Comparison of Pt-Cu/C with Benchmark Pt-Co/C: Metal Dissolution and Their Surface Interactions

被引：63

作者：

Gatalo, Matija ^{[1
,2
]}

Jovanovic, Primoz ^{[3
]}

Petek, Ursa ^{[1
]}

Sala, Martin ^{[4
]}

Selih, Vid Simon ^{[4
]}

Ruiz-Zepeda, Francisco ^{[1
]}

Bele, Marjan ^{[1
]}

Hodnik, Nejc ^{[3
]}

Gaberscek, Miran ^{[1
,2
]}

机构：

[1] Natl Inst Chem, Dept Mat Chem, Hajdrihova 19, Ljubljana 1000, Slovenia

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

[3] Natl Inst Chem, Dept Catalysis & Chem React Engn, Hajdrihova 19, Ljubljana 1000, Slovenia

[4] Natl Inst Chem, Dept Analyt Chem, Hajdrihova 19, Ljubljana 1000, Slovenia

来源：

ACS APPLIED ENERGY MATERIALS | 2019年 / 2卷 / 05期

关键词：

oxygen reduction reaction; proton exchange membrane fuel cell; platinum alloy; metal dissolution; electrochemical flow cell coupled to inductively coupled plasma mass spectrometer; OXYGEN REDUCTION REACTION; CORE-SHELL; UNDERPOTENTIAL DEPOSITION; PLATINUM DISSOLUTION; MODEL EXPERIMENTS; PARTICLE-SIZE; ELECTROCATALYSTS; NANOPARTICLES; CATALYSTS; ALLOY;

D O I：

10.1021/acsaem.8b02142

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：

Understanding of less-noble-metal (M) dissolution from Pt-alloy-based oxygen reduction reaction (ORR) electrocatalysts, as well its interaction with Pt surface, is crucial for maximizing their performance. In pursuing this goal, two ORR electrocatalysts-a benchmark Pt-Co/C and an in-house designed Pt-Cu/C materials-are investigated. Both are characterized with a range of standard techniques, such as X-ray diffraction (XRD), transmission electron microscopy (TEM) combined with energy dispersive spectroscopy (EDX) and thin film-rotating disc electrode (TF-RDE) measurements. A special focus is put on combining the latter with a highly sensitive electrochemical flow cell (EFC) online connected to inductively coupled plasma mass spectrometry (ICP-MS) measurements. A combination of standard and novel techniques provides unprecedented insights into the dissolution behavior and dynamics of metals, as well as their subsequent surface interactions and effects on the electrochemical performance. A special focus is devoted to the significance of electrocatalyst activation protocols and their effects on metal dissolution. Distinct differences in the behavior of Pt-Cu and Pt-Co alloys are revealed, which will help develop proper protocols for practical implementation of Pt-alloy electrocatalysts.

引用

页码：3131 / 3141

页数：21

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