期刊
JOURNAL OF MEMBRANE SCIENCE
卷 508, 期 -, 页码 51-61出版社
ELSEVIER
DOI: 10.1016/j.memsci.2016.02.017
关键词
Alkaline fuel cell; Anion exchange membrane; Fuel cells; Graphene oxide; Ionic conductivity
资金
- International Institute for Carbon Neutral Energy Research - World Premier International Research Center Initiative (WPI), MEXT, Japan [WPI-I2CNER]
- Japan Science and Technology Agency (JST) through it's Center of Innovation Science and Technology based Radical Innovation and Entrepreneurship Program (COI Program)
- International Research Center for Hydrogen Energy, Kyushu University
- Grants-in-Aid for Scientific Research [26889045] Funding Source: KAKEN
A novel class of alkaline anion exchange membrane (AAEM) is presented, in the form of KOH-modified multilayer graphene oxide paper (GO(KOH)). 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 degrees 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 GO(KOH) membrane, confirming the applicability to real systems. (C) 2016 Elsevier B.V. All rights reserved.
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