Sulfonated poly(etheretherketone) based nanocomposite membranes containing POSS-SA for polymer electrolyte membrane fuel cells (PEMFC)

Kim, Sang Woo; Choi, Seung-Young; Rhee, Hee‐Woo

doi:10.1016/j.memsci.2018.08.040

Cited by 23 publications

(7 citation statements)

References 19 publications

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“…The nanosized core and eight organic substitutes endow POSS hybrid materials with good dispersion and compatibility on a nanoscale or a molecular level. Currently, POSS has attracted considerable interest in the applications of PEMs to enhance the overall performance. , Li et al reported a bifunctional POSS with vinyl and sulfonic acid groups ( Vi -POSS-SO 3 Na) and implanted it into the Nafion matrix to prepare a hybrid membrane for direct methanol fuel cells (DMFCs). The membrane bearing Vi -POSS-SO 3 Na showed a significantly high proton conductivity of 121 mS cm –1 at 80 °C.…”

Section: Introductionmentioning

confidence: 99%

Surface-Modified Approach to Fabricate Nafion Membranes Covalently Bonded with Polyhedral Oligosilsesquioxane for Vanadium Redox Flow Batteries

Zhang

et al. 2022

ACS Appl. Mater. Interfaces

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An aminopropyl isobutyl polyhedral oligosilsesquioxane (NH2-POSS) surface-modified Nafion membrane has been designed by chemical grafting for vanadium redox flow batteries (VRFBs). NH2-POSS is a cage-like macromer consisting of an inorganic Si8O12 core surrounded by seven inert isobutyl groups and one active aminopropyl group. The sulfonic acid groups on the surface of Nafion can be activated by 1,1-carbonyldiimidazole for further modification with NH2-POSS. Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) prove that NH2-POSS has been successfully grafted on the surface of a Nafion 115 membrane. Although the proton conductivity decreases slightly, the organic–inorganic hybrid membranes display enhanced ion selectivity and excellent dimensional stability with lower water uptake and swelling ratio than Nafion 115. Moreover, two-dimensional-grazing incidence X-ray diffraction (2D-GIXRD) reveals that the introduction of NH2-POSS forms a POSS layer on the surface of the membrane and narrows the space of Nafion clusters, which helps to block VO2+ permeation. A VRFB with the surface-modified Nafion membrane displays an outstanding performance with an average Coulombic efficiency (CE) of 98.7% and energy efficiency (EE) of 84.5% at a current density of 80 mA cm–2, superior to those of the Nafion 115 membrane (CE = 95.7%, EE = 81.7%). Furthermore, the cell holds a high capacity retention of 49.2% after 1000 charge–discharge cycles, in contrast to that of 41.9% for the cell with Nafion 115 after only 200 cycles. The results suggest that the surface-modified hybrid membrane is a promising strategy to overcome the vanadium ion crossover in VRFBs.

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Section: Introductionmentioning

confidence: 99%

Surface-Modified Approach to Fabricate Nafion Membranes Covalently Bonded with Polyhedral Oligosilsesquioxane for Vanadium Redox Flow Batteries

Zhang

et al. 2022

ACS Appl. Mater. Interfaces

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“…In Figure 8, four characteristic scattering peaks are distinguished. The first peak is related to the matrix knee of the polymer, 48,49 the second and third peaks correspond to the incorporation of the imidazole and sulfonic groups as ionic moieties, 48 and the last one near 10 nm −1 represents the aromatic rings in the polymer matrix 46 . The position of these peaks is used to calculate the interstitial distances by Bragg's law (Equation ) 38 …”

Section: Resultsmentioning

confidence: 99%

Sulfonated poly(styrene‐isobutylene‐styrene) grafted with hexyl‐ and butyl‐imidazolium chloride ionic liquids

