Unprecedented dependence of the oxygen reduction activity on Co content at Pt Skin/Pt-Co(111) single crystal electrodes

被引：19

作者：

Wakisaka, M. ^{[1
]}

Kobayashi, S. ^{[2
]}

Morishima, S. ^{[2
]}

Hyuga, Y. ^{[2
]}

Tryk, D. A. ^{[1
]}

Watanabe, M. ^{[1
]}

Iiyama, A. ^{[1
]}

Uchida, H. ^{[1
,3
]}

机构：

[1] Univ Yamanashi, Fuel Cell Nanomat Ctr, 6-43 Miyamae, Kofu, Yamanashi 4000021, Japan

[2] Univ Yamanashi, Interdisciplinary Grad Sch Med & Engn, 4 Takeda, Kofu, Yamanashi 4008510, Japan

[3] Univ Yamanashi, Clean Energy Res Ctr, 4 Takeda, Kofu, Yamanashi 4008510, Japan

来源：

ELECTROCHEMISTRY COMMUNICATIONS | 2016年 / 67卷

关键词：

Pt-Co alloy; Single-crystal; Pt-skin layer; Oxygen reduction reaction; Rotating disk electrode; PT-CO; ELECTROCATALYSIS; FE; ALLOYS; ELECTROREDUCTION; BEHAVIOR; NI;

D O I：

10.1016/j.elecom.2016.03.015

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The kinetically controlled area-specific activities, j(k), for the oxygen reduction reaction (ORR) were evaluated at well-defined Pt-skin/Pt100-xCox(111) single crystal electrodes as a function of Co content by use of the rotating disk electrode method. The Pt-skin layer formed by annealing under a pure H-2 atmosphere was clarified to consist of atomically flat terraces with the same atomic arrangement as the underlying crystal. At 25 atom%-Co, the j(k) value reached a maximum as high as 3.0 mA cm(-2) at 0.9 V vs. RHE, which is ca. 25 times larger than that on pure Pt(111). Such an enhanced ORR activity of Pt-skin/Pt-Co(111) electrodes cannot be explained on the basis of decreased OH poisoning, because the surface oxidation charge densities measured at 0.9 V in N-2-purged solution were nearly constant. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：47 / 50

页数：4

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