Abstract
Ceria (CeO2) is one of the most widely used metal oxides of rare earth metals. Crucially, ceria has synergistic effects with various active metals via strong metal-support interactions. Therefore, it is attracting attention as a catalyst material for the electrochemical CO2 reduction reaction (eCO2RR). Cu–ceria composites are known to involve close interactions such as charge transfer between adjacent Cu and Ce atoms, but in-depth studies are needed to utilize the properties at the catalyst interface. In this study, Cu–ceria nanocubes (NCs) are synthesized, and the Cu–ceria NC interface is characterized at each step of the synthetic process. In addition, analysis of ceria nanorods (NRs) is used for comparison to identify how the CuO morphologies at the Cu/ceria interface differ, and the formation mechanism of CuO on ceria at each synthesis step is discussed in detail. Finally, analyses of valence states and interactions through charge transfer at the Cu/ceria interface reveal that Cu in a mixed oxidation state conducive to C2+ production is stabilized at the Cu/ceria interface. In the eCO2RR using Cu–ceria NC, the C2+ partial current density is about 32 times higher than that of the corresponding Cu–carbon catalyst.
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Acknowledgements
The authors gratefully acknowledge the financial support provided by National Research Foundation of Korea (NRF) grants funded by the Korean government (MSIT) (Nos. 2021R1A2C3007280, 2017M3D1A1040692, 2021R1A5A1084921, and 2022M3J7A1084660).
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Hong, S., Patra, K.K. & Oh, J. Morphology Evolution of CuO Supported on CeO2 and Its Role in Electrochemical CO2 Reduction. JOM (2024). https://doi.org/10.1007/s11837-024-06473-x
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DOI: https://doi.org/10.1007/s11837-024-06473-x