to CO ad is possible as well, comparable to the reduction of CO 2 [57]. This trend is consistent with the findings of Berna et al [58] and Horanyi et al [18,59], who reported very slow formation of a stable adsorbate at cathodic potentials, with the maximum coverage of these adsorbates in the potential region between 0 and 0.1 V.…”

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

“…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,[30][31][32][33]41,47,50,59]. It was also postulated that CO 2 molecules only block hydrogen atoms, becoming blocked itself by water molecules and anions [26,44,46,51].…”

“…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,…”

Carbon Dioxide Electroreduction at Highly Porous Nitrogen and Sulfur Co-Doped Iron-Containing Heterogeneous Carbon Gel

“…close to 1, it is reasonable to expect that the linearly-bonded-CO is the main product of the reverse water gas shift reaction 34,36 pursued here. Figure 6b illustrates the oxidative stripping-type voltammograms (recorded at the Pt ring in CO 2 -saturated 0.1 mol dm −3 KHCO 3 ) of adsorbates of the CO 2 -reduction products generated during chronoamperometric measurements (for 10 s and at 900 rpm) executed upon application of different reduction potentials varying in the range from −1.3 to −1.7 V vs SCE (colored curves) to the glassy carbon (GC) disk electrode (covered by the catalytic Fe-NS-C carbon gel).…”

“…This phenomenon originated most likely from the CO 2 adsorption on Pt surface accompanied by the generation of some CO at H ads sites (on Pt) according to so called reverse water gas shift reaction. [34][35][36] The appearance of a small anodic peak at about −0.03 V in CO 2 -free electrolyte (solid line in Figure 6a) originated from the analogous (H ads -induced) surface reduction involving bicarbonates or carbonates and leading to traces of CO adsorbates. The second (more positive) small anodic peak appearing at about 0.2 V (Figure 6a, solid line) was attributed to the adsorption of anions (HCO 3 − /CO 3 2− ) and the formation of the surface Pt oxide film.…”