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Tuning the activity of Pt alloy electrocatalysts by means of the lanthanide contraction
- Source :
- Science. 352:73-76
- Publication Year :
- 2016
- Publisher :
- American Association for the Advancement of Science (AAAS), 2016.
-
Abstract
- 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.
- Subjects :
- Lanthanide contraction
Multidisciplinary
Inorganic chemistry
chemistry.chemical_element
Mineralogy
Terbium
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
Catalysis
Samarium
Cerium
chemistry
Lanthanum
Dysprosium
0210 nano-technology
Platinum
Subjects
Details
- ISSN :
- 10959203 and 00368075
- Volume :
- 352
- Database :
- OpenAIRE
- Journal :
- Science
- Accession number :
- edsair.doi.dedup.....9563530616f843830f17be9108992dcc