Mapping Charge Percolation in Flowable Electrodes Used in Capacitive Deionization
Mapping Charge Percolation in Flowable Electrodes Used in Capacitive Deionization
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DOI：
10.1021/acsmaterialslett.9b00106
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发表时间：
2019-07-01
影响因子：
11.4
通讯作者：
Hatzell, Kelsey B.
中科院分区：
文献类型：
--
作者：
Dixit, Marm B.;Moreno, Daniel;Hatzell, Kelsey B.
流动电极电容去离子过程中的电渗透是降低电阻和最大化离子电吸附的关键。从空间和时间维度来表征流动电极中的质量和电荷转移现象是一项具有挑战性的实验。在这里，我们展示了一种在亚微米分辨率下使用同步加速器x射线断层扫描和计算技术来解决电荷渗透途径的方法。三维重建图像提供了一种测量重要的微尺度和中尺度电极性质的手段，如孔隙大小分布、聚集大小和渗透性质。发展对流动电极的微观结构的理解对于了解输送限制如何影响分离性能以及在技术层面（流动状态）告知操作条件是必要的。
Electrical percolation in flow electrode capacitive deionization is critical to mitigate electronic resistance and maximize ion electrosorption. It is experimentally challenging to characterize mass and charge transfer phenomena in flow electrodes with space and time dimensions. Here, we demonstrate a way to resolve charge percolation pathways at sub-micron resolutions using synchrotron X-ray tomography and computational techniques. Three-dimensional reconstructed images provide a means to measure important micro- and mesoscale electrode properties, such as pore-size distribution, aggregation size, and percolation properties. Developing this microstructural understanding of flow-electrodes is necessary to understand how transport limitations impact separations performance and to inform operating conditions at the technology level (flow regimes).