Layered manganese oxides as electrodes for water desalination via hybrid capacitive deionization

Bryan W. Byles; Brendan Hayes-Oberst; Ekaterina Pomerantseva

doi:10.1117/12.2321136

11 September 2018 Layered manganese oxides as electrodes for water desalination via hybrid capacitive deionization

Bryan W. Byles, Brendan Hayes-Oberst, Ekaterina Pomerantseva

Proceedings Volume 10725, Low-Dimensional Materials and Devices 2018; 1072513 (2018) https://doi.org/10.1117/12.2321136
Event: SPIE Nanoscience + Engineering, 2018, San Diego, California, United States

Abstract

This work explores the ion removal performance of Na-birnessite and Mg-buserite during extended cycling in NaCl and MgCl₂ solutions in a hybrid capacitive deionization (HCDI) cell. These two layered manganese oxides (LMOs) contain two-dimensional diffusion pathways and thus present the potential for enhanced ion diffusion and higher performance in HCDI. Correlation between stabilizing ions and ions removed from solution are investigated. In NaCl solution, Mgbuserite shows the largest ion removal capacity of 37.2 mg g^-1 while the reverse is true in MgCl₂ solution, where Nabirnessite delivers a capacity of 50.2 mg g^-1. Furthermore, ex-situ XRD after 200 cycles revealed the changes in the structures of the two materials after repeated ion removal-ion release. These results demonstrate that materials with twodimensional crystal structures can demonstrate high capacities in HCDI and show that interlayer content and spacing can dramatically impact material stability in electrochemical water desalination.

Citation Download Citation

Bryan W. Byles, Brendan Hayes-Oberst, and Ekaterina Pomerantseva "Layered manganese oxides as electrodes for water desalination via hybrid capacitive deionization", Proc. SPIE 10725, Low-Dimensional Materials and Devices 2018, 1072513 (11 September 2018); https://doi.org/10.1117/12.2321136

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