Abstract

We demonstrate that ionic current rectification effects are observed with a film of negatively charged carbon nanofibers (CNFs) deposited as a film or mat onto a 10 µm diameter microhole in poly-ethylene-terephthalate (PET). CNFs are synthesized via a chemical vapor deposition (CVD) method, followed by oxidation with hydrogen peroxide to introduce carboxyl moieties (providing negative surface charges). Carbon nanofibers are characterized with transmission electron microscopy (TEM), scanning electron microscopy (SEM), elemental analysis, and by zeta potential measurements. When drop-dried asymmetrically onto a 10 µm diameter cylindrical channel on a 6 m thick PET substrate and placed as membrane between two electrolyte compartments, ionic current rectification is observed. Effects of pH, ionic strength, and nature of electrolyte are investigated. Bipolar reactivity of iodide is demonstrated. Potential for future applications in water purification is discussed.
LanguageEnglish
JournalChemElectroChem
Early online date30 May 2019
DOIs
StatusE-pub ahead of print - 30 May 2019

Cite this

Carbon Nanofibers Provide a Cationic Rectifier Material: Specific Electrolyte Effects, Bipolar Reactivity, and Prospect for Desalination. / Marken, Frank; Tshwenya, Luthando; Arotiba, Omotayo.

In: ChemElectroChem, 30.05.2019.

Research output: Contribution to journalArticle

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abstract = "We demonstrate that ionic current rectification effects are observed with a film of negatively charged carbon nanofibers (CNFs) deposited as a film or mat onto a 10 µm diameter microhole in poly-ethylene-terephthalate (PET). CNFs are synthesized via a chemical vapor deposition (CVD) method, followed by oxidation with hydrogen peroxide to introduce carboxyl moieties (providing negative surface charges). Carbon nanofibers are characterized with transmission electron microscopy (TEM), scanning electron microscopy (SEM), elemental analysis, and by zeta potential measurements. When drop-dried asymmetrically onto a 10 µm diameter cylindrical channel on a 6 m thick PET substrate and placed as membrane between two electrolyte compartments, ionic current rectification is observed. Effects of pH, ionic strength, and nature of electrolyte are investigated. Bipolar reactivity of iodide is demonstrated. Potential for future applications in water purification is discussed.",
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AB - We demonstrate that ionic current rectification effects are observed with a film of negatively charged carbon nanofibers (CNFs) deposited as a film or mat onto a 10 µm diameter microhole in poly-ethylene-terephthalate (PET). CNFs are synthesized via a chemical vapor deposition (CVD) method, followed by oxidation with hydrogen peroxide to introduce carboxyl moieties (providing negative surface charges). Carbon nanofibers are characterized with transmission electron microscopy (TEM), scanning electron microscopy (SEM), elemental analysis, and by zeta potential measurements. When drop-dried asymmetrically onto a 10 µm diameter cylindrical channel on a 6 m thick PET substrate and placed as membrane between two electrolyte compartments, ionic current rectification is observed. Effects of pH, ionic strength, and nature of electrolyte are investigated. Bipolar reactivity of iodide is demonstrated. Potential for future applications in water purification is discussed.

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