Barrios‐Tarazona

Suleiman

2021

Journal of Polymer Science

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In this work, novel sulfonated poly(ionic liquid)s block-copolymers based on poly(styrene-isobutylene-styrene) (SIBS) are synthesized for chemical protective clothing (CPC) applications. The synthesis consists of the chloromethylation of SIBS, followed by the incorporation of N-alkylimidazole through chemical grafting, and concluding with sulfonation of the resulting compound. Properties of the membranes are determined as a function of different N-alkylimidazoles (butylimidazole and hexylimidazole) and sulfonation levels (7-23 mol%). Results show that the incorporation of imidazole and sulfonic groups increases the thermal stability of SIBS as well as its water absorption capabilities. The interaction between the ionic moieties in the polymeric matrix allows the formation of hydrophilic nanochannels, which promote the transport of permeants through the membrane. The high water vapor transmission rate (above 2000 g m À2 day À1 ) and values of selectivity (~50) demonstrate that the breathability of the synthesized membrane is improved while blocking the passage of dimethyl methylphosphonate (simulant of agent Sarin). The above mentioned observations suggest that sulfonated SIBS-PIL's membranes are potential materials for CPC applications.

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“…MEA was determined through the electrochemical impedance spectroscopy (EIS) technique. 217 RΩ includes small ohmic loss the electrode and membrane resistance, an x-axis increased contact resistance between membranes and electrodes cause significant changes in surface roughness and morphology of membrane. 221…”

Section: Single-cell Performancementioning

confidence: 99%

A review of alternative polymer electrolyte membrane for fuel cell application based on sulfonated poly(ether ether ketone)

2021

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A proton exchange membrane (PEM) is a crucial component in a fuel cell application as a proton carrier and separator for the anode and cathode. Sulfonated poly(ether ketone ether) (SPEEK) has been recognized as one of the promising alternatives PEM in fuel cell application due to the advantagious properties of SPEEK, including the high thermal stability, proton conductivity, mechanical strength, low fuel crossover, and easy to operate. The proton conductivity properties of SPEEK are influenced by the degree of sulfonation (DS). In practical, high DS of SPEEK-based membrane will produce high proton conductivity and a high density of sulfonic acid functional groups grafted into the polymer backbone. However, the excessive production of DS will have side effects on the stability of membrane dimensional and chemical properties.Meanwhile, the low DS of SPEEK has reduced the ability to diffuse the proton within the polymeric matrix. Therefore, getting the optimal DS SPEEK is very important to fabricate the alternative of PEM. But this process is hard. Thus, the researchers have modified the SPEEK membrane with various types of nanoparticles as a filler. This is one of the promising efforts to improve the SPEEK membrane properties and fuel cell application performance. This review aimed to discuss eight conductive materials such as silica, clay, metal oxide, heteropolyacids, carbon, graphene, metal organic framework, and zeolite used as fillers to develop the PEM component based on SPEEK for fuel cell applications. This review also comprehensively discusses the characterization of SPEEK-based membrane modification, including mechanical properties, water intake, proton conductivity, thermal properties, fuel permeability, crystal and structural analysis, chemical oxidation stability, and single-cell performance. Thus, this article can serve as a reference for researchers to planning the best strategies to optimize the properties and performance of the SPEEKbased membrane for fuel cell application.

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Sulfonated poly(etheretherketone) based nanocomposite membranes containing POSS-SA for polymer electrolyte membrane fuel cells (PEMFC)

Cited by 23 publications

References 19 publications

Surface-Modified Approach to Fabricate Nafion Membranes Covalently Bonded with Polyhedral Oligosilsesquioxane for Vanadium Redox Flow Batteries

Surface-Modified Approach to Fabricate Nafion Membranes Covalently Bonded with Polyhedral Oligosilsesquioxane for Vanadium Redox Flow Batteries

Sulfonated poly(styrene‐isobutylene‐styrene) grafted with hexyl‐ and butyl‐imidazolium chloride ionic liquids

A review of alternative polymer electrolyte membrane for fuel cell application based on sulfonated poly(ether ether ketone)

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