Alkaline anion exchange membranes based on KOH-treated multilayer graphene oxide

Thomas Bayer, Benjamin V. Cunning, Roman Selyanchyn, Takeshi Daio, Masamichi Nishihara, Shigenori Fujikawa, Kazunari Sasaki, Stephen M. Lyth

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

A novel class of alkaline anion exchange membrane (AAEM) is presented, in the form of KOH-modified multilayer graphene oxide paper (GOKOH). Such membranes can be easily fabricated at large scale with varying thickness using conventional filtration techniques, and have high tensile strength (24.5 MPa). However, a large degree of swelling is observed. SEM investigations show that the morphology of GO changes after KOH-treatment, whilst XPS measurements and XRD analysis confirm successful chemical modification. The hydrogen gas permeability is several orders of magnitude lower than conventional polymer-based ionomer membranes. The maximum anion conductivity is 6.1 mS/cm at 70 °C, and the dominant charge carrier is confirmed to be OH- by utilization of anion and proton-conducting blocking layers. The ion exchange capacity is 6.1 mmol/g, measured by titration. A water-mediated reverse Grotthuss-like mechanism is proposed as the main diffusion mode of OH- ions. Finally, a prototype AAEM fuel cell is fabricated using a GOKOH membrane, confirming the applicability to real systems.

Original languageEnglish
Pages (from-to)51-61
Number of pages11
JournalJournal of Membrane Science
Volume508
DOIs
Publication statusPublished - Jun 15 2016

Fingerprint

Graphite
Oxides
Graphene
Anions
Ion exchange
graphene
Multilayers
Negative ions
anions
membranes
Membranes
oxides
Tensile Strength
Ion Exchange
Gas permeability
Ionomers
Chemical modification
Protons
Hydrogen
Permeability

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

Cite this

Alkaline anion exchange membranes based on KOH-treated multilayer graphene oxide. / Bayer, Thomas; Cunning, Benjamin V.; Selyanchyn, Roman; Daio, Takeshi; Nishihara, Masamichi; Fujikawa, Shigenori; Sasaki, Kazunari; Lyth, Stephen M.

In: Journal of Membrane Science, Vol. 508, 15.06.2016, p. 51-61.

Research output: Contribution to journalArticle

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AU - Fujikawa, Shigenori

AU - Sasaki, Kazunari

AU - Lyth, Stephen M.

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