Electrografting amines onto silver nanoparticle-modified electrodes for electroreduction of CO₂ at low overpotential

Abstract

Reducing carbon dioxide (CO2) to value-added synthons in a selective and efficient manner remains a sizable challenge to CO2 conversion research. Although many electrocatalysts have been reported to date, those...

CO2 Electrolysis via Surface-Engineering Electrografted Pyridines on Silver Catalysts

“… 48 With the Ag surface ready, aminopyridine derivatives were then covalently immobilized on the silver surface through diazotation using NaNO 2 (2 mM) in HCl (0.5 M) solution to form pyridines-N 2 + ( Figure 2 a). 47 , 49 Once the diazotation reaction was completed, the diazonium cation was reduced on the electrode surface in situ between −0.5 and 0.05 V vs Ag/AgCl using five cyclic voltammetry (CV) cycles at a scan rate of 50 mV/s shown in Figure 2 b. 24 , 50 A characteristic irreversible reduction peak was used to identify the reduction of diazonium salt to form the aryl radical intermediate, promptly followed by the formation of a covalent bond to the electrode surface and the release of N 2 gas.…”

“…23 With the Ag surface ready, amino pyridine derivatives were then oxidized to diazonium cations through electrochemical reduction, and simultaneously electrografted onto an electrode surface in situ (Figure 2a). 22 In line with the motivation for controlling the distance between the pyridine ring and the Ag surface, we used pyridine complexes of 1-3 carbon chains, denoted as Ag-EPy-1, Ag-EPy-2 and Ag-EPy-3. Figure 2b and S2a depicts the electrografting of EPy-2, and Ag-EPy-2, where peak surface coverage was achieved after 3-5 cyclic voltammetry (CV) cycles.…”

“…To ensure a bond between the ligand of the pyridine molecular catalyst and the silver support that can withstand a reducing potential, the novel field of electrografting shows promise. 46 , 47 …”

Electroreduction of carbon dioxide to formate using highly efficient bimetallic Sn–Pd aerogels

“…11 There has been considerable progress on improving electrocatalytic activity for CO 2 reduction by introducing binding site diversity. 12 Although various metals, such as Pd, 13 Pb, 14 Bi, 15,16 Sn, [17][18][19] Ag, 20 and In 21 themselves demonstrate high selectivity for formate production, recent reports show that bimetallic alloys of these metals can increase catalytic activity even further. 22,23 Additionally, Sn-based [24][25][26][27] and Pd-based 28,29 bimetallic catalysts are superior in several aspects where monometallic catalysts are lacking: in reducing large overpotentials and improving surface stability towards CO 2 RR.…”

Electrochemical Reduction of CO2: A Review of Cobalt Based Catalysts for Carbon Dioxide Conversion to Fuels

“…However, their wide use applications for CO 2 RR have been hampered by their high cost. Therefore, explorations to find the noble metal-free efficient catalysts for CO 2 RR have led to the discovery of various catalysts such as different types of metals, metal oxides, supported single atoms and single-site catalysts, transition metals supported/embedded on graphene, bimetal and metal/carbon hybrids, porphyrin like structures functionalized by metals, MOFs, colloidal nanocrystals and doped nanostructures [ 88 , 89 , 90 , 91 , 92 , 93 , 94 , 95 , 96 , 97 , 98 , 99 , 100 , 101 ]. Current challenges to the electrocatalysts are their stability, the reduction onset potential, current density, and Faradic efficiency.…”