Dependence of the mechanical and electrical properties on the acid content in PVA+H$_{3}$PO$_{2}$+H$_2$O membranes

M. E, J.E. Castillo, F. Bedo, a. , J. E, R. A

Abstract


In this paper we report elastic modulus and ionic conductivity measurements in proton-exchange membranes based on poly (vinyl alcohol) (PVA), as a function of the acid (H$_{3}$PO$_{2}$) concentration and temperature. Tensile stress-strain test (nominal stress) was performed at low rate deformation, with acid concentration between 0.0 to 3.0 given in P/OH ratios. Results show that the elastic modulus, the elastoplastic modulus and the yield stress decrease as acid concentration increases. Ionic conductivity was obtained using the impedance spectroscopy technique on samples with the same acid concentrations, which shows an improvement in ionic conductivity of PVA+H$_{3}$PO$_{2}$+H$_2$O within the range 10$^{-3}$ - 10$^{-1}$ S cm$^{-1}$ as the acid concentration increases. The results obtained by comparing mechanical and electric properties, show that they are both directly linked to the acid content and water activity, thus these properties can be engineered to meet the appropriate conditions for an efficient fuel cell operation.

Keywords


Elastic modulus; stress; impedance spectroscopy; dc conductivity; polymer electrolyte

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REVISTA MEXICANA DE FÍSICA, year 67, issue 2, March-April 2021. Bimonthly Journal published by Sociedad Mexicana de Física, A. C. Departamento de Física, 2º Piso, Facultad de Ciencias, Universidad Nacional Autónoma de México, Ciudad Universitaria, Alcaldía Coyacán, C.P. 04510 , Ciudad de México. Apartado Postal 70-348. Tel. (+52)55-5622-4946, https://rmf.smf.mx/ojs/rmf, e-mail: rmf@ciencias.unam.mx. Chief Editor: José Alejandro Ayala Mercado. INDAUTOR Certificate of Reserve: 04-2019-080216404400-203, ISSN: 2683-2224 (on line), 0035-001X (print), both granted by Instituto Nacional del Derecho de Autor. Responsible for the last update of this issue, Technical Staff of Sociedad Mexicana de Física, A. C., Fís. Efraín Garrido Román, 2º. Piso, Facultad de Ciencias, Universidad Nacional Autónoma de México, Ciudad Universitaria, Alcaldía Coyacán, C.P. 04510 , Ciudad de México. Date of last modification, March 1st., 2021.

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