期刊
SCIENCE
卷 352, 期 6281, 页码 73-76出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aad8892
关键词
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资金
- Danish National Research Foundation [DNRF54]
- EU [GA 303492]
- Danish Strategic Research's project NACORR [12-133817]
- Danish Council for Independent Research
- Department of Mechanical Engineering at Massachusetts Institute of Technology
The high platinum loadings required to compensate for the slow kinetics of the oxygen reduction reaction (ORR) impede the widespread uptake of low-temperature fuel cells in automotive vehicles. We have studied the ORR on eight platinum (Pt)-lanthanide and Pt-alkaline earth electrodes, Pt5M, where M is lanthanum, cerium, samarium, gadolinium, terbium, dysprosium, thulium, or calcium. The materials are among the most active polycrystalline Pt-based catalysts reported, presenting activity enhancement by a factor of 3 to 6 over Pt. The active phase consists of a Pt overlayer formed by acid leaching. The ORR activity versus the bulk lattice parameter follows a high peaked volcano relation. We demonstrate how the lanthanide contraction can be used to control strain effects and tune the activity, stability, and reactivity of these materials.
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