High-Performance Capacitive Deionization via Manganese Oxide-Coated, Vertically Aligned Carbon Nanotubes

Wenbo Shi, Xuechen Zhou, Jinyang Li, Eric R. Meshot, Andre Taylor, Shu Hu, Jae Hong Kim, Menachem Elimelech, Desiree L. Plata

Research output: Contribution to journalArticle

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 trade-off in which a higher loading of the active MnOx comes at the 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 a 1 M NaCl electrolyte at a scan rate of 5 mV/s. This material exhibited a remarkable sodium ion adsorption capacity of 490 ± 30 μmol of Na/g of material (2-fold higher than that of pristine VACNTs) at a functioning voltage of 1.2 V, which may ultimately enable expanded desalination applications of capacitive deionization.

Original languageEnglish (US)
Pages (from-to)692-700
Number of pages9
JournalEnvironmental Science and Technology Letters
Volume5
Issue number11
DOIs
StatePublished - Nov 13 2018

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Carbon Nanotubes
Manganese oxide
manganese oxide
Oxides
Carbon nanotubes
Electrodes
Adsorption
Capacitance
Atomic layer deposition
Desalination
electrode
Nanostructures
oxide
Electrolytes
Salts
Sodium
Ions
Hybrid materials
adsorption
Equipment and Supplies

ASJC Scopus subject areas

  • Ecology
  • Environmental Chemistry
  • Health, Toxicology and Mutagenesis
  • Pollution
  • Waste Management and Disposal
  • Water Science and Technology

Cite this

High-Performance Capacitive Deionization via Manganese Oxide-Coated, Vertically Aligned Carbon Nanotubes. / Shi, Wenbo; Zhou, Xuechen; Li, Jinyang; Meshot, Eric R.; Taylor, Andre; Hu, Shu; Kim, Jae Hong; Elimelech, Menachem; Plata, Desiree L.

In: Environmental Science and Technology Letters, Vol. 5, No. 11, 13.11.2018, p. 692-700.

Research output: Contribution to journalArticle

Shi, W, Zhou, X, Li, J, Meshot, ER, Taylor, A, Hu, S, Kim, JH, Elimelech, M & Plata, DL 2018, 'High-Performance Capacitive Deionization via Manganese Oxide-Coated, Vertically Aligned Carbon Nanotubes', Environmental Science and Technology Letters, vol. 5, no. 11, pp. 692-700. https://doi.org/10.1021/acs.estlett.8b00397
Shi, Wenbo ; Zhou, Xuechen ; Li, Jinyang ; Meshot, Eric R. ; Taylor, Andre ; Hu, Shu ; Kim, Jae Hong ; Elimelech, Menachem ; Plata, Desiree L. / High-Performance Capacitive Deionization via Manganese Oxide-Coated, Vertically Aligned Carbon Nanotubes. In: Environmental Science and Technology Letters. 2018 ; Vol. 5, No. 11. pp. 692-700.
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