pH effect on electrocatalytic reduction of CO2 over Pd and Pt nanoparticles

Highly selective palladium-copper bimetallic electrocatalysts for the electrochemical reduction of CO2 to CO

“…4, comparing the TPD-MS spectra with those obtained from monometallic Pd nanoparticles, it was obvious to note that the maximum desorption temperature of CO from bimetallic PdCu nanoparticles was still significantly lower than that of CO from Pd due to the ligand effect with Cu on Pd-CO by modifying the electronic structure of the Pd constituent or lowering heat of CO adsorption in structural factor [40,41]. Thus, alloying Pd with Cu results in lowering the adsorption affinity of CO-like intermediate compared to Pd during CO 2 reduction [42]. In other words, the Pd nanoparticles that bind CO strongly are less active in CO 2 reduction process because they are poisoned by CO or other intermediates that form during CO 2 reduction, and consequently, hydrogen evolved from the competing water reduction, may be the main product observed [34].…”

Simultaneous electrocatalytic reduction of dinitrogen and carbon dioxide on conducting polymer electrodes

“…According to these results, we stopped the reactions at −0.35 V, and unfortunately, the metal-polymer combination of the electrode does not allow any operation at more negative values than −0.4 V due to the crumbling of the coating material from the metal surface due to the strong hydrogen evolution. Note that, H 2 evolution is always in competition with CO 2 reduction in aqueous systems [35].…”

Heterogeneous catalysts for catalytic CO2 conversion into value-added chemicals

“…Various works controlling the nano-structures of these metals have been reported to have high CO production from CO 2 RR; monodispersed Au or Ag nanoparticles [105][106][107][108], ligand-free Au nanoparticles with < 2 nm [109], inverse opal Au or Ag thin films [110,111], ultrathin Au nanowires [112], Au nanoneedles with sharp tips [113,114], concave rhombic dodecahedral Au nanoparticles with high-index facets [115], TiC-supported Au nanoparticles [116], hexagonal Zn particles [117], electrodeposited Zn dendrites [118], anodized Zn foil [119], small sized Pd nanoparticles with rich edge sites [120,121], Au electrode with adsorbed CN − or Cl − ions [122], Ag nanoparticles with surface-bonded oxygen [123], amine-capped Ag nanoparticles [124]. Although it is hard to compare their performance because of their different reaction conditions, the conversion of CO 2 to CO usually reaches 90~100% faraday efficiency at the relatively low overpotential of 0.4~0.7 V.…”