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Histidine-assisted synthesis of CeO2 nanoparticles for improving the catalytic performance of Pt-based catalysts in methanol electrooxidation

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Abstract

His-CeO2 nanoparticles were synthesized under urea hydrolysis conditions using histidine as the growth-directing agent. Characterization by transmission electron microscopy, powder X-ray diffraction spectroscopy, photoluminescence spectroscopy and X-ray photoelectron spectroscopy, indicated that the His-CeO2 nanoparticles, which had a particle size of 12.2 nm, possessed a higher content of Ce3+ species and oxygen vacancies than bare CeO2 nanoparticles. Pt/His-CeO2-C electrocatalysts were constructed by using His-CeO2 nanoparticles as co-catalysts and exhibited enhanced catalytic performance in the methanol oxidation reaction. Because His-CeO2 co-catalysts supply sufficient OHads sites and show strong interactions with Pt species, Pt/His-CeO2-C had better antipoisoning properties than Pt/CeO2-C. In cyclic voltammetry tests, the mass activity for Pt/His-CeO2-C was up to 1116.9 A gāˆ’1, which is approximately 2.9 and 2.2 times greater than that of Pt/C-Z and commercial Pt/C-JM, respectively. These results pave the way for manufacturing Pt-based electrocatalysts for methanol electrooxidation with biomolecule-mediated modulation of the synergistic effects between the Pt species and metal oxides.

Graphical abstract: Histidine-assisted synthesis of CeO2 nanoparticles for improving the catalytic performance of Pt-based catalysts in methanol electrooxidation

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Publication details

The article was received on 06 Aug 2018, accepted on 01 Oct 2018 and first published on 03 Oct 2018


Article type: Paper
DOI: 10.1039/C8NJ03972K
Citation: New J. Chem., 2018, Advance Article
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    Histidine-assisted synthesis of CeO2 nanoparticles for improving the catalytic performance of Pt-based catalysts in methanol electrooxidation

    S. Dai, J. Zhang, Y. Fu and W. Li, New J. Chem., 2018, Advance Article , DOI: 10.1039/C8NJ03972K

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