Mapping Charge Percolation in Flowable Electrodes Used in Capacitive Deionization

Marm B. Dixit; Daniel Moreno; Xianghui Xiao; Marta C. Hatzell; Kelsey B. Hatzell

doi:10.1021/acsmaterialslett.9b00106

Mapping Charge Percolation in Flowable Electrodes Used in Capacitive Deionization

Marm B. Dixit, Daniel Moreno, Xianghui Xiao, Marta C. Hatzell, Kelsey B. Hatzell

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

Abstract

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).

Original language	English
Pages (from-to)	71-76
Number of pages	6
Journal	ACS Materials Letters
Volume	1
Issue number	1
DOIs	https://doi.org/10.1021/acsmaterialslett.9b00106
State	Published - Jul 1 2019
Externally published	Yes

Funding

This material is based upon work supported by the National Science Foundation under Grant No. 1706290 for M.C.H. and Grant No. 1706956 for K.B.H. The authors acknowledge the Vanderbilt Institute of Nanoscience and Engineering (VINSE) for access to their shared characterization facilities. This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. This research used resources of the National Synchrotron Light Source II, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Brookhaven National Laboratory under Contract No. DE-SC0012704.

Funders	Funder number
National Science Foundation	1706290, 1706956
U.S. Department of Energy
Office of Science
Argonne National Laboratory	DE-AC02-06CH11357
Brookhaven National Laboratory	DE-SC0012704

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10.1021/acsmaterialslett.9b00106

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title = "Mapping Charge Percolation in Flowable Electrodes Used in Capacitive Deionization",

abstract = "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).",

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AU - Hatzell, Kelsey B.

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AB - 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).

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Mapping Charge Percolation in Flowable Electrodes Used in Capacitive Deionization

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