Abstract

Cation transport through nano-channels in graphene oxide can be rectified to give ionic diode devices for future applications for example in desalination. A film of graphene oxide is applied to a 6 m thick poly-ethylene-terephthalate (PET) substrate with 20 m diameter microhole and immersed in aqueous HCl solution. Strong diode effects are observed even at high ionic strength (0.5 M). Switching between open and closed states, microhole size effects, and time dependent phenomena are explained based on a simplified theoretical model focusing on the field-driven transport within the microhole region. In aqueous NaCl, competition between Na+ transport and field-driven heterolytic water splitting are observed, but shown to be significant only at low ionic strength. Therefore, nanostructured graphene oxide is demonstrated to exhibit close to ideal behavior for future application in ionic diode desalination of seawater.
Original languageEnglish
JournalLangmuir
Early online date14 Jan 2019
DOIs
Publication statusE-pub ahead of print - 14 Jan 2019

Cite this

A Cationic Rectifier Based on a Graphene Oxide Covered Microhole: Theory and Experiment. / Putra, Budi Riza; Aoki, Koichi Jeremiah; Chen, Jingyuan; Marken, Frank.

In: Langmuir , 14.01.2019.

Research output: Contribution to journalArticle

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