Self-Assembled Construction of Ion-Selective Nanobarriers in Electrolyte Membranes for Redox Flow Batteries

Zhai, Liang; Chai, Shengchao; Li, Tingting; Li, Haibin; He, Siqi; He, Haibo; Li, Xiang; Wu, Lixin; Jiang, Fengjing; Li, Haolong

doi:10.1021/acs.nanolett.3c03064

Cited by 9 publications

(2 citation statements)

References 59 publications

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“…For instance, embedding POMs into polymer matrices can create composite proton exchange membranes with stable conducting properties and good processability for fuel cell and redox flow battery applications. [24][25][26][27] Over the past decade, the combination of POM chemistry and reticular chemistry has been used to fabricate proton conductors, wherein POMs are integrated with various linkers (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

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Polyoxometalate-based reticular materials for proton conduction: from rigid frameworks to flexible networks

Li,

Chai,

2024

Dalton Trans.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Polyoxometalate-based reticular materials for proton conduction: from rigid frameworks to flexible networks

Li,

Chai,

2024

Dalton Trans.

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A Critical Update on the Design of Dense Ion‐Conducting Membranes for Redox Flow Batteries

Niccolai,

Guazzelli,

El Koura

et al. 2024

Advanced Sustainable Systems

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Recent progress in the design and preparation of dense ion‐conducting membranes, to improve redox flow batteries (RFBs) performance are critically examined. The ideal membrane has to balance a high ionic conductivity, a low crossover of ion/redox‐active species, and high coulombic and voltage efficiencies. Several ion exchange membranes are analyzed, with a focus on proton exchange membranes (PEMs), that are the most mature membrane technology in RFBs, led by the gold standard Nafion. Key developments in the design of membranes include the synthesis of tailored (co)polymers, the post‐functionalization of commercially available ones, membrane formation techniques like electrospinning, polymer blending, the additions of organic and inorganic fillers, and surface modification. Dense, asymmetric and composite membranes are reported and discussed. The effects on the membrane properties of macromolecular parameters (polymer backbone, type and length of the side chains, and the acidity of the ion‐exchanging group) are highlighted. Correlations between chemical structure, properties and performance are discussed, targeting the trade‐off between conductivity, selectivity and overall performance of the RFB cell. Although significant steps forward in the development of ion‐conducting membranes were made, improvements in electrochemical properties and long‐term stability, while reducing costs, are still challenging and necessary to a large‐scale application of RFBs.

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Supramolecular Modifying Nafion with Fluoroalkyl‐Functionalized Polyoxometalate Nanoclusters for High‐Selective Proton Conduction.

He,

Song,

Zhai

et al. 2024

Angewandte Chemie

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Proton exchange membranes with high selectivity are urgently required in energy and electronic technologies. Nafion, a state‐of‐the‐art commercial proton exchange membrane material, faces significant challenges. It suffers from the permeation of undesirable substances, like hydrogen in fuel cells and vanadium ions in redox flow batteries, due to the unmatched sizes between its ionic domains (3~5 nm) and these substances. In this work, we present a supramolecular modification strategy that simultaneously enhances the proton conductivity and selectivity of Nafion. We employ fluoroalkyl‐grafted polyoxometalate (POMs) nanoclusters as supramolecular additives to modify Nafion via co‐assembly. These POMs can precisely and robustly decorate at Nafion ionic domains, with their fluoroalkyl chains anchoring into the perfluorinated matrix while their inorganic clusters stay in the ionic regions. The hybrid membranes, with continuous proton hopping sites and nanoscale steric hindrance offered by POMs, exhibit a 56% increase in proton conductivity and a 100% improvement in proton/vanadium selectivity. This leads to significantly enhanced power density and energy efficiency in fuel cells and vanadium flow batteries, respectively. These results underscore the intriguing potential of molecular cluster additives in improving the functions of ion‐conducting membranes.

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Self-Assembled Construction of Ion-Selective Nanobarriers in Electrolyte Membranes for Redox Flow Batteries

Cited by 9 publications

References 59 publications

Polyoxometalate-based reticular materials for proton conduction: from rigid frameworks to flexible networks

Polyoxometalate-based reticular materials for proton conduction: from rigid frameworks to flexible networks

A Critical Update on the Design of Dense Ion‐Conducting Membranes for Redox Flow Batteries

Supramolecular Modifying Nafion with Fluoroalkyl‐Functionalized Polyoxometalate Nanoclusters for High‐Selective Proton Conduction.

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