High-Performance Capacitive Deionization via Manganese Oxide-Coated, Vertically Aligned Carbon Nanotubes
Abstract
Discovering electrode materials with exceptional capacitance, an indicator of the ability of a material to hold charge, is critical for developing capacitive deionization devices for water desalination. Maganese oxides (MnOx) have shown promise as capacitive electrode materials, but they exhibit a tradeoff where higher loading of the active MnOx comes at a cost of lower conductivity. To address this challenge and achieve high salt adsorption, we fabricated electrodes comprising vertically aligned core-shell nanostructures using atomic layer deposition (ALD) to coat thin films of MnOx onto vertically aligned carbon nanotubes (VACNTs). The inherently hierarchical, anisotropic, three-dimensional macroporous structure of VACNTs and the tunable coating, a hallmark of ALD, enabled co-optimization of the hybrid material’s specific capacitance with respect to mass and geometric area. The specific capacitance was optimized in this study to 215 ± 7 F/g and 1.1 ± 0.1 F/cm2 in 1 M NaCl electrolyte at 5 mV/s scan rate, respectively. This material exhibited remarkable sodium ion adsorption capacity of 489 ± 25 μmol Na /g material (two-fold higher than pristine VACNTs) at a functioning voltage of 1.2 V, which may ultimately enable expanded desalination applications of capacitive deionization.
- Authors:
-
[4];
[6];
[2];
[2];
[1]
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Civil and Environmental Engineering, Massachusetts Institute of Technology; Yale Univ., New Haven, CT (United States). Dept. of Chemical and Environmental Engineering
- Yale Univ., New Haven, CT (United States). Dept. of Chemical and Environmental Engineering, and Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment (NEWT)
- Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, P. R. China
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Physical and Life Sciences Directorate
- Yale Univ., New Haven, CT (United States). Dept. of Chemical and Environmental Engineering; New York Univ. (NYU), NY (United States). Dept. of Chemical and Biomolecular Engineering
- Yale Univ., New Haven, CT (United States). Dept. of Chemical and Environmental Engineering, and Energy Sciences Inst.
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1560981
- Report Number(s):
- LLNL-JRNL-755914
Journal ID: ISSN 2328-8930; 943204
- Grant/Contract Number:
- AC52-07NA27344
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Environmental Science & Technology Letters (Online)
- Additional Journal Information:
- Journal Name: Environmental Science & Technology Letters (Online); Journal Volume: 5; Journal Issue: 11; Journal ID: ISSN 2328-8930
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 77 NANOSCIENCE AND NANOTECHNOLOGY
Citation Formats
Shi, Wenbo, Zhou, Xuechen, Li, Jinyang, Meshot, Eric R., Taylor, André D., Hu, Shu, Kim, Jae-Hong, Elimelech, Menachem, and Plata, Desiree L. High-Performance Capacitive Deionization via Manganese Oxide-Coated, Vertically Aligned Carbon Nanotubes. United States: N. p., 2018.
Web. doi:10.1021/acs.estlett.8b00397.
Shi, Wenbo, Zhou, Xuechen, Li, Jinyang, Meshot, Eric R., Taylor, André D., Hu, Shu, Kim, Jae-Hong, Elimelech, Menachem, & Plata, Desiree L. High-Performance Capacitive Deionization via Manganese Oxide-Coated, Vertically Aligned Carbon Nanotubes. United States. https://doi.org/10.1021/acs.estlett.8b00397
Shi, Wenbo, Zhou, Xuechen, Li, Jinyang, Meshot, Eric R., Taylor, André D., Hu, Shu, Kim, Jae-Hong, Elimelech, Menachem, and Plata, Desiree L. Fri .
"High-Performance Capacitive Deionization via Manganese Oxide-Coated, Vertically Aligned Carbon Nanotubes". United States. https://doi.org/10.1021/acs.estlett.8b00397. https://www.osti.gov/servlets/purl/1560981.
@article{osti_1560981,
title = {High-Performance Capacitive Deionization via Manganese Oxide-Coated, Vertically Aligned Carbon Nanotubes},
author = {Shi, Wenbo and Zhou, Xuechen and Li, Jinyang and Meshot, Eric R. and Taylor, André D. and Hu, Shu and Kim, Jae-Hong and Elimelech, Menachem and Plata, Desiree L.},
abstractNote = {Discovering electrode materials with exceptional capacitance, an indicator of the ability of a material to hold charge, is critical for developing capacitive deionization devices for water desalination. Maganese oxides (MnOx) have shown promise as capacitive electrode materials, but they exhibit a tradeoff where higher loading of the active MnOx comes at a cost of lower conductivity. To address this challenge and achieve high salt adsorption, we fabricated electrodes comprising vertically aligned core-shell nanostructures using atomic layer deposition (ALD) to coat thin films of MnOx onto vertically aligned carbon nanotubes (VACNTs). The inherently hierarchical, anisotropic, three-dimensional macroporous structure of VACNTs and the tunable coating, a hallmark of ALD, enabled co-optimization of the hybrid material’s specific capacitance with respect to mass and geometric area. The specific capacitance was optimized in this study to 215 ± 7 F/g and 1.1 ± 0.1 F/cm2 in 1 M NaCl electrolyte at 5 mV/s scan rate, respectively. This material exhibited remarkable sodium ion adsorption capacity of 489 ± 25 μmol Na /g material (two-fold higher than pristine VACNTs) at a functioning voltage of 1.2 V, which may ultimately enable expanded desalination applications of capacitive deionization.},
doi = {10.1021/acs.estlett.8b00397},
journal = {Environmental Science & Technology Letters (Online)},
number = 11,
volume = 5,
place = {United States},
year = {Fri Oct 05 00:00:00 EDT 2018},
month = {Fri Oct 05 00:00:00 EDT 2018}
}
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Figures / Tables:
Figure 1: Vertically aligned coaxial CNT-MnOx hybrid synthesis and characterization. (a) Schematic illustration of MnOx coating strategy on VACNTs via ALD and proposed model of electrosorption of ions on the coated VACNTs. (b) Cross-sectional SEM image demonstrating the alignment of pristine VACNTs. (c) Increase in VACNT diameter after 150 ALDmore »
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