Planar orientation of hydrophilic channels by biaxial deformation of perfluorinated sulfonic acid membranes for vanadium redox flow batteries

Hwang, Seonwoo; Lee, Doohee; Rho, Yecheol; Yoon, Kyung Seok; Yu, Duk Man; Yoon, Sang Jun; Kim, Sangwon; Hong, Young Taik; So, Soonyong

doi:10.1016/j.jpowsour.2021.229497

Cited by 15 publications

(9 citation statements)

References 53 publications

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“…In other words, upon stretching, in-plane proton conduction was enhanced, but through-plane proton conduction was hindered. This result illustrates that the hydrophilic domains are better connected along the in-plane direction, and the morphological anisotropy increased as the PEM was stretched further similar to the recent study of Hwang et al, 45 which effectively captured the evolution of hydrophilic channels upon biaxial stretching of Nafion 117. It should be noted here that the direct visualization or characterization of the morphological evolution of random SPAES PEMs upon stretching is challenging due to the absence of characteristic morphology and peaks from TEM and small-angle X-ray scattering (SAXS), respectively.…”

supporting

confidence: 84%

Enhancing Water Absorption in Sulfonated Poly(arylene ether sulfone) Polymer Electrolyte Membranes by Reducing Chain Entanglement through Constrained Deswelling

Lee,

2024

ACS Appl. Polym. Mater.

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The water uptake of a polymer electrolyte membrane is a critical parameter that determines the dimensional stability and transport behavior in various energy conversion devices. In this study, the water uptake of a sulfonated poly(arylene ether sulfone) (SPAES) membrane was controlled solely by the number of chain entanglements without employing any water absorbents. Through the constrained deswelling process, the SPAES membrane achieved a significant enhancement in water uptake, increasing by up to 210% at room temperature. This notable improvement in water uptake originates from the reduction in elastic friction, represented by the number of chain entanglements, against the volume expansion resulting from the absorption of water by the sulfuric acid groups. Evidently, the controlled deswelling procedure led to biaxial stretching of the SPAES membrane, causing an increase in its surface area and a decrease in thickness. At the microscopic level, this controlled deswelling process might prompt the alignment of hydrophilic channels along the plane directions. These changes brought about by the controlled deswelling process resulted in changes to the membrane's tensile characteristics and its transport behavior for protons and hydrogen gas.

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confidence: 84%

Enhancing Water Absorption in Sulfonated Poly(arylene ether sulfone) Polymer Electrolyte Membranes by Reducing Chain Entanglement through Constrained Deswelling

Lee,

2024

ACS Appl. Polym. Mater.

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“…The hydrophilic channels of the Nafion membrane were aligned via two different methods biaxial stretching to improve ion selectivity by suppressing permeation of vanadium ions and to significantly enlarge the available membrane area. 73 The first method biaxial stretching is to stretch a Nafion membrane during de-swelling process under the physically constrained environment with aluminum frames as depicted in Fig. 5a.…”

Section: Membranes Recently Developed For Vrfbmentioning

confidence: 99%

Review—Recent Membranes for Vanadium Redox Flow Batteries

Thiam

Vaudreuil

2021

J. Electrochem. Soc.

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Among energy storage technologies available or currently being developed, one of the most promising and attractive electrochemical system is the vanadium redox flow battery (VRFB). One of the key components in VRFB is the membrane required to separate the positive and negative half-cells. The role of this membrane is to prevent cross-mixing of vanadium ions while allowing the transport of certain ions to maintain the electrolytes’ electro-neutrality. Such a membrane represents a sizeable fraction of the system’s total cost while significantly affecting performance. Current research mostly consists of developing high-performance membranes offering high ionic conductivity, low permeability to vanadium ions, and good chemical and mechanical stability. A lower membrane cost is also desirable in order to reduce the overall system costs. This paper provides a comprehensive review of VRFB membranes and recent developments to allow for a better understanding of VRFB membranes’ characterization techniques and their different manufacturing methods, while exploring materials suitable as VRFB membrane. Modeling of ion transport mechanisms through the separator and development prospects for a high-performance VRFB membrane are also discussed. The characteristics of the newly developed membranes are summarized to serve as a reference guide for researchers.

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“…However, it is highly permeable and expensive, making it unsuitable for large-scale applications [128], [129]. Different kinds of membranes including cation exchange membrane [130]- [133], anion exchange membrane [134]- [137], amphoteric ion exchange membrane [138]- [141], and porous membranes [142]- [145] have been proposed and developed for V-RFB systems.…”

Section: ) Membranementioning

confidence: 99%

A Review on Vanadium Redox Flow Battery Storage Systems for Large-Scale Power Systems Application

Aluko

Knight

2023

IEEE Access

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In the wake of increasing the share of renewable energy-based generation systems in the power mix and reducing the risk of global environmental harm caused by fossil-based generation systems, energy storage system application has become a crucial player to offset the intermittence and instability associated with renewable energy systems. Due to the capability to store large amounts of energy in an efficient way, redox flow batteries (RFBs) are becoming the energy storage of choice for large-scale applications. Vanadium-based RFBs (V-RFBs) are one of the upcoming energy storage technologies that are being considered for large-scale implementations because of their several advantages such as zero cross-contamination, scalability, flexibility, long life cycle, and non-toxic operating condition. This review presents the current state of the V-RFB technology for power system applications. The basic working operation of the V-RFB system with the principle of operation of its major components, the design considerations, and the limitations of each component are discussed. It presents technical information to improve the overall performance of the V-RFB by considering the materials of the cell components, modeling methods, stack design, flow rate optimization, and shunt current reduction.INDEX TERMS Energy storage system, flow battery, renewable energy, vanadium redox flow battery.

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Planar orientation of hydrophilic channels by biaxial deformation of perfluorinated sulfonic acid membranes for vanadium redox flow batteries

Cited by 15 publications

References 53 publications

Enhancing Water Absorption in Sulfonated Poly(arylene ether sulfone) Polymer Electrolyte Membranes by Reducing Chain Entanglement through Constrained Deswelling

Enhancing Water Absorption in Sulfonated Poly(arylene ether sulfone) Polymer Electrolyte Membranes by Reducing Chain Entanglement through Constrained Deswelling

Review—Recent Membranes for Vanadium Redox Flow Batteries

A Review on Vanadium Redox Flow Battery Storage Systems for Large-Scale Power Systems Application

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