RT Journal Article
T1 Characterization and Modeling of Free Volume and Ionic Conduction in Multiblock Copolymer Proton Exchange Membranes
A1 Gomaa, Mahmoud Mohammed
A1 Sánchez Ramos, Arturo
A1 Ureña Torres, María de las Nieves
A1 Pérez Prior, María Teresa
A1 Levenfeld Laredo, Belén
A1 García-Salaberri, Pablo A.
A1 Elsharkawy, Mohamed Rabeh Mohamed
AB Free volume plays a key role on transport in proton exchange membranes (PEMs), includingionic conduction, species permeation, and diffusion. Positron annihilation lifetime spectroscopy andelectrochemical impedance spectroscopy are used to characterize the pore size distribution and ionicconductivity of synthesized PEMs from polysulfone/polyphenylsulfone multiblock copolymers withdifferent degrees of sulfonation (SPES). The experimental data are combined with a bundle-of-tubesmodel at the cluster-network scale to examine water uptake and proton conduction. The results showthat the free pore size changes little with temperature in agreement with the good thermo-mechanicalproperties of SPES. However, the free volume is significantly lower than that of Nafion®, leading tolower ionic conductivity. This is explained by the reduction of the bulk space available for protontransfer where the activation free energy is lower, as well as an increase in the tortuosity of theionic network.
PB MDPI AG
SN 2073-4360
YR 2022
FD 2022-05-01
LK https://hdl.handle.net/10016/35051
UL https://hdl.handle.net/10016/35051
LA eng
NO This research was funded by the Spanish Agencia Estatal de Investigación (PID2019-106740RB-I00) and the Community of Madrid (PEM4ENERGY-CM-UC3M) by the call “Programade apoyo a la realización de proyectos interdisciplinares de I + D para jóvenes investigadores dela Universidad Carlos III de Madrid 2019–2020” under the frame of the “Convenio PlurianualComunidad de Madrid-Universidad Carlos III de Madrid”.
DS e-Archivo
RD 27 jul. 2024