Tuning the activity of Pt alloy electrocatalysts by means of the lanthanide contraction

Maria Escudero Escribano; Paolo Malacrida; Martin Hangaard Hansen; Ulrik Grønbjerg Vej-Hansen; Amado Andres Velazquez-Palenzuela; Vladimir Tripkovic; Jakob Schiøtz; Jan Rossmeisl; Ifan E. L. Stephens; Ib Chorkendorff

doi:10.1126/science.aad8892

Tuning the activity of Pt alloy electrocatalysts by means of the lanthanide contraction

Maria Escudero Escribano, Paolo Malacrida, Martin Hangaard Hansen, Ulrik Grønbjerg Vej-Hansen, Amado Andres Velazquez-Palenzuela, Vladimir Tripkovic, Jakob Schiøtz, Jan Rossmeisl, Ifan E. L. Stephens, Ib Chorkendorff

Research output: Contribution to journal › Journal article › Research › peer-review

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.

Original language	English
Journal	Science
Volume	352
Issue number	6281
Pages (from-to)	73-76
Number of pages	4
ISSN	0036-8075
DOIs	https://doi.org/10.1126/science.aad8892
Publication status	Published - 2016

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title = "Tuning the activity of Pt alloy electrocatalysts by means of the lanthanide contraction",

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.",

keywords = "Reports, CHEMISTRY",

author = "Escribano, {Maria Escudero} and Paolo Malacrida and Hansen, {Martin Hangaard} and Vej-Hansen, {Ulrik Gr{\o}nbjerg} and Velazquez-Palenzuela, {Amado Andres} and Vladimir Tripkovic and Jakob Schi{\o}tz and Jan Rossmeisl and Stephens, {Ifan E. L.} and Ib Chorkendorff",

year = "2016",

doi = "10.1126/science.aad8892",

language = "English",

volume = "352",

pages = "73--76",

journal = "Science",

issn = "0036-8075",

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TY - JOUR

T1 - Tuning the activity of Pt alloy electrocatalysts by means of the lanthanide contraction

AU - Escribano, Maria Escudero

AU - Malacrida, Paolo

AU - Hansen, Martin Hangaard

AU - Vej-Hansen, Ulrik Grønbjerg

AU - Velazquez-Palenzuela, Amado Andres

AU - Tripkovic, Vladimir

AU - Schiøtz, Jakob

AU - Rossmeisl, Jan

AU - Stephens, Ifan E. L.

AU - Chorkendorff, Ib

PY - 2016

Y1 - 2016

N2 - 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.

AB - 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.

KW - Reports

KW - CHEMISTRY

U2 - 10.1126/science.aad8892

DO - 10.1126/science.aad8892

M3 - Journal article

C2 - 27034369

SN - 0036-8075

VL - 352

SP - 73

EP - 76

JO - Science

JF - Science

IS - 6281

ER -

Tuning the activity of Pt alloy electrocatalysts by means of the lanthanide contraction

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