Decomposition of Pt-Ru anode catalysts in direct methanol fuel cells

被引：43

作者：

Park, Gyeong-Su ^{[1
]}

Pak, Chanho ^{[2
]}

Chung, Young-Su ^{[1
]}

Kim, Ji-Rae ^{[2
]}

Jeon, Woo Sung ^{[1
]}

Lee, Yoon-Hoi ^{[2
]}

Kim, Kihong ^{[1
]}

Chang, Hyuk ^{[2
]}

Seung, Doyoung ^{[1
,2
]}

机构：

[1] Samsung Adv Inst Technol, Analyt Engn Ctr, Suwon 440600, South Korea

[2] Samsung Adv Inst Technol, Energy & Mat Res Lab, Suwon 440600, South Korea

来源：

JOURNAL OF POWER SOURCES | 2008年 / 176卷 / 02期

关键词：

direct methanol fuel cell; Pt-Ru anode catalysts; Ru and Pt crossover; membrane electrode assembly; performance drop;

D O I：

10.1016/j.jpowsour.2007.08.068

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：

The durability behavior of Pt-Ru anode catalysts under virtual direct methanol fuel cell (DMFC) operating conditions was investigated in the atomic scale using both high-resolution transmission electron microscopy (HR-TEM) and time-of-flight secondary ion mass spectroscopy (TOF-SIMS). We find here the crossover of ruthenium and platinum from the anode to the cathode due to the decomposition of active Pt-Ru anode catalysts. The Ru crossover measured at the cathode increases linearly with performance drop. The Ru contents determined by X-ray photoelectron spectroscopy (XPS) are less than 0.3 atom%. The platinum, newly deposited at the cathode with high performance drop, is formed with the intermixture of defective nanocrystalline (similar to 3 nm) and amorphous structure. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：484 / 489

页数：6

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