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Roles of hydroxyl and oxygen vacancy of CeO2·xH2O in Pd-catalyzed ethanol electro-oxidation

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Abstract

In the field of noble metal-catalyzed alcohol electro-oxidation reaction (AOR), huge attention is paid on the composition, size, facet, and structure of the metals, while the support engineering should also be emphasized. CeO2 has been widely used as an unique support in AOR, primarily due to its abundant oxygen vacancies (Ov). Herein, we report CeO2·xH2O nanoparticles with both massive hydroxyl groups (OH) and Ov remarkably enhance the catalytic activity and stability of Pd toward ethanol oxidation reaction (EOR). The CO striping experiments and density functional theory (DFT) calculations suggest that OH and Ov on CeO2·xH2O surface bring about a large downshift of Pd d-band center and a significant weakening of CO absorption on Pd. Moreover, OH and Ov also play synergic roles in the removal of toxic intermediates. Consequently, the important roles of OH and Ov of CeO2·xH2O are confirmed in Pd-catalyzed EOR. The facile CeO2·xH2O-enhanced strategy can contribute to the catalyst design for other energy conversion reactions.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (21875125, 22161033), the 111 Project (D20033), the Natural Science Foundation of Inner Mongolia Autonomous Region of China (2017JQ03), “Grassland Talent” Program and “Grassland Talent” Innovation Team of Inner Mongolia.

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Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, Inner Mongolia Engineering and Technology Research Center for Catalytic Conversion and Utilization of Carbon Resource Molecules, Inner Mongolia University, Hohhot, 010021, China

    Zhenyu Li, Jiefei Li, Kunhong Jiang, Dongmin Wang, Hang Wei & Haibin Chu

  2. College of Materials Science and Engineering, Jilin University, Changchun, 130022, China

    Zhenyu Li & Xiaotian Li

  3. State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, 130033, China

    Zhiming Shi

  4. College of Chemistry, Jilin University, Changchun, 130012, China

    Zexuan Zheng & Tianrun Zheng

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  1. Zhenyu Li
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  2. Jiefei Li
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Correspondence to Zhiming Shi, Xiaotian Li or Haibin Chu.

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Supporting information The supporting information is available online at http://chem.scichina.com and http://link.springer.com/journal/11426. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.

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Li, Z., Li, J., Zheng, Z. et al. Roles of hydroxyl and oxygen vacancy of CeO2·xH2O in Pd-catalyzed ethanol electro-oxidation. Sci. China Chem. 65, 877–884 (2022). https://doi.org/10.1007/s11426-021-1220-2

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  • DOI: https://doi.org/10.1007/s11426-021-1220-2

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