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Tuning the activity of Pt alloy electrocatalysts by means of the lanthanide contraction.
Escudero-Escribano, María; Malacrida, Paolo; Hansen, Martin H; Vej-Hansen, Ulrik G; Velázquez-Palenzuela, Amado; Tripkovic, Vladimir; Schiøtz, Jakob; Rossmeisl, Jan; Stephens, Ifan E L; Chorkendorff, Ib.
Affiliation
  • Escudero-Escribano M; Center for Individual Nanoparticle Functionality (CINF), Department of Physics, Technical University of Denmark, 2800 Lyngby, Denmark. Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA. ibchork@fysik.dtu.dk ifan@fysik.dtu.dk maria.escudero@fysik.dtu.dk.
  • Malacrida P; Center for Individual Nanoparticle Functionality (CINF), Department of Physics, Technical University of Denmark, 2800 Lyngby, Denmark.
  • Hansen MH; Center for Atomic-Scale Materials Design (CAMD), Department of Physics, Technical University of Denmark, 2800 Lyngby, Denmark. Nano-Science Center, Department of Chemistry, University of Copenhagen, 2100 Copenhagen, Denmark.
  • Vej-Hansen UG; Center for Individual Nanoparticle Functionality (CINF), Department of Physics, Technical University of Denmark, 2800 Lyngby, Denmark. Center for Atomic-Scale Materials Design (CAMD), Department of Physics, Technical University of Denmark, 2800 Lyngby, Denmark.
  • Velázquez-Palenzuela A; Center for Individual Nanoparticle Functionality (CINF), Department of Physics, Technical University of Denmark, 2800 Lyngby, Denmark.
  • Tripkovic V; Center for Atomic-Scale Materials Design (CAMD), Department of Physics, Technical University of Denmark, 2800 Lyngby, Denmark. Department of Energy Conversion and Storage, Technical University of Denmark, 4000 Roskilde, Denmark.
  • Schiøtz J; Center for Individual Nanoparticle Functionality (CINF), Department of Physics, Technical University of Denmark, 2800 Lyngby, Denmark. Center for Atomic-Scale Materials Design (CAMD), Department of Physics, Technical University of Denmark, 2800 Lyngby, Denmark.
  • Rossmeisl J; Center for Atomic-Scale Materials Design (CAMD), Department of Physics, Technical University of Denmark, 2800 Lyngby, Denmark. Nano-Science Center, Department of Chemistry, University of Copenhagen, 2100 Copenhagen, Denmark.
  • Stephens IE; Center for Individual Nanoparticle Functionality (CINF), Department of Physics, Technical University of Denmark, 2800 Lyngby, Denmark. Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. ibchork@fysik.dtu.dk ifan@fysik.dtu.dk maria.escudero@fysik.dt
  • Chorkendorff I; Center for Individual Nanoparticle Functionality (CINF), Department of Physics, Technical University of Denmark, 2800 Lyngby, Denmark. ibchork@fysik.dtu.dk ifan@fysik.dtu.dk maria.escudero@fysik.dtu.dk.
Science ; 352(6281): 73-6, 2016 Apr 01.
Article in En | MEDLINE | ID: mdl-27034369
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.
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Full text: 1 Database: MEDLINE Language: En Year: 2016 Type: Article
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Full text: 1 Database: MEDLINE Language: En Year: 2016 Type: Article