@article {34433,
	title = {Imaging Heterogeneous Electrocatalyst Stability and Decoupling Degradation Mechanisms in Operating Hydrogen Fuel Cells},
	journal = {ACS Energy Letters},
	volume = {6},
	year = {2021},
	pages = {2742{\textendash}2749},
	abstract = {<p>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.</p>},
	issn = {2380-8195},
	doi = {10.1021/acsenergylett.1c00718},
	url = {https://pubs.acs.org/doi/10.1021/acsenergylett.1c00718},
	author = {Martens, Isaac and Vamvakeros, Antonis and Martinez, Nicolas and Chattot, Rapha{\"e}l and Pusa, Janne and Blanco, Maria Valeria and Fisher, Elizabeth A. and Asset, Tristan and Escribano, Sylvie and Micoud, Fabrice and Starr, Tim and Coelho, Alan and Honkim{\"a}ki, Veijo and Bizzotto, Dan and Wilkinson, David P. and Jacques, Simon D. M. and Maillard, Fr{\'e}d{\'e}ric and Dubau, Laetitia and Lyonnard, Sandrine and Morin, Arnaud and Drnec, Jakub}
}
