Isaac Martens, Antonis Vamvakeros, Nicolas Martinez, Raphaël Chattot, Janne Pusa, Maria Valeria Blanco, Elizabeth A. Fisher, Tristan Asset, Sylvie Escribano, Fabrice Micoud, Tim Starr, Alan Coelho, Veijo Honkimäki, Dan Bizzotto, David P. Wilkinson, Simon D. M. Jacques, Frédéric Maillard, Laetitia Dubau, Sandrine Lyonnard, Arnaud Morin, and Jakub Drnec
ACS Energy Lett., 6, 8(2021), 2742–2749
Publication year: 2021

The proliferation of hydrogen fuel cell systems is hindered by a degradation of the platinum catalyst. Here, we provide a device-level assessment of the catalyst degradation phenomena and its coupling to nanoscale hydration gradients, using advanced operando X-ray scattering tomography tailored for device-scale imaging. Gradients formed inside the fuel cell produce a heterogeneous degradation of the catalyst nanostructure, which can be linked to the flow field design and water distribution in the cell. Striking differences in catalyst degradation are observed between operating fuel cell devices and the liquid cell routinely used for catalyst stability studies, highlighting the crucial impact of the complex operating environment on the catalyst degradation phenomena. This degradation knowledge gap accentuates the necessity of multimodal, in situ characterization of real devices when assessing the performance and durability of electrocatalysts and, more generally, electrochemically active phases used in energy conversion and storage technologies.

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