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Title: Correlation of Structural Differences between Nafion/Polyaniline and Nafion/Polypyrrole Composite Membranes and Observed Transport Properties

Abstract

Polyaniline/Nafion and polypyrrole/Nafion composite membranes, prepared by chemical polymerization, are studied by infrared and nuclear magnetic resonance spectroscopy, and scanning electron microscopy. Differences in vanadium ion diffusion through the membranes and in the membranes’ area specific resistance are linked to analytical observations that polyaniline and polypyrrole interact differently with Nafion. Polypyrrole, a weakly basic polymer, binds less strongly to the sulfonic acid groups of the Nafion membrane, and thus the hydrophobic polymer aggregates in the center of the Nafion channel rather than on the hydrophilic side chains of Nafion that contain sulfonic acid groups. This results in a drastically elevated membrane resistance and an only slightly decreased vanadium ion permeation compared to a Nafion membrane. Polyaniline on the other hand is a strongly basic polymer, which forms along the sidewalls of the Nafion pores and on the membrane surface, binding tightly to the sulfonic acid groups of Nafion. This leads to a more effective reduction in vanadium ion transport across the polyaniline/Nafion membranes and the increase in membrane resistance is less severe. The performance of selected polypyrrole/Nafion composite membranes is tested in a static vanadium redox cell. Increased coulombic efficiency, compared to a cell employing Nafion, further confirms the reducedmore » vanadium ion transport through the composite membranes.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1010469
Report Number(s):
PNNL-SA-76269
Journal ID: ISSN 0376-7388; JMESDO; TD5018010; TRN: US1101614
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Journal of Membrane Science, 372(1-2):11-19
Additional Journal Information:
Journal Volume: 372; Journal Issue: 1-2; Journal ID: ISSN 0376-7388
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; CHAINS; DIFFUSION; EFFICIENCY; MEMBRANES; NUCLEAR MAGNETIC RESONANCE; PERFORMANCE; POLYMERIZATION; POLYMERS; SCANNING ELECTRON MICROSCOPY; SPECTROSCOPY; SULFONIC ACIDS; TRANSPORT; VANADIUM; VANADIUM IONS

Citation Formats

Schwenzer, Birgit, Kim, Soowhan, Vijayakumar, M, Yang, Zhenguo, and Liu, Jun. Correlation of Structural Differences between Nafion/Polyaniline and Nafion/Polypyrrole Composite Membranes and Observed Transport Properties. United States: N. p., 2011. Web. doi:10.1016/j.memsci.2011.01.025.
Schwenzer, Birgit, Kim, Soowhan, Vijayakumar, M, Yang, Zhenguo, & Liu, Jun. Correlation of Structural Differences between Nafion/Polyaniline and Nafion/Polypyrrole Composite Membranes and Observed Transport Properties. United States. doi:10.1016/j.memsci.2011.01.025.
Schwenzer, Birgit, Kim, Soowhan, Vijayakumar, M, Yang, Zhenguo, and Liu, Jun. Fri . "Correlation of Structural Differences between Nafion/Polyaniline and Nafion/Polypyrrole Composite Membranes and Observed Transport Properties". United States. doi:10.1016/j.memsci.2011.01.025.
@article{osti_1010469,
title = {Correlation of Structural Differences between Nafion/Polyaniline and Nafion/Polypyrrole Composite Membranes and Observed Transport Properties},
author = {Schwenzer, Birgit and Kim, Soowhan and Vijayakumar, M and Yang, Zhenguo and Liu, Jun},
abstractNote = {Polyaniline/Nafion and polypyrrole/Nafion composite membranes, prepared by chemical polymerization, are studied by infrared and nuclear magnetic resonance spectroscopy, and scanning electron microscopy. Differences in vanadium ion diffusion through the membranes and in the membranes’ area specific resistance are linked to analytical observations that polyaniline and polypyrrole interact differently with Nafion. Polypyrrole, a weakly basic polymer, binds less strongly to the sulfonic acid groups of the Nafion membrane, and thus the hydrophobic polymer aggregates in the center of the Nafion channel rather than on the hydrophilic side chains of Nafion that contain sulfonic acid groups. This results in a drastically elevated membrane resistance and an only slightly decreased vanadium ion permeation compared to a Nafion membrane. Polyaniline on the other hand is a strongly basic polymer, which forms along the sidewalls of the Nafion pores and on the membrane surface, binding tightly to the sulfonic acid groups of Nafion. This leads to a more effective reduction in vanadium ion transport across the polyaniline/Nafion membranes and the increase in membrane resistance is less severe. The performance of selected polypyrrole/Nafion composite membranes is tested in a static vanadium redox cell. Increased coulombic efficiency, compared to a cell employing Nafion, further confirms the reduced vanadium ion transport through the composite membranes.},
doi = {10.1016/j.memsci.2011.01.025},
journal = {Journal of Membrane Science, 372(1-2):11-19},
issn = {0376-7388},
number = 1-2,
volume = 372,
place = {United States},
year = {2011},
month = {4}
}