In-doped SnO₂ (ITO) cathodes bearing Ag, Cu and bimetallic Ag/Cu nanoparticulate arrays (cathode systems ITO//Ag, ITO//Cu and ITO//Ag/Cu, respectively) were prepared by a potentiostatic double-pulse technique and employed for studying the multi-step charge-transfer kinetics of CO₂ electrochemical reduction (CO₂ER) in propylene carbonate solution. Our results demonstrated, on one hand, that the current exchange density of the rate-determining step (rds) for the CO₂ electrochemical reduction (i_o,rds) depends, predominantly, on the values achieved by the outer-Helmholtz plane (OHP) potential (Δψ_OHP,rds) on the three cathode systems here explored. Furthermore, these results showed that a large Δψ_OHP,rds (−647 mV) promoted a large i_o,rds (1.09 × 10⁻² A⋅ cm⁻²) for CO₂ reduction at the cathode system ITO//Cu, whereas a small Δψ_OHP,rds (−168 mV) produced a small i_o,rds (2.05 × 10⁻⁴ A⋅ cm⁻²) for CO₂ reduction at the cathode system ITO//Ag. In contrast, intermediate values of Δψ_OHP,rds and i_o,rds (−333 mV, 1.09 × 10⁻³ A⋅ cm⁻²) were found for CO₂ reduction on the cathode system ITO//Ag/Cu, demonstrating that the individual electrocatalytic properties of Ag and Cu can be coupled in a bimetallic array to intentionally tune the CO₂ER rate in nonaqueous solvents having low proton availability.

通过恒电位双脉冲制备负载Ag，Cu和双金属Ag / Cu纳米颗粒阵列（分别为ITO // Ag，ITO // Cu和ITO // Ag / Cu阴极）的In-SnO ₂（ITO）阴极。技术并用于研究碳酸亚丙酯溶液中CO ₂电化学还原（CO ₂ ER）的多步电荷转移动力学。一方面，我们的结果表明，CO ₂电化学还原速率决定步骤（rds）的电流交换密度（i _o，rds）主要取决于外部亥姆霍兹平面（OHP）达到的值）电位（ΔψOHP _，rds）在这里探索了三个阴极系统。此外，这些结果显示，大Δψ _OHP，RDS（-647毫伏）促进了大我_O，RDS（1.09×10 ^-2 A⋅厘米^-2）为CO ₂在阴极系统ITO //铜还原，而小Δψ _OHP，RDS（-168毫伏）产生的小我_O，RDS（2.05×10 ^-4 A⋅厘米^-2）为CO ₂在阴极系统ITO //银还原。与此相反，Δψ的中间值_OHP，RDS和我_O，RDS（-333毫伏，1.09×10 ^-3 A⋅厘米在阴极系统ITO // Ag / Cu上发现了^-2）用于还原CO ₂，这表明Ag和Cu的各个电催化性能可以在双金属阵列中耦合，从而有意地调节低水位非水溶剂中的CO ₂ ER速率质子可用性。