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

被引：881

作者：

Escudero-Escribano, Maria ^{[1
,2
]}

Malacrida, Paolo ^{[1
]}

Hansen, Martin H. ^{[3
,4
]}

Vej-Hansen, Ulrik G. ^{[1
,3
]}

Velazquez-Palenzuela, Amado ^{[1
]}

Tripkovic, Vladimir ^{[3
,5
]}

Schiotz, Jakob ^{[1
,3
]}

Rossmeisl, Jan ^{[3
,4
]}

Stephens, Ifan E. L. ^{[1
,6
]}

Chorkendorff, Ib ^{[1
]}

机构：

[1] Tech Univ Denmark, Dept Phys, CINF, DK-2800 Lyngby, Denmark

[2] Stanford Univ, Dept Chem Engn, Stanford, CA 94305 USA

[3] Tech Univ Denmark, Dept Phys, Ctr Atom Scale Mat Design CAMD, DK-2800 Lyngby, Denmark

[4] Univ Copenhagen, Dept Chem, Nanosci Ctr, DK-2100 Copenhagen, Denmark

[5] Tech Univ Denmark, Dept Energy Convers & Storage, DK-4000 Roskilde, Denmark

[6] MIT, Dept Mech Engn, Cambridge, MA 02139 USA

来源：

SCIENCE | 2016年 / 352卷 / 6281期

基金：

新加坡国家研究基金会;

关键词：

OXYGEN REDUCTION; CATALYSTS; PLATINUM; ENERGY; STRAIN;

D O I：

10.1126/science.aad8892

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页码：73 / 76

页数：4

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