Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1285839 | Journal of Power Sources | 2008 | 6 Pages |
Abstract
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 0.3Â atom%. The platinum, newly deposited at the cathode with high performance drop, is formed with the intermixture of defective nanocrystalline (â¼3Â nm) and amorphous structure.
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Authors
Gyeong-Su Park, Chanho Pak, Young-Su Chung, Ji-Rae Kim, Woo Sung Jeon, Yoon-Hoi Lee, Kihong Kim, Hyuk Chang, Doyoung Seung,