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In situ preparation of halogen modified silver nanocatalysts for efficient co-catalysis of CO2 reduction and glycerol oxidation.

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Title: In situ preparation of halogen modified silver nanocatalysts for efficient co-catalysis of CO2 reduction and glycerol oxidation.
Authors: Xin, Shixian1 (AUTHOR), Cui, Shuo1 (AUTHOR), Cao, Yutao1 (AUTHOR), Wu, Ying1 (AUTHOR), Tang, Tingting1 (AUTHOR), Cui, Wei1 (AUTHOR), Li, Zengxi1,2 (AUTHOR) lizengxi@ucas.ac.cn, Zhao, Hong1,3 (AUTHOR) hongzhao@ucas.ac.cn
Source: Electrochimica Acta. Jun2025, Vol. 524, pN.PAG-N.PAG. 1p.
Subjects: Activation energy, Nanoparticles, Density functional theory, Carbon dioxide, Energy consumption
Abstract: Electrocatalytic CO 2 reduction (ECR) to valuable feedstocks is considered as one of the most promising CO 2 resource utilization strategies. However, the challenge of balancing high Faradaic efficiency (FE) and large current density (j) of reduction products still remains. Herein, halogen anions X− (X = Cl, Br, I) modified Ag (Ag-X) nanocatalysts are constructed by in situ reduction of AgX nanoparticles under ECR conditions, which possess favorable ECR to CO performance. Among them, Ag-Cl exhibited up to 94.12 % FE CO and a j CO as high as 15.06 mA cm−2 at −0.75 V vs. RHE in KHCO 3 electrolyte. Particularly, a higher FE CO (98.96 %) is obtained in an ionic liquid (IL) electrolyte, and the FE CO could maintain over 90.00 % in a wide potential range. Density functional theory (DFT) calculations reveal that the halogen on the Ag nanocatalysts surface reduces the free energy barrier for the formation of essential intermediate *COOH, facilitating the ECR process. Notably, a two-electrode system is employed to generate value-added products, while energy consumption is reduced by 40.5 % through coupled anodic glycerol oxidation reaction (GOR) at a current density of 10 mA cm−2. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Electrocatalytic CO 2 reduction (ECR) to valuable feedstocks is considered as one of the most promising CO 2 resource utilization strategies. However, the challenge of balancing high Faradaic efficiency (FE) and large current density (j) of reduction products still remains. Herein, halogen anions X− (X = Cl, Br, I) modified Ag (Ag-X) nanocatalysts are constructed by in situ reduction of AgX nanoparticles under ECR conditions, which possess favorable ECR to CO performance. Among them, Ag-Cl exhibited up to 94.12 % FE CO and a j CO as high as 15.06 mA cm−2 at −0.75 V vs. RHE in KHCO 3 electrolyte. Particularly, a higher FE CO (98.96 %) is obtained in an ionic liquid (IL) electrolyte, and the FE CO could maintain over 90.00 % in a wide potential range. Density functional theory (DFT) calculations reveal that the halogen on the Ag nanocatalysts surface reduces the free energy barrier for the formation of essential intermediate *COOH, facilitating the ECR process. Notably, a two-electrode system is employed to generate value-added products, while energy consumption is reduced by 40.5 % through coupled anodic glycerol oxidation reaction (GOR) at a current density of 10 mA cm−2. [ABSTRACT FROM AUTHOR]
ISSN:00134686
DOI:10.1016/j.electacta.2025.146003