Imaging Heterogeneous Electrocatalyst Stability and Decoupling Degradation Mechanisms in Operating Hydrogen Fuel Cells,ACS Energy Letters

当前位置： X-MOL 学术 › ACS Energy Lett. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Imaging Heterogeneous Electrocatalyst Stability and Decoupling Degradation Mechanisms in Operating Hydrogen Fuel Cells
ACS Energy Letters ( IF 19.3 ) Pub Date : 2021-07-15 , DOI: 10.1021/acsenergylett.1c00718
Isaac Martens _{1,

2} , Antonis Vamvakeros _{1,

3,

4} , Nicolas Martinez ₅ , Raphaël Chattot ₁ , Janne Pusa ₁ , Maria Valeria Blanco ₁ , Elizabeth A. Fisher ₂ , Tristan Asset ₆ , Sylvie Escribano ₅ , Fabrice Micoud ₅ , Tim Starr ₇ , Alan Coelho ₈ , Veijo Honkimäki ₁ , Dan Bizzotto ₂ , David P. Wilkinson ₉ , Simon D. M. Jacques ₄ , Frédéric Maillard ₆ , Laetitia Dubau ₆ , Sandrine Lyonnard ₁₀ , Arnaud Morin ₅ , Jakub Drnec ₁

Affiliation

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.

中文翻译：

运行氢燃料电池中的非均相电催化剂稳定性和解耦降解机制的成像

铂催化剂的降解阻碍了氢燃料电池系统的普及。在这里，我们使用为设备规模成像量身定制的先进操作 X 射线散射断层扫描，对催化剂降解现象及其与纳米级水化梯度的耦合进行了设备级评估。燃料电池内部形成的梯度会导致催化剂纳米结构的异质降解，这可能与电池中的流场设计和水分布有关。在运行的燃料电池设备和通常用于催化剂稳定性研究的液体电池之间观察到催化剂降解的显着差异，突出了复杂的运行环境对催化剂降解现象的关键影响。这种退化知识差距强调了多模式的必要性，

更新日期：2021-08-13

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南