(450h) Activity and Selectivity Trends on Bimetallic Thin Films for Electrochemical Carbon Dioxide Reduction
In this work, we have developed bimetallic electrocatalyst thin films by electron beam evaporation. Their activity and selectivity are investigated towards CO2 electroreduction in our three-compartment electrochemical cell that allows for excellent liquid and gaseous product detection . We target certain bimetallic arrangements, including phase segregated systems, overlayers and near surface alloys. These configurations allow us to capitalize on ensemble and/or ligand effects at the electrocatalyst surface  with the goal of targeting further reduced (> 2 electron) CO2 reduction products at high Faradaic efficiencies. By correlating thin film characterization before and after testing with results of electrochemical measurements, we draw surface structure-activity trends among this class of materials. Detailed understanding of these trends can be leveraged by the electrocatalysis community to move beyond pure copper based systems for electrochemical CO2 reduction.
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