Efficient CO 2 electroreduction to CO using nanostructured Ag-based catalysts Ola Bajouk 1,2,3 , Michel Moulins 1,2 , Bertrand Reuillard 2 , Elise Lorenceau 3 , Pascale Chenevier 1 (1) Univ. Grenoble Alpes, CEA, CNRS, GrenobleINP, IRIG, SYMMES, 38000, Grenoble, France, (2) Univ. Grenoble Alpes, CEA, CNRS, IRIG, LCBM, 38000, Grenoble, France, (3) Univ. Grenoble Alpes, CNRS, LIPhy, 38000, Grenoble, France The electrochemical reduction of CO 2 into value-added products represents a viable pathway to mitigate CO2 atmospheric concentration as well as allow for the development of a circular carbon economy. Carbon monoxide (CO), one of the two components of syngas with H 2 , is a key target product with extensive industrial applications. 1,2 This work investigates the performance of silver nanowires (AgNWs) as catalysts for the selective reduction of CO 2 to CO, considering their excellent electrical conductivity and interconnected nanowire network structure. AgNWs were employed at gas diffusion electrodes (GDEs) and tested in two electrochemical configurations: a three-electrode flow cell and a zero-gap electrolyzer. Catalyst performance was evaluated under varying applied potentials, current densities, and CO2 flow rates. AgNWs demonstrated CO selectivity exceeding 90% in both the flow cell setup (at Eapp= -1.03V to -1.13V vs RHE) and within the zero-gap electrolyzer cell (at 3V to 3.2V). Stability tests revealed a stable catalytic performance with structural alteration at different current densities. Lower CO 2 flow rates were investigated to simulate conditions more relevant to the use of CO 2 from diluted sources. Findings showed that higher flow rates reduced conversion efficiency, whereas lower flow rates improved efficiency while maintaining reasonable CO selectivity. These findings highlight the potential of AgNWs as efficient and selective catalysts for CO 2 electroreduction.
References 1. Aresta, M.; Dibenedetto, A.; Angelini, A. Catalysis for the Valorization of Exhaust Carbon: From CO2 to Chemicals, Materials, and Fuels. Technological Use of CO2. Chem. Rev. 2014, 114 (3), 1709–1742. https://doi.org/10.1021/cr4002758. 2. Electrochemical CO2 Reduction – A Critical View on Fundamentals, Materials and Applications. CHIMIA 2015, 69 (12), 769. https://doi.org/10.2533/chimia.2015.769.
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