Histidine-assisted synthesis of CeO2 nanoparticles for improving the catalytic performance of Pt-based catalysts in methanol electrooxidation. (17th October 2018)

• Record Type: Journal Article
• Authors: Dai, Shengdong; Zhang, Jinli; Fu, Yan; Li, Wei
• Is Part Of: New journal of chemistry. Volume 42:Number 22(2018)
• Page Start: 18159
• Page End: 18165
• Publication Date: 2018-10-17
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/c8nj03972k
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Histidine-assisted CeO2 Pt catalysts with more oxygen vacancies are synthesized to improve the catalytic performance in methanol electrooxidation. 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 Ce 3+ 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 g −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.