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

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

doi:10.1021/acs.estlett.8b00397

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

Journal Article · 05 October 2018 · Environmental Science & Technology Letters (Online)

DOI: https://doi.org/10.1021/acs.estlett.8b00397 · OSTI ID:1560981

Shi, Wenbo ^[1]; Zhou, Xuechen ^[2]; Li, Jinyang ^[3];

^[4]; Taylor, André D. ^[5];

^[6];

^[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.

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.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1560981

Report Number(s):: LLNL-JRNL-755914; 943204

Journal Information:: Environmental Science & Technology Letters (Online), Vol. 5, Issue 11; ISSN 2328-8930

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 64 works

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