Journal
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
Volume 28, Issue 7, Pages 1224-1232Publisher
SPRINGER
DOI: 10.1007/s12613-020-2076-2
Keywords
direct methanol fuel cell; platinum; cerium dioxide-carbon; electrocatalyst; methanol oxidation
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Funding
- National Natural Science Foundation of China [51774145]
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The Pt/CeO2-C catalysts with CeO2 pre-calcined at 300-600 degrees C showed improved methanol electro-oxidation catalytic activity compared to commercial Pt/C catalysts, with the catalyst pre-calcined at 400 degrees C displaying the highest electrochemical surface area and I-f/I-b ratio, indicating enhanced CO tolerance.
Pt/CeO2-C catalysts with CeO2 pre-calcined at 300-600 degrees C were synthesized by combining hydrothermal calcination and wet impregnation. The effects of the pre-calcined CeO2 on the performance of Pt/CeO2-C catalysts in methanol oxidation were investigated. The Pt/CeO2-C catalysts with pre-calcined CeO2 at 300-600 degrees C showed an average particle size of 2.6-2.9 nm and exhibited better methanol electro-oxidation catalytic activity than the commercial Pt/C catalyst. In specific, the Pt/CeO2-C catalysts with pre-calcined CeO2 at 400 degrees C displayed the highest electrochemical surface area value of 68.14 m(2)center dot g(-1) and I-f/I-b ratio (the ratio of the forward scanning peak current density (I-f) and the backward scanning peak current density (I-b)) of 1.26, which are considerably larger than those (53.23 m(2)center dot g(-1) and 0.79, respectively) of the commercial Pt/C catalyst, implying greatly enhanced CO tolerance.
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