Water Uptake in an Anion Exchange Membrane Based on Polyamine: A First-Principles Study

Tomasino, Eleonora; Mukherjee, Binayak; Ataollahi, Narges; Scardi, Paolo

doi:10.1021/acs.jpcb.2c04115

Cited by 8 publications

(13 citation statements)

References 53 publications

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“…WU values varied from 7.5 to 13.4% and from 22.5 to 29.3% at 20 and 80 °C, respectively (Figure a). The values of λ span from 3.4 to 12.04 within the temperature range of 20 to 80 °C, as reported in Table , confirming the presence of a higher hydrophilic functional group in the membranes . All membranes maintained an SR below 5%, which is considered good dimensional stability.…”

Section: Resultssupporting

confidence: 58%

Anion Exchange Membranes Based on Chemical Modification of Recycled PET Bottles

Donnakatte Neelalochana,

Tomasino,

Di Maggio

et al. 2023

ACS Appl. Polym. Mater.

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This study presents an innovative and effective solution for recycling PET bottles as raw for producing anion exchange membranes (AEMs) for electrochemical applications. This approach reduces the demand for pristine materials, a key principle of the circular economy and sustainability. PET was subjected to chemical modification by introducing cationic functional groups followed by methylation and OH– exchange process. The amination