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Energies 2016, 9(12), 1003; doi:10.3390/en9121003

Reorientation of Magnetic Graphene Oxide Nanosheets in Crosslinked Quaternized Polyvinyl Alcohol as Effective Solid Electrolyte

1
Department of Chemical and Materials Engineering, and Green Technology Research Center, Chang Gung University, Kwei-shan, Taoyuan 333, Taiwan
2
Department of Orthopaedic Surgery, Chang Gung Memorial Hospital, Keelung Branch, Taoyuan 333, Taiwan
3
Department of General Dentistry, Chang Gung Memorial Hospital, Taoyuan 333, Taiwan
4
Department of Radiation Oncology, Chang Gung Memorial Hospital, Taoyuan 333, Taiwan
5
Department of Safety, Health and Environmental Engineering, Ming-Chi University of Technology, New Taipei City 243, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Haolin Tang
Received: 11 August 2016 / Revised: 11 November 2016 / Accepted: 14 November 2016 / Published: 29 November 2016
(This article belongs to the Special Issue Methanol and Alcohol Fuel Cells)
View Full-Text   |   Download PDF [2691 KB, uploaded 29 November 2016]   |  

Abstract

This work aims to clarify the effect of magnetic graphene oxide (GO) reorientation in a polymer matrix on the ionic conduction and methanol barrier properties of nanocomposite membrane electrolytes. Magnetic iron oxide (Fe3O4) nanoparticles were prepared and dispersed on GO nanosheets (GO-Fe3O4). The magnetic GO-Fe3O4 was imbedded into a quaternized polyvinyl alcohol (QPVA) matrix and crosslinked (CL-) with glutaraldehyde (GA) to obtain a polymeric nanocomposite. A magnetic field was applied in the through-plane direction during the drying and film formation steps. The CL-QPVA/GO-Fe3O4 nanocomposite membranes were doped with an alkali to obtain hydroxide-conducting electrolytes for direct methanol alkaline fuel cell (DMAFC) applications. The magnetic field-reoriented CL-QPVA/GO-Fe3O4 electrolyte demonstrated higher conductivity and lower methanol permeability than the unoriented CL-QPVA/GO-Fe3O4 membrane or the CL-QPVA film. The reoriented CL-QPVA/GO-Fe3O4 nanocomposite was used as the electrolyte in a DMAFC and resulted in a maximum power density of 55.4 mW·cm−2 at 60 °C, which is 73.7% higher than that of the composite without the magnetic field treatment (31.9 mW·cm−2). In contrast, the DMAFC using the CL-QPVA electrolyte generated only 22.4 mW·cm−2. This research proved the surprising benefits of magnetic-field-assisted orientation of GO-Fe3O4 in facilitating the ion conduction of a polymeric electrolyte. View Full-Text
Keywords: graphene oxide-iron oxide (GO-Fe3O4); crosslinked quaternized polyvinyl alcohol (CL-QPVA); magnetic field; reorientation; direct methanol alkaline fuel cell (DMAFC) graphene oxide-iron oxide (GO-Fe3O4); crosslinked quaternized polyvinyl alcohol (CL-QPVA); magnetic field; reorientation; direct methanol alkaline fuel cell (DMAFC)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Lin, J.-S.; Ma, W.-T.; Shih, C.-M.; Yu, B.-C.; Teng, L.-W.; Wang, Y.-C.; Cheng, K.-W.; Chiu, F.-C.; Lue, S.J. Reorientation of Magnetic Graphene Oxide Nanosheets in Crosslinked Quaternized Polyvinyl Alcohol as Effective Solid Electrolyte. Energies 2016, 9, 1003.

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