Experimental study demonstrates enhanced CO preferential oxidation by CeO2/Cu2O inverse catalysts, indicating that crystal plane engineering improves fuel cell catalyst performance.
The CO preferential oxidation is vital for proton exchange membrane fuel cell (PEMFC) stability, and the reverse catalyst design shows promise for improving its activity and durability. Herein, cubic and octahedral Cu 2 O crystals were synthesized via the solid-phase method. Subsequent decoration with CeO 2 yielded inverse CeO 2 /Cu 2 O catalysts, and oxidative treatment converted Cu 2 O to CuO, forming the final CeO 2 /CuO catalysts. The CeO 2 /Cu 2 O catalyst exhibits superior activity compared to CeO 2 /CuO, with CeO 2 /Cu 2 O-8 demonstrating the lowest complete CO conversion temperature (168 °C) and the widest operating window (168–200 °C). This enhanced performance originates from unsaturated copper sites, which facilitate faster electron transfer and oxygen vacancy formation while providing high specific surface area and elevated Ce 3+ content. This study established fundamental insights for designing inverse catalysts through crystal plane engineering in CO-PROX, potentially extending to other catalytic systems requiring precise surface control.
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Zhou et al. (2025) studied this question.
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