Sulfonation degree effect on ion-conducting SPEEK-titanium oxide membranes properties

Marrero, Jacqueline Costa; Gomes, Aílton de Souza; Wang, Hui; Filho, José Carlos Dutra; Oliveira, Vivianna Silva de

doi:10.1590/0104-1428.07216

Cited by 16 publications

(5 citation statements)

References 11 publications

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“…It is an equivalent electrical circuit that consists of an active electrolyte resistance ( R S ) in series with the parallel combination of an active charge transfer resistance ( R z ), the double-layer capacitance ( C ) and Warburg impedance ( W ). 60 From the spectra it can be seen that the impedance and frequency are inversely related (Fig. 5), i.e.…”

Section: Resultsmentioning

confidence: 98%

An aqueous polysulfide redox flow battery with a semi-fluorinated cation exchange membrane

Sreenath,

P. S.,

Pawar

et al. 2024

Energy Adv.

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Section: Resultsmentioning

confidence: 98%

An aqueous polysulfide redox flow battery with a semi-fluorinated cation exchange membrane

Sreenath,

P. S.,

Pawar

et al. 2024

Energy Adv.

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“…This could be attributed to the formation of ion clusters between the sulfonic groups of SPEEK and the sulfonic groups on the cavities of SSNW-1, which favors the transmission of protons . However, the composite membranes with 4 and 5 wt % SSNW-1 content presented higher AR than those with 3 wt %, probably due to the aggregation of SSNW-1, which blocks the proton transport pathway …”

Section: Resultsmentioning

confidence: 98%

“…34 However, the composite membranes with 4 and 5 wt % SSNW-1 content presented higher AR than those with 3 wt %, probably due to the aggregation of SSNW-1, which blocks the proton transport pathway. 35 The morphologies of the composite membranes were investigated using SEM. As shown in Figure 2a, the pure SPEEK membrane showed a smooth and compact surface, whereas the SPEEK/SSNW-5% composite membrane exhibited a rough surface morphology with evident agglomeration (Figure 2c).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Sulfonated Poly(ether Ether Ketone)/Sulfonated Covalent Organic Framework Composite Membranes with Enhanced Performance for Application in Vanadium Redox Flow Batteries

Chen

et al. 2022

ACS Appl. Energy Mater.

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In this study, a series of sulfonated poly(ether ether ketone) (SPEEK)-based ionic exchange membranes were prepared by introducing sulfonated Schiff base network-type (SSNW-1) covalent organic frameworks, which exhibited enhanced properties for application in vanadium redox flow batteries (VRFBs). Compared with the pure SPEEK and Nafion 212 membranes, the SPEEK/SSNW-x% composite membranes showed lower vanadium permeability owing to the size screening of SSNW-1. The vanadium permeability of the SPEEK/SSNW-x% composite membranes decreased with an increase in the SSNW-1 content; the lowest vanadium permeability of 4.02 × 10 −9 cm 2 s −1 was observed with SPEEK/SSNW-3%. However, the vanadium permeability of the composite membranes increased when the SSNW-1 content exceeded 3 wt % because of the aggregation of SSNW-1. In addition, the SPEEK/SSNW-x% composite membrane exhibited good thermal stability and mechanical properties. The VRFB assembled with the SPEEK/SSNW-3% composite membrane showed a Coulombic efficiency (CE) of 99.8% at a current density of 80 mA cm −2 . In contrast, the values with the pure SPEEK and Nafion 212 membranes under the same conditions were 95.4 and 90.4%, respectively. The VRFBs assembled with the SPEEK/ SSNW-3% membrane also exhibited higher voltage efficiency (VE) (85.9%) than that of Nafion 212 (85.0%) and SPEEK (82.6%). Finally, the capacity retention rate of VRFB assembled with the SPEEK/SSNW-3% composite membrane was observed to be superior to that with the pure SPEEK and Nafion 212 membranes. Hence, this study provides a direction for preparing membranes with enhanced performance for VRFB applications.

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“…SPEEK/TC and SPEEK/TNC hybrid membranes show better methanol rejection, antiswelling properties, and thermal stability than pure SPEEK membranes due to electrostatic interactions between SPEEK and inorganic nanoparticles. Marrero et al 52 has synthesized membranes based on SPEEK (with SD = 63% and 50%) and titanium oxide using the sol-gel process. The ion exchange capacity increases with increasing SD.…”

Section: Sol-gel Methodsmentioning

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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Sulfonation degree effect on ion-conducting SPEEK-titanium oxide membranes properties

Cited by 16 publications

References 11 publications

An aqueous polysulfide redox flow battery with a semi-fluorinated cation exchange membrane

An aqueous polysulfide redox flow battery with a semi-fluorinated cation exchange membrane

Sulfonated Poly(ether Ether Ketone)/Sulfonated Covalent Organic Framework Composite Membranes with Enhanced Performance for Application in Vanadium Redox Flow Batteries

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

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