Oxygen Reduction Reaction Activity and Durability for Model Pt Shell Layers on Ir(111) Prepared by Molecular Beam Epitaxy

被引：0

作者：

Watanabe, H. ^{[1
]}

Kaneko, S. ^{[1
]}

Todoroki, N. ^{[1
]}

Wadayama, T. ^{[1
]}

机构：

[1] Tohoku Univ, Grad Sch Environm Studies, Sendai, Miyagi 9808579, Japan

来源：

POLYMER ELECTROLYTE FUEL CELLS 16 (PEFC 16) | 2016年 / 75卷 / 14期

基金：

日本学术振兴会;

关键词：

ALLOY CATALYSTS; FUEL-CELLS; PLATINUM; ELECTROCATALYSTS; SURFACE; IRIDIUM;

D O I：

10.1149/07514.0815ecst

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

We fabricated well-defined Pt-Ir bimetallic surfaces through monolayer-thick Pt epitaxial growth on Ir(111) substrates (Pt-nML/Ir(111): n = 1-4) using molecular beam epitaxy in ultrahigh vacuum (UHV). The surface structures of Pt-nML/Ir(111) were verified using reflection high-energy electron diffraction in UHV. Electrochemical characterization tests, including evaluations of oxygen reduction reaction (ORR) activity and durability, were performed using cyclic voltammetry and rotating disk electrode techniques in 0.1 M HClO4. Regarding the initial ORR activity for Pt-nML/Ir(111) surfaces, Pt-2ML/Ir(111) surfaces exhibited the highest ORR activity (24 times that of the clean Pt(111) surfaces). Initial ORR activities declined when square-wave potential cycles (PCs) were applied between 0.6 and 1.0 V vs. reversible hydrogen electrode. The Pt-4ML/Ir(111) surface exhibited the highest ORR activity even after 5000 PC loadings (6 times that of the clean Pt(111) surfaces), suggesting that Pt-shell/Ir-core core-shell nanoparticles have potential for use as practical Pt-based bimetallic ORR catalysts.

引用

页码：815 / 820

页数：6

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