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Hydroxyl-riched Ceria Hydrate Nanoparticles Enhancing the Alcohol Electrooxidation Performance of Pt Catalysts

Abstract

The exploration of anode catalysts with high activity and stability for direct alcohol fuel cell (DAFC) has been a big challenge for decades. Metal oxides, such as CeO2 with oxygen vacancies, are widely investigated in the promotion of Pt-based electrocatalysts for alcohol oxidation. Hydroxyl-riched CeO2·xH2O, which is capable of affording OH groups directly for reacting with CO to re-activate the nearby metal catalyst, may surpass CeO2 in alcohol electrooxidation reactions. Herein, small CeO2·xH2O nanoparticles with plenty of surface OH groups have been prepared by a tert-butylamine-assisted solvothermal method, and then ultrasonic mixed with Pt/CNTs (CNTs = carbon nanotubes). As a proof-of-concept experiment, the CeO2·xH2O/Pt/CNTs catalyst containing the tert-butylamine-modified CeO2·xH2O nanoparticles achieves a high peak current density of 2304 mA/mg for methanol oxidation in the alkaline medium, which is remarkably higher than those of the calcined counterpart (CeO2/Pt/CNTs, 814 mA/mg) and Pt/CNTs (520 mA/mg). After chronoamperometry test for 1200s, the retained current density of CeO2·xH2O/Pt/CNTs (570 mA/mg) is also much higher than those of CeO2/Pt/CNTs (163 mA/mg) and Pt/CNTs (10 mA/mg). The advantage of CeO2·xH2O nanoparticles over CeO2 nanoparticles has been further confirmed by ethylene glycol and glycerol oxidation reactions, and also found effective on other alcohol oxidation catalysts such as Pt/C, Pd/C and PtRu/C. Therefore, this strategy may provide an alternative for the design of anode catalysts in DAFC with high performance and low cost.

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Supplementary files

Publication details

The article was received on 16 Oct 2017, accepted on 04 Jan 2018 and first published on 04 Jan 2018


Article type: Paper
DOI: 10.1039/C7TA09071D
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Hydroxyl-riched Ceria Hydrate Nanoparticles Enhancing the Alcohol Electrooxidation Performance of Pt Catalysts

    Z. Li, J. Zhou, L. Tang, X. Fu, H. Wei, M. Xue, Y. Zhao, C. Jia, X. Li, H. Chu and Y. Li, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C7TA09071D

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