Abstract

Cationic diodes based on Nafion ionomer coated microhole array substrates are combined with an anion conducting membrane to give an AC-electricity driven desalination or salination system. The combination of cationic diode with anionic resistor allows a 3D-printed four-chamber system to be configured with two internal chambers to extract and/or accumulate salt. Three configurations are demonstrated combining desalination and salination for an aqueous 250 mM NaCl solution. For a proof-of-concept device, 50% desalination/salination is demonstrated. The charge efficiency is estimated to be only 12%, limited mainly due to (i) resistivity lowering rectification, (ii) rectification ratio limitations for the array of microholes, (iii) insufficient stability of ionomer membranes under AC-pulse-driven operation. Perspectives for improvements and for future desalination/salination applications are given.
Original languageEnglish
JournalDesalination
Publication statusAccepted/In press - 27 Jan 2020

Cite this

An AC-Driven Desalination/Salination System Based on a Nafion Cationic Rectifier. / Marken, Frank; Putra, Budi Riza Putra; Madrid, Elena; Arotiba, Omotayo; Tshwenya, Luthando.

In: Desalination, 27.01.2020.

Research output: Contribution to journalArticle

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title = "An AC-Driven Desalination/Salination System Based on a Nafion Cationic Rectifier",
abstract = "Cationic diodes based on Nafion ionomer coated microhole array substrates are combined with an anion conducting membrane to give an AC-electricity driven desalination or salination system. The combination of cationic diode with anionic resistor allows a 3D-printed four-chamber system to be configured with two internal chambers to extract and/or accumulate salt. Three configurations are demonstrated combining desalination and salination for an aqueous 250 mM NaCl solution. For a proof-of-concept device, 50{\%} desalination/salination is demonstrated. The charge efficiency is estimated to be only 12{\%}, limited mainly due to (i) resistivity lowering rectification, (ii) rectification ratio limitations for the array of microholes, (iii) insufficient stability of ionomer membranes under AC-pulse-driven operation. Perspectives for improvements and for future desalination/salination applications are given.",
author = "Frank Marken and Putra, {Budi Riza Putra} and Elena Madrid and Omotayo Arotiba and Luthando Tshwenya",
year = "2020",
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T1 - An AC-Driven Desalination/Salination System Based on a Nafion Cationic Rectifier

AU - Marken, Frank

AU - Putra, Budi Riza Putra

AU - Madrid, Elena

AU - Arotiba, Omotayo

AU - Tshwenya, Luthando

PY - 2020/1/27

Y1 - 2020/1/27

N2 - Cationic diodes based on Nafion ionomer coated microhole array substrates are combined with an anion conducting membrane to give an AC-electricity driven desalination or salination system. The combination of cationic diode with anionic resistor allows a 3D-printed four-chamber system to be configured with two internal chambers to extract and/or accumulate salt. Three configurations are demonstrated combining desalination and salination for an aqueous 250 mM NaCl solution. For a proof-of-concept device, 50% desalination/salination is demonstrated. The charge efficiency is estimated to be only 12%, limited mainly due to (i) resistivity lowering rectification, (ii) rectification ratio limitations for the array of microholes, (iii) insufficient stability of ionomer membranes under AC-pulse-driven operation. Perspectives for improvements and for future desalination/salination applications are given.

AB - Cationic diodes based on Nafion ionomer coated microhole array substrates are combined with an anion conducting membrane to give an AC-electricity driven desalination or salination system. The combination of cationic diode with anionic resistor allows a 3D-printed four-chamber system to be configured with two internal chambers to extract and/or accumulate salt. Three configurations are demonstrated combining desalination and salination for an aqueous 250 mM NaCl solution. For a proof-of-concept device, 50% desalination/salination is demonstrated. The charge efficiency is estimated to be only 12%, limited mainly due to (i) resistivity lowering rectification, (ii) rectification ratio limitations for the array of microholes, (iii) insufficient stability of ionomer membranes under AC-pulse-driven operation. Perspectives for improvements and for future desalination/salination applications are given.

M3 - Article

JO - Desalination

JF - Desalination

SN - 0011-9164

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