Iodide-derived nanostructured silver promotes selective and efficient carbon dioxide conversion into carbon monoxide

Abstract

It is of great importance to design and develop highly active and selective electrocatalysts for the CO reduction reaction (CORR). In this communication, we report an iodide-derived nanostructured silver catalyst (ID-Ag) as an excellent CORR catalyst that is able to electrochemically reduce CO to CO with approximately 94.5% selectivity at the potential of -0.7 V in CO-saturated 0.5 M KHCO. This suggests that the highly electrochemical active surface area and adsorbed I anions onto the surfaces of the electrode contribute to the enhanced activity and selectivity of the nanostructured Ag electrocatalyst toward CO reduction.

AuCu Alloy Nanoparticle Embedded Cu Submicrocone Arrays for Selective Conversion of CO2 to Ethanol

“…Furthermore, the electrochemical active surface area (ECSA) of the sample was measured according to the obtained double layer capacitance ( C dl ) . As shown in Figure S2 (Supporting Information), the high electrochemical double layer capacitance ( C dl ) of AuCu/Cu‐SCA (2.06 mF cm −2 ) is higher than those of Cu‐SCA (1.76 mF cm −2 ) and Au NPs/CF (0.66 mF cm −2 ), implying that AuCu/Cu‐SCA also has higher ECSA and more exposed active sites, which is beneficial to enhance the CO 2 RR activity …”

Porous Palladium Nanomeshes with Enhanced Electrochemical CO2‐into‐Syngas Conversion over a Wider Applied Potential

“…The total Faradaic efficiencies (FEs) are almost up to 90 %, and as mall amount of energy loss results in at otal FE of less than 100 %. [20,35,50] The stabilityo fP dN Ms for the CO 2 -into-syngas conversion was studied as well ( Figure 4c). For Pd NMs, with increasing appliedpotential, the current densities of both CO and H 2 increase, with H 2 increasing at af aster rate, resultingi nag radual decrease in the ratio of CO to H 2 as the negative potential becomes larger.A pparently,t he CO/H 2 ratio of the produced syngas can be tuned by controlling the applied potential.…”

“…The Tafel slope of 63 mV dec À1 is close to the theoretical value of the reversible CO 2 /CO 2 C À process (59 mV dec À1 ), which is generally regarded as the rate-determining step for the CO 2 RR. [20,35,50] The stabilityo fP dN Ms for the CO 2 -into-syngas conversion was studied as well( Figure 4c). An egligible decay in current density is observed upon operating the system for 12 ha tt he applied potentials of À0.5, À0.6, and À0.7 V( vs. RHE).…”

“…[11,12] According to the acknowledged mechanism of CO 2 RR on metal-based catalysts and "electrocatalytic activity" volcanoes for HER on transition-metal elements, [13,14] palladium (Pd) is an excellent candidate for electrochemical syngas production. Therefore, it is necessary to engineert he active-site structure of electrocatalysts in terms of the size, [17,18] morphology, [19,20] grain boundary, [21,22] component, [23,24] and even active ligands of the electrocatalyst. [15,16] Althought he above cases give a credible explanation for no CO poisoning on Pd during CO 2 RR, the fact that the bulk Pd with polycrystalline structure still presentsp oor catalytic activity and selectivity is beyond doubt.…”

“…[15,16] Althought he above cases give a credible explanation for no CO poisoning on Pd during CO 2 RR, the fact that the bulk Pd with polycrystalline structure still presentsp oor catalytic activity and selectivity is beyond doubt. Therefore, it is necessary to engineert he active-site structure of electrocatalysts in terms of the size, [17,18] morphology, [19,20] grain boundary, [21,22] component, [23,24] and even active ligands of the electrocatalyst. [25,26] The size effect of the electrocatalyst, especially for sizes smaller than 10 nm, on the activity/selectivity in CO 2 RR has been explored in depth.…”