期刊
JOURNAL OF POWER SOURCES
卷 248, 期 -, 页码 356-362出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2013.09.086
关键词
Platinum-ruthenium black; Alloying; Methanol oxidation; Direct methanol fuel cell
资金
- National Basic Research Program of China (973 Program) [2012CB932800]
- National Natural Science Foundation of China [21276158]
- Shanghai Science and Technology Committee [11DZ1200400, 12ZR1431200]
- Knowledge Innovation Engineering of the Chinese Academy of Sciences [12406, 124091231]
- U.S. National Science Foundation [HRD-08-33180]
- Direct For Education and Human Resources
- Division Of Human Resource Development [0833180] Funding Source: National Science Foundation
Synthesis of small particle size, highly alloyed PtRu black catalysts for application in direct methanol fuel cells remains a substantial challenge. In this work, PtRu (1:1) black catalysts have been synthesized using Pt carbonyl complex and RuCl3 as initial precursors and magnesia nanoparticles as sacrificial templates. Magnesia is used to prevent the aggregation of synthesized PtRu nanoparticles during heat treatment, and thus promoting the controllable formation of PtRu black of high alloy composition and small particle size. X-ray diffraction shows that the PtRu black nanoparticles have a single-phase face-centered cubic structure and that the degree of alloying increases with treatment temperature. The mean particle size of the PtRu black catalysts, after heat-treatment from 250 to 300 degrees C, is found to be ca. 3 nm, only slightly larger than that of commercial Johnson-Matthey PtRu black, but more highly alloyed. Electrochemical measurements indicate that the catalytic activity for methanol oxidation on in-house prepared PtRu black catalysts is about twice that of the commercial product, with greater durability, indicating that the degree of alloying between Pt and Ru plays an important role in improving both catalytic activity and durability of the catalysts when used for methanol oxidation. (C) 2013 Elsevier B.V. All rights reserved.
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