Investigation of the three-dimensional ruthenium distribution in fresh and aged membrane electrode assemblies with synchrotron X-ray absorption edge tomography

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• 作者：Tobias Arlt^a ; ^{tobias.arlt@helmholtz-berlin.de"" rel=""nofollow} ; Ingo Manke^a ; Klaus Wippermann^b ; Christian Tö ; tzke^a ; Henning Markö ; tter^a ; Heinrich Riesemeier^c ; Jü ; rgen Mergel^b ; John Banhart^a
• 关键词：Edge tomography ; Ruthenium distribution ; Direct methanol fuel cells ; Synchrotron X-ray ; PtRu corrosion
• 刊名：Electrochemistry Communications
• 出版年：2011
• 出版时间：August 2011
• 年：2011
• 卷：13
• 期：8
• 页码：826-829
• 全文大小：853 K

文摘

Synchrotron X-ray absorption edge imaging was used to investigate the ruthenium distribution in both fresh and aged Pt/Ru-based membrane electrode assemblies (MEA) of direct methanol fuel cells. MEAs aged in different ways were analyzed: artificially aged by MeOH depletion and aged for 1700 h in an operating fuel cell stack. An element sensitive tomographic technique – differential X-ray absorption edge tomography – was applied allowing for a 3D-visualization of the ruthenium distribution within the MEA. We found a markedly changed Ru distribution after aging which is correlated to the GDL structure, the flow field geometry, and CO2 transport in the methanol solution.