Electrochemical CO 2 reduction to CO on dendritic Ag–Cu electrocatalysts prepared by electrodeposition

Rational Design of Ag‐Based Catalysts for the Electrochemical CO2 Reduction to CO: A Review

“…reported that Ag-Cu dendrite alloys prepared through an electrodeposition method were highly active toward the selective ECR to CO at relatively low reduction overpotentials with reduced usage of Ag. [120] The research also revealed that the elemental distributionsa nd ratios in Ag-Cu alloys greatlyi nfluenced the selectivity and activity for the ECR to CO. As shown in Figure 11,a lthough the Ag 100 dendrite catalyst achievedt he highest CO FE at À1.7 V vs. saturated calomel electrode (SCE) in 0.5 m KHCO 3 ,t he alloyed Ag 84 Cu 16 dendrite catalyst exhibited aC OF E2 .5 times highert han that of Ag 100 at À1.3 Vv s. SCE. Overall,t he CO FE of Ag-Cu NPs decreased gradually with the increase of the Cu content in the Ag-Cu alloys while the H 2 FE increased (Figure 11 aa nd b).…”

“…[121] As shown in Figure 12, the Ag@Cu-7 catalyst( synthesizedw ith ah eating time of 7min) with aA gto-Cu molarr atio of 1:0.2 presented the highest CO FE of 82 % at À1.06 Vv s. RHE in CO 2 -saturated 0.1 m KHCO 3 solution, which was significantly higher compared with the corresponding monometallic counterparts Cu (8 %) and Ag (72 %) prepared accordingt othe same synthetic method. Furtheri nvestigation demonstrated that the enhanced activity of Ag@Cu-7 could be ascribed to, on the one hand, the addition of Cu with Interestingly,a lthough CO is the predominant reaction product for Ag-Cu in the selective ECR, which is derived mainly from synergistic reactions rather than pure dilution effects between Ag and Cu, [119][120][121] it should be noted that Cu and Cubased catalysts including Ag-Cu also have the potentialt o convert CO 2 to various hydrocarbonss uch as C 2 H 6 ,C H 4 ,o r/and oxygenates such as C 2 H 5 OH, CH 3 OH,H CHO. [122][123][124][125][126] Further studies demonstrated that the selectivity and activity of these bi-metallicA g-Cu electrocatalysts for the ECR to CO were closely relatedt ot he atomic distributions and ratios of Ag and Cu.…”

“…(a) CO FE, (b) H 2 FE, (c) CO mass activity on different catalysts such as Ag,Ag-Cu, and Cu dendrites. Reproduced with permission from Ref [120]. Copyright2 016, Elsevier.…”

Looking Back and Looking Ahead in Electrochemical Reduction of CO2

“…[3a,b,4] Choi and co-workers fabricated AgÀ Cu catalysts by electrodeposition method. [22] Even though the faradaic efficiency of AgÀ Cu toward CO was lower than pure Ag comparing between the maximum values of each catalyst, interestingly, Ag mass-normalized faradaic efficiency (mass activity) was highest using Ag 57 Cu 43 at a cathodic potential of À 1.5 V (vs. SCE). Furthermore, introduction of In into Ag dendrites lead to higher catalytic activity and selectivity for CO 2 reduction to CO by increasing intensity ratio of Ag(220) to Ag(210) facets and suppressing the competitive hydrogen formation in highly negative potential regions.…”

A comparative study of silver electrodeposition from pyrophosphate-cyanide and high concentration cyanide electrolytes in the presence of brighteners

“…Nowadays, also silver alloy electrodeposition, especially Cu-Ag [25][26][27] and Sn-Ag [28][29][30] coatings, has become a widely studied research area for various industrial purposes, mainly due to combining of mechanical strengthening with high electrical conductivity and corrosion resistance by a low cost, versatile technique. The electrodeposition technique is well designed for obtaining smooth and coherent deposits by means of using organic and inorganic additives to improve electrocrystallization and growth stages.…”