Correlation of structural differences between Nafion/polyaniline and Nafion/polypyrrole composite membranes and observed transport properties

Schwenzer, Birgit; Kim, Soohwan; Vijayakumar, M.; Yang, Zhenguo; Li, Jun

doi:10.1016/j.memsci.2011.01.025

Cited by 84 publications

(62 citation statements)

References 37 publications

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“…[38,39] Schwenzer et al observed that, in comparison, PANI/N117 composite membranes showed a higher reduction of V 4 + ion diffusion for a given area specific resistance than PPR/N117 membranes. [37] Spectroscopic analysis revealed that PANI interacts more strongly with the sulfonic acid groups that line the Nafion channels than PPR. The result suggests that V 4 + ion diffusion depends more on the availability of sulfonic acid groups for transport, while their accessibility is not as crucial for proton conduction within the membrane.…”

Section: Vanadium Ion Permeabilitymentioning

confidence: 99%

“…As Schwenzer et al determined, there seems to be no rigid correlation between changes in proton conductivity and V 4 + ion permeation through Nafion-based composite membranes. [37] N117 membranes were modified with polyaniline (PANI) and polypyrrole (PPR), respectively. Both polymers exist in their cationic forms under strongly acidic conditions, such as those encountered in VRFBs.…”

Section: Vanadium Ion Permeabilitymentioning

confidence: 99%

“…PANI/N117 membranes degraded visibly (change in color from dark green to transparent) within a very short time during ex situ stability tests similar to the ones described in Section 2.1. [24,37] Additionally, Rychcik and Skyllas-Kazacos previously reported that PANI was unsuitable for electrode modification in VRFB applications because it was oxidized by the V 4 + /V 5 + electrolyte during cycling. [40] VRFB performance was evaluated for PPR/N117 composite membranes and, in agreement with the lower V 4 + ion diffusivity, a higher coulombic efficiency than for pure Nafion was reported.…”

Section: Vanadium Ion Permeabilitymentioning

confidence: 99%

“…But under VRFB operating conditions polypyrrole was very quickly reduced from its oxidized (conducting) form to its neutral structure, which ruled out any further use of PPR/N117 membranes for this application. [37] …”

Section: Vanadium Ion Permeabilitymentioning

confidence: 99%

“…It has been demonstrated that introducing increasing concentrations of ammonium ions into Nafion membranes decreases their water uptake and conductivity linearly with ammonium ion concentration, [50] and it has been suggested that tetrapropylammonium cations decreases transport properties in Nafion membranes by binding to sulfonic acid groups and forming hydrophilic clusters, thereby lowering the amount of sulfonic acid groups available for transport processes. [51] Nevertheless, as 1396 www.chemsuschem.org mentioned in Section 2.3, [37,39] the concept of introducing ammonium ion containing materials as cation-repelling layers into Nafion-based composite membranes has been explored by several groups. [23,37,39,45] By interfacial polymerization Luo et al introduced a positively charged layer of polyethylenimine (PEI) on the surface of N117.…”

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confidence: 99%

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Membrane Development for Vanadium Redox Flow Batteries

et al. 2011

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Large-scale energy storage has become the main bottleneck for increasing the percentage of renewable energy in our electricity grids. Redox flow batteries are considered to be among the best options for electricity storage in the megawatt range and large demonstration systems have already been installed. Although the full technological potential of these systems has not been reached yet, currently the main problem hindering more widespread commercialization is the high cost of redox flow batteries. Nafion, as the preferred membrane material, is responsible for about 11% of the overall cost of a 1 MW/8 MWh system. Therefore, in recent years two main membrane related research threads have emerged: 1) chemical and physical modification of Nafion membranes to optimize their properties with regard to vanadium redox flow battery (VRFB) application; and 2) replacement of the Nafion membranes with different, less expensive materials. This review summarizes the underlying basic scientific issues associated with membrane use in VRFBs and presents an overview of membrane-related research approaches aimed at improving the efficiency of VRFBs and making the technology cost-competitive. Promising research strategies and materials are identified and suggestions are provided on how materials issues could be overcome.

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Section: Vanadium Ion Permeabilitymentioning

confidence: 99%

Section: Vanadium Ion Permeabilitymentioning

confidence: 99%

Section: Vanadium Ion Permeabilitymentioning

confidence: 99%

Section: Vanadium Ion Permeabilitymentioning

confidence: 99%

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confidence: 99%

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Membrane Development for Vanadium Redox Flow Batteries

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Materials Science and Materials Chemistry for Large Scale Electrochemical Energy Storage: From Transportation to Electrical Grid

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Large‐scale electrical energy storage has become more important than ever for reducing fossil energy consumption in transportation and for the widespread deployment of intermittent renewable energy in electric grid. However, significant challenges exist for its applications. Here, the status and challenges are reviewed from the perspective of materials science and materials chemistry in electrochemical energy storage technologies, such as Li‐ion batteries, sodium (sulfur and metal halide) batteries, Pb‐acid battery, redox flow batteries, and supercapacitors. Perspectives and approaches are introduced for emerging battery designs and new chemistry combinations to reduce the cost of energy storage devices.

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As an emerging battery technology, metal-air flow batteries inherit the advantageous features of the unique structural design of conventional redox flow batteries and the high energy density of metal-air batteries, thus showing great potential as efficient electrochemical systems for large-scale electrical energy storage. This review summarizes the operating principles and recent progress of metal-air flow batteries from a materials and chemistry perspective, with particular emphasis on the latest advanced materials design and cell configuration engineering, which the authors divide into three categories based on the anode

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Correlation of structural differences between Nafion/polyaniline and Nafion/polypyrrole composite membranes and observed transport properties

Cited by 84 publications

References 37 publications

Membrane Development for Vanadium Redox Flow Batteries

Membrane Development for Vanadium Redox Flow Batteries

Materials Science and Materials Chemistry for Large Scale Electrochemical Energy Storage: From Transportation to Electrical Grid

Metal–Air Batteries: From Static to Flow System

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