Synchrotron x-ray imaging techniques, like x-ray computed tomography (CT) and radiography have proven instrumental in expanding the communities knowledge of complex transport and reaction kinetics in electrochemical devices such as fuel cells and electrolyzers. This work presents the development of novel x-ray CT imaging techniques for operando visualization of water within low temperature fuel cells at spatial resolutions spanning the micro and nano scales. The design of operando sample holders, for both micro x-ray CT and nano CT experiments is described in depth, and prototypes of these sample holders were evaluated across a set of requirements, the most important of which are x-ray transmissibility, electrical conductivity and mechanical stability. Water segmentation from micro x-ray CT data was enabled by an image subtraction method, where the image without water is subtracted from the one with water. Through iterative experimentations, the operando nan...

中文翻译：

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用于Operando X射线和纳米计算机断层扫描的低温燃料电池支架的开发，以可视化水的分布

同步加速器X射线成像技术（如X射线计算机断层扫描（CT）和射线照相）已被证明有助于扩大社区对燃料电池和电解器等电化学装置中复杂的运输和反应动力学的认识。这项工作提出了新颖的X射线CT成像技术的发展，用于以可视化方式跨越微米和纳米尺度的空间分辨率可视化低温燃料电池中的水。深入描述了用于显微X射线CT和纳米CT实验的操作样品架的设计，并根据一系列要求对这些样品架的原型进行了评估，其中最重要的是X射线透射率，电导率和机械稳定性。通过图像减影方法可以从微X射线CT数据中进行水分割，从没有水的图像中减去有水的图像。通过反复的实验，操作人员可以轻松地进行操作。