Tuning the activity of Pt alloy electrocatalysts by means of the lanthanide contraction
| Autor: | Jakob Schiøtz, María Escudero-Escribano, Paolo Malacrida, Ifan E. L. Stephens, Ulrik Grønbjerg Vej-Hansen, Martin Hangaard Hansen, Vladimir Tripkovic, Jan Rossmeisl, Amado Velázquez-Palenzuela, Ib Chorkendorff |
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| Rok vydání: | 2016 |
| Předmět: |
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 |
| Zdroj: | Science. 352:73-76 |
| ISSN: | 1095-9203 0036-8075 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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