View in EDS

Electrochemical Properties of Cation-Exchange Membranes Based on Polysulfones.

Saved in:
Bibliographic Details
Title: Electrochemical Properties of Cation-Exchange Membranes Based on Polysulfones.
Authors: Parcero, Ethel1, Fernández-Carretero, Franciso J.2, Compañ, Vicente3, Herrera, Rafael1, del Castillo, Luis F.2, Riande, Evaristo4 riande@ictp.csic.es
Source: Journal of The Electrochemical Society. 2008, Vol. 155 Issue 12, pF245-F252. 8p. 1 Diagram, 5 Charts, 8 Graphs.
Subjects: Sulfones, Cations, Electrochemistry, Sulfonic acids, Ions, Electrodes, Protons
Abstract: This paper reports the electrochemical characteristics of phosphonic and sulfonic acid membranes based on commercial polyphenyl sulfone Radel. Proton membranes' permselectivity was determined from the electromotive force of concentration cells mea- sured with silver/silver chloride electrodes reversible to the anions of the electrolyte solutions. Apparent proton transport numbers in most membranes are close to the Unit, even at moderately high electrolyte concentrations. The water uptake of polyphenyl sulfone phosphonic acid membranes is lower than that of membranes containing sulfonic acid groups anchored to their structure and, as a result, the former membranes have a lower conductivity than the latter ones with a similar cation-exchange capacity. For example, the conductivity of the sulfonic acid membrane with an ion-exchange capacity of 2.06 meq/g dry membrane, equilibrated with water, is 3.56 x 10-4 S/cm at 25°C, about one order of magnitude higher than that of the phosphonic acid membrane with an ion-exchange capacity of 1.90 meq/g dry membrane, measured in the same conditions. The diffusion coefficient of protons in the membranes equilibrated with distilled water was calculated and compared with that found for Nafion 117 in the same conditions. [ABSTRACT FROM AUTHOR]
Copyright of Journal of The Electrochemical Society is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
Description
Abstract:This paper reports the electrochemical characteristics of phosphonic and sulfonic acid membranes based on commercial polyphenyl sulfone Radel. Proton membranes' permselectivity was determined from the electromotive force of concentration cells mea- sured with silver/silver chloride electrodes reversible to the anions of the electrolyte solutions. Apparent proton transport numbers in most membranes are close to the Unit, even at moderately high electrolyte concentrations. The water uptake of polyphenyl sulfone phosphonic acid membranes is lower than that of membranes containing sulfonic acid groups anchored to their structure and, as a result, the former membranes have a lower conductivity than the latter ones with a similar cation-exchange capacity. For example, the conductivity of the sulfonic acid membrane with an ion-exchange capacity of 2.06 meq/g dry membrane, equilibrated with water, is 3.56 x 10-4 S/cm at 25°C, about one order of magnitude higher than that of the phosphonic acid membrane with an ion-exchange capacity of 1.90 meq/g dry membrane, measured in the same conditions. The diffusion coefficient of protons in the membranes equilibrated with distilled water was calculated and compared with that found for Nafion 117 in the same conditions. [ABSTRACT FROM AUTHOR]
ISSN:00134651
DOI:10.1149/1.2988043