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Design of an In-Operando Cell for X-Ray and Neutron Imaging of Oxygen-Depolarized Cathodes in Chlor-Alkali Electrolysis

机译:氯碱电解中氧去极化阴极的X射线和中子成像操作腔内电池的设计

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摘要

Oxygen-depolarized cathodes are a novel concept to be used in chlor-alkali electrolysis in order to generate significant energy savings. In these porous gas diffusion electrodes, hydrophilic and catalytically active microsized silver grains and a hydrophobic polytetrafluoroethylene cobweb structure are combined to obtain the optimum amount of three-phase boundaries between the highly alkaline electrolyte and the oxygen gas phase to achieve high current densities. However, the direct correlation between specific electrode structure and electrochemical performance is difficult. In this work, we report on the successful design and adaptation of an in-operando cell for X-ray (micro-computed tomography, synchrotron) and neutron imaging of an operating oxygen-depolarized cathode under realistic operation conditions, enabling the investigation of the electrolyte invasion into, and distribution inside, the porous electrode for the first time.
机译:氧去极化阴极是一种新颖的概念,可用于氯碱电解,以节省大量能源。在这些多孔气体扩散电极中,将亲水和催化活性的微米级银颗粒和疏水的聚四氟乙烯蜘蛛网结构结合在一起,以获得高碱性电解质和氧气相之间最佳的三相边界量,以实现高电流密度。然而,特定电极结构和电化学性能之间的直接关联是困难的。在这项工作中,我们报告了在实际操作条件下对操作中的氧去极化阴极进行X射线(微型计算机断层扫描,同步加速器)和中子成像的操作腔内细胞的成功设计和适应性研究,从而能够对电解质第一次侵入多孔电极并在内部分布。

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