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초록

Recent studies suggest that the local acidic microenvironment and dissolution caused by organic crossover are critical factors to consider for the viability of anode catalysts in zero-gap CO2 electrolyzer. Despite their cost-effectiveness, the application of transition metal oxide catalysts for the anode in CO2 electrolyzer has been limited due to their dissolution in locally acidic environments. In this work, we investigate the feasibility of transition metal oxides as effective anode materials for zero-gap CO2 electrolysis by using acidic stable CoMn spinel oxide. The CoMn spinel oxide catalyst exhibited promising durability in the local acidic microenvironment. However, accelerated dissolution was observed in the presence of ethanol. We propose that the participation of lattice oxygen during the electro-oxidation of unhydrated aldehydes induces the collapse of the oxide matrix, thereby leading to the rapid dissolution of transition metal oxides. Our findings highlight the potential of transition metal oxides as viable anode materials for CO2 electrolyzer targeting C1 product.

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