Positive Effect of Surface Doping with Au on the Stability of Pt-Based Electrocatalysts

被引：100

作者：

Gatalo, Matija ^{[1
,2
]}

Jovanovic, Primoz ^{[1
,2
]}

Polymeros, George ^{[4
]}

Grote, Jan-Philipp ^{[4
]}

Pavlisic, Andraz ^{[2
]}

Ruiz-Zepeda, Francisco ^{[2
]}

Selih, Vid Simon ^{[3
]}

Sala, Martin ^{[3
]}

Hocevar, Samo ^{[3
]}

Bele, Marjan ^{[2
]}

Mayrhofer, Karl J. J. ^{[4
,5
]}

Hodnik, Nejc ^{[2
,4
]}

Gaberscek, Miran ^{[1
,2
]}

机构：

[1] Univ Ljubljana, Fac Chem & Chem Technol, Vecna Pot 113, SI-1000 Ljubljana, Slovenia

[2] Natl Inst Chem, Lab Mat Chem, Hajdrihova 19, SI-1000 Ljubljana, Slovenia

[3] Natl Inst Chem, Analyt Chem Lab, Hajdrihova 19, SI-1000 Ljubljana, Slovenia

[4] Max Planck Inst Eisenforsch GmbH, Dept Interface Chem & Surface Engn, Max Planck Str 1, D-40237 Dusseldorf, Germany

[5] Forschungszentrum Julich, Helmholtz Inst Erlangen Nurnberg IEK11, Nagelsbachstr 49b, D-91052 Erlangen, Germany

来源：

ACS CATALYSIS | 2016年 / 6卷 / 03期

关键词：

platinum; alloy; electrocatalyst; corrosion; Au doping; OXYGEN REDUCTION REACTION; FUEL-CELL CATALYSTS; CORE-SHELL; ALLOY ELECTROCATALYSTS; PLATINUM DISSOLUTION; ENERGY-CONVERSION; NANOPARTICLES; ELECTROLYTE; MODELS; PAFC;

D O I：

10.1021/acscatal.5b02883

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Corrosion resistance of a transition-metal-rich PtCu3/C oxygen reduction reaction (ORR) catalyst as a representative of Pt alloy-based materials has been significantly improved by doping with small amounts of gold (<1 at. %). Transmission electron microscopy imaging shows near-surface segregation of both platinum and gold with the underlying core consisting predominantly of intermetallic PtCu3. The resulting PtAu skin catalyst shows improved resistance against Cu dissolution, as well as against carbon corrosion if compared to its PtCu3 precursor. Also, it exhibits a much higher Pt and carbon stability than a widely used Pt/C standard. Most importantly, the Au doped sample shows a substantial improvement in stability at the elevated temperature (60 degrees C) degradation test (10 000 cycles; 0.4-1.2 Vim) simulating a real PEM fuel cell environment.

引用

页码：1630 / 1634

页数：5

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