Proceedings of nanoGe Fall Meeting 2021 (NFM21)
Publication date: 23rd September 2021
Catalysts play a vital role in the electrochemical reduction of CO2 to valuable products. Only based on effective catalysts, the CO2 electrolysis process can be advanced toward industrial application [1]. In this work, we present a Sb-Cu bimetallic material synthesized via one-pot microwave-assisted solvothermal route. The optimized Sb-Cu material achieves a highest CO selectivity of 96% and good CO partial current densities of 37.3 mA cm-2 and 74.0 mA cm-2 at -0.8 V and -1.2 V vs. the reversible hydrogen electrode (RHE), respectively. The Sb-Cu catalyst also displays good stability at current densities ranging from 5.6 to 100 mA cm-2. Additionally, for the first time, theoretical study reveals the critical roles of Sb in CO2 conversion to CO on this bimetallic material, including stabilizing stepped Cu surfaces selective for the reaction, lowering energy barriers for the formation of key intermediate and favouring CO desorption.
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