Structural Effect of the Hydrophobic Block on the Chemical Stability of Ion-Conducting Multiblock Copolymers for Flow Battery

Hong, Soo Hyun; Suc, Min; Hong, Sung–Kwon; Oh, Seong‐Geun; Lee, Jang Yong

doi:10.1021/acssuschemeng.9b03182

Cited by 27 publications

(30 citation statements)

References 56 publications

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“…Hong and Lee et al synthesized block copolymers of poly( p ‐phenylene) backbone and monomers with ether, biphenyl, carbonyl, and sulfonyl skeletons, and reported the VRFB properties and durability of those membranes 32 . The synthesized membranes show lower resistance and stable operation at higher current densities than Nafion 115.…”

Section: Resultsmentioning

confidence: 99%

“…The application of hydrocarbon (HC)‐type PEMs other than Nafion to VRFBs has recently been reported 19‐32 . Sun et al synthesized cationic and anion‐exchange membranes (AEM) with a phenylene backbone and found that the AEM had relatively high durability against V 5+ , and the performance of a VRFB constructed with AEM was comparable to that with Nafion 20 .…”

Section: Introductionmentioning

confidence: 99%

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Application of high‐performance hydrocarbon‐type sulfonated polyethersulfone for vanadium redox‐flow battery

Ohira

Sakata²,

Ishida

et al. 2021

Int J Energy Res

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Summary The application of hydrocarbon‐based polymer electrolyte membranes as an alternative to Nafion membranes for vanadium redox‐flow batteries (VRFBs) has been investigated. Ionic conductivity measurements and the crossover characteristics of vanadyl ions (VO2+), as well as durability testing against V5+ in H2SO4 solution, were performed to investigate the applicability of sulfonated poly(ethersulfone) (S‐PES) membranes with high molecular weight to VRFB. The diffusion coefficient of V4+ in S‐PES was lower than that in Nafion, and the ionic conductivity was comparable to that of Nafion in S‐PES with an ion‐exchange capacity (IEC) of 1.5 meq/g. A durability evaluation of V5+ with high oxidizing power indicated that it was extremely stable compared to the sulfonated poly(etheretherketone). It was clarified that by setting the IEC to an appropriately high value and reducing the membrane thickness, the membrane characteristics can be made comparable to those of Nafion. Finally, a VRFB test was performed using S‐PES with controlled IEC and membrane thickness, whereby the high molecular weight S‐PES was shown to have relatively good performance comparable to Nafion.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Application of high‐performance hydrocarbon‐type sulfonated polyethersulfone for vanadium redox‐flow battery

Ohira

Sakata²,

Ishida

et al. 2021

Int J Energy Res

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show abstract

“…However, the membrane morphological structure and properties are elaborated by the composition and operating conditions of a PPSU solution, including concentration, additives, solvent type, temperature, kinetic factors, the coagulation bath (phase inversion process), etc. [9][10][11][12][13][14][15][16]. Thermodynamics and kinetics play significant roles during membrane development [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Recent Advancements in Polyphenylsulfone Membrane Modification Methods for Separation Applications

2022

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Polyphenylsulfone (PPSU) membranes are of fundamental importance for many applications such as water treatment, gas separation, energy, electronics, and biomedicine, due to their low cost, controlled crystallinity, chemical, thermal, and mechanical stability. Numerous research studies have shown that modifying surface properties of PPSU membranes influences their stability and functionality. Therefore, the modification of the PPSU membrane surface is a pressing issue for both research and industrial communities. In this review, various surface modification methods and processes along with their mechanisms and performance are considered starting from 2002. There are three main approaches to the modification of PPSU membranes. The first one is bulk modifications, and it includes functional groups inclusion via sulfonation, amination, and chloromethylation. The second is blending with polymer (for instance, blending nanomaterials and biopolymers). Finally, the third one deals with physical and chemical surface modifications. Obviously, each method has its own limitations and advantages that are outlined below. Generally speaking, modified PPSU membranes demonstrate improved physical and chemical properties and enhanced performance. The advancements in PPSU modification have opened the door for the advance of membrane technology and multiple prospective applications.

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“…6,7 A membrane having a high proton permselectivity against all vanadium ions is desired with good mechanical and chemical stabilities to keep the available charged capacity during the VRFB operation. 8 Various proton-conducting 9,10 or anion-conducting polymers 11,12 have been applied to VRFBs and are widely under investigation to replace the commercially available perfluorinated sulfonic acid membranes, which are expensive and have poor proton permselectivity against vanadium ions.…”

Section: ■ Introductionmentioning

confidence: 99%

Geometry-Induced Asymmetric Vanadium-Ion Permeation of PVDF Membranes and Its Effect on the Performance of Vanadium Redox Flow Batteries

Yoon

Lee

Yoon

et al. 2021

ACS Appl. Energy Mater.

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In vanadium redox flow batteries (VRFBs), size-exclusive porous separators are of great interest as alternative membranes to the conventional ionexchange membranes. In this study, we have shown geometry-induced asymmetric vanadium permeation through porous poly(vinylidene fluoride) (PVDF) membranes having asymmetric pore structures. The asymmetric pore geometry was developed via non-solvent-induced phase separation (NIPS) of the PVDF/ N,N-dimethylacetamide film in water at various coagulation bath temperatures (30−70 °C). The membranes show two distinct regions across their thickness direction, finger-like and sponge-like structures near the top and bottom of the membranes. In the permeability experiments, vanadium-ion (VO 2+ ) permeability through a fixed asymmetric membrane was significantly affected by the direction of the VO 2+ concentration gradient. The vanadium-ion permeation was higher when the finger-like top layer of the membrane faced the vanadium-ion solution than the other direction, while proton permeation was almost identical regardless of the direction. In single-cell tests, this geometry-induced asymmetric ion selectivity resulted in different performances depending on the direction of the membranes; VRFBs performed better when the sponge-like bottom layer faces the anolyte side, which contains more permeable vanadium ions (VO 2+ , VO 2 + ) through porous membranes than other ions (V 2+ , V 3+ ).

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Structural Effect of the Hydrophobic Block on the Chemical Stability of Ion-Conducting Multiblock Copolymers for Flow Battery

Cited by 27 publications

References 56 publications

Application of high‐performance hydrocarbon‐type sulfonated polyethersulfone for vanadium redox‐flow battery

Application of high‐performance hydrocarbon‐type sulfonated polyethersulfone for vanadium redox‐flow battery

Recent Advancements in Polyphenylsulfone Membrane Modification Methods for Separation Applications

Geometry-Induced Asymmetric Vanadium-Ion Permeation of PVDF Membranes and Its Effect on the Performance of Vanadium Redox Flow Batteries

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