Most studies on electrochemical CO₂ reduction reaction use pure CO₂, which requires extra energy for CO₂ capture and enrichment from atmosphere. Herein, nanoconfined ionic liquids are introduced into porous atomically dispersed nickel-nitrogen-carbon (Ni-N-C) catalysts to enrich local CO₂ concentration and increase the CO₂RR kinetics. A series of high-CO₂-solubility ionic liquids (ILs) were impregnated into the pores of the columnar Ni-N-C catalyst to alter the CO₂-Ni sites interactions and create a solid/liquid interface with high CO₂ concentration. The optimal Ni-N-C/[Bmim][PF₆] composite outperforms the Ni-N-C catalyst for pure CO₂ electroreduction with a maximum FE_CO of 99.6% and 2.7-fold larger j_CO. The high solubility of CO₂ in ILs compared to aqueous electrolyte enables direct electrolysis of CO₂ at low concentrations. When fed with 5–10% (v/v) CO₂, the Ni-N-C/[Bmim][PF₆] composite exhibited up to 1.5-fold higher FE_CO and a 68% increase of j_CO, in comparison to Ni-N-C, and robust stability over 30 h.

大多数关于电化学 CO ₂还原反应的研究使用纯 CO ₂，这需要额外的能量来捕获和从大气中富集CO ₂。在此，纳米限制离子液体被引入多孔原子分散的镍-氮-碳 (Ni-NC) 催化剂中，以增加局部 CO ₂浓度并增加 CO ₂ RR 动力学。一系列高CO ₂溶解度的离子液体(IL) 被浸入柱状Ni-NC 催化剂的孔中，以改变CO ₂ -Ni 位点的相互作用并产生具有高CO ₂浓度的固/液界面。最佳 Ni-NC/[Bmim][PF ₆] 复合材料优于 Ni-NC 催化剂，用于纯 CO ₂电还原，最大 FE _CO为 99.6%，j _CO大 2.7 倍。与水性电解质相比，CO ₂在 IL 中的高溶解度能够在低浓度下直接电解 CO ₂。当用5-10％（体积/体积）CO进料₂，在Ni-NC / [BMIM] [PF ₆ ]复合表现出高达1.5倍高的FE _CO和增加了68％Ĵ _CO相比，对于Ni -NC，并且在 30 小时内具有强大的稳定性。