Shape-Dependent Electrocatalytic Reduction of CO2 to CO on Triangular Silver Nanoplates

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• 作者：Subiao LiuHongbiao Tao ; Li Zeng ; Qi Liu ; Zhenghe Xu ; Qingxia LiuJing-Li Luo
• 刊名：Journal of the American Chemical Society
• 出版年：2017
• 出版时间：February 15, 2017
• 年：2017
• 卷：139
• 期：6
• 页码：2160-2163
• 全文大小：341K
• ISSN：1520-5126

文摘

Electrochemical reduction of CO₂ (CO₂RR) provides great potential for intermittent renewable energy storage. This study demonstrates a predominant shape-dependent electrocatalytic reduction of CO₂ to CO on triangular silver nanoplates (Tri-Ag-NPs) in 0.1 M KHCO₃. Compared with similarly sized Ag nanoparticles (SS-Ag-NPs) and bulk Ag, Tri-Ag-NPs exhibited an enhanced current density and significantly improved Faradaic efficiency (96.8%) and energy efficiency (61.7%), together with a considerable durability (7 days). Additionally, CO starts to be observed at an ultralow overpotential of 96 mV, further confirming the superiority of Tri-Ag-NPs as a catalyst for CO₂RR toward CO formation. Density functional theory calculations reveal that the significantly enhanced electrocatalytic activity and selectivity at lowered overpotential originate from the shape-controlled structure. This not only provides the optimum edge-to-corner ratio but also dominates at the facet of Ag(100) where it requires lower energy to initiate the rate-determining step. This study demonstrates a promising approach to tune electrocatalytic activity and selectivity of metal catalysts for CO₂RR by creating optimal facet and edge site through shape-control synthesis.