Doping palladium with tellurium for the highly selective electrocatalytic reduction of aqueous CO₂ to CO

Abstract

The doping of Pd with a small amount of Te can selectively convert CO2 to CO with a low overpotential.

The Effect of Noble Metal (M: Ir, Pt, Pd) on M/Ce2O3-γ-Al2O3 Catalysts for Hydrogen Production via the Steam Reforming of Glycerol

“…However, as the binding energies of Al 2p and Pt 4f overlap, the high amount of Al precludes any clear quantification of Pt species. For the Pd/CeAl catalyst (Figure 5b), the two peaks observed can be attributed to Pd 3d 5/2 (at 334.9 eV) and Pd 3d 3/2 (at 340.4 eV), which correspond to Pd 0 [90]. The binding energy of Pd 3d 5/2 was at 334.9 eV, indicating the presence of Pd in metallic state, and with an atomic surface concentration equal to 0.11%.…”

Partially Oxidized Palladium Nanodots for Enhanced Electrocatalytic Carbon Dioxide Reduction

“…Tailoring the surface tensile strain to alter the electronic structures can optimize the performance of Pd electrocatalysts . Doping Pd with Tellurium (Te) can stabilize the CO 2 .− intermediate to favor the desired carbon dioxide reduction reaction (CO 2 RR) and destabilize the adsorption of H to suppress unwanted H 2 evolution . Varying the particle size to change the ratio of the corner, edge, as well as terrace sites and alloying with a second metal to adjust the atomic arrangement can modulate the adsorption of CO 2 .− intermediate to accelerate the CO 2 RR so as to regulate the catalytic activity.…”

“…Previous studies have reported that the first electron transfer step of *CO 2 +e − →*CO 2 .− is generally regarded as the rate‐determining step (RDS) and results in a theoretical Tafel slope of 118 mV dec −1 (Scheme S1) . To obtain insights into the mechanism of CO formation on these electrodes, Tafel plots, an indication of kinetics for CO formation, were tested (Figure a).…”

“…the CO 2 C À intermediate to favor the desired carbon dioxide reductionr eaction (CO 2 RR) and destabilize the adsorption of H to suppress unwanted H 2 evolution. [3] Varying the particles ize to change the ratio of the corner,e dge, as well as terrace sites [4] and alloying with as econd metal to adjust the atomic arrangement [5,6] can modulate the adsorption of CO 2 C À intermediate to accelerate the CO 2 RR so as to regulate the catalytic activity.H owever,c ompared with metals like Au and Ag, Pdbased catalysts still have been limited to the high overpotential for CO production, requiring approximately À0.8 Vv s. reversible hydrogen electrode (RHE) to attain the maximum Faradaic efficiency (FE) of around9 0%. [2][3][4][5][6] To our best knowledge, an efficient approacht og reatlyl ower the overpotential of Pdbased catalysts is still lacking at present and an effective strategy is required to be applied in improving the catalytic activity of Pd-based catalysts.…”

“…*CO 2 C À is generally regarded as the rate-determining step (RDS) and results in at heoretical Ta fel slopeo f 118mVdec À1 (Scheme S1). [3,11,26] To obtain insights into the mechanism of CO formation on these electrodes, Tafel plots, an indication of kinetics for CO formation, were tested ( Figure 3a). The calculated Ta fel slopes for Air-Pd/PdO x ,P d/PdO x , and H 2 -Pd/PdO x catalysts are 110.42 mV dec À1 ,1 27.53 mV dec À1 , and 142.45 mV dec À1 ,r espectively.T he values of Pd/PdO x and Air-Pd/PdO x catalysts are close to the theoretical 118mVdec À1 , implyingt he criticalr ole of the first electron transfer step.…”