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http://hdl.handle.net/10773/36957
Title: | Conductive polysaccharides-based proton-exchange membranes for fuel cell applications: the case of bacterial cellulose and fucoidan |
Author: | Vilela, Carla Silva, Ana C. Q. Domingues, Eddy M. Gonçalves, Gil Martins, Manuel A. Figueiredo, Filipe M. L. Santos, Sónia A. O. Freire, Carmen S. R. |
Keywords: | Bacterial cellulose Fucoidan Proton-exchange membranes Protonic conductivity Fully bio-based separators |
Issue Date: | 15-Feb-2020 |
Publisher: | Elsevier |
Abstract: | Conductive natural-based separators for application in polymer electrolyte fuel cells (PEFCs) were fabricated by combining a bacterial polysaccharide, i.e. bacterial cellulose (BC), and an algae sulphated polysaccharide, i.e. fucoidan (Fuc). The diffusion of fucoidan aqueous solution containing a natural-based cross-linker, viz. tannic acid, into the wet BC nanofibrous three-dimensional network, followed by thermal cross-linking, originated fully bio-based proton exchange membranes (PEMs). The PEMs present thermal-oxidative stability in the range of 180-200 °C and good dynamic mechanical performance (storage modulus ≥ 460 MPa). Additionally, the BC/Fuc membranes exhibit protonic conductivity that increases with increasing relative humidity (RH), which is a typical feature for numerous water-mediated proton conductors. The traditional Arrhenius-type plots demonstrate a linear behaviour with a maximum protonic conductivity of 1.6 mS cm-1 at 94 °C and 98 % RH. The results showed that these fully bio-based conductive membranes have potential as eco-friendly alternatives to other PEMs for application in PEFCs. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/36957 |
DOI: | 10.1016/j.carbpol.2019.115604 |
ISSN: | 0144-8617 |
Appears in Collections: | TEMA - Artigos CICECO - Artigos DFis - Artigos DEM - Artigos DQ - Artigos DEMaC - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Conductive polysaccharides-based proton-exchange membranes for fuel.pdf | 4.86 MB | Adobe PDF | View/Open |
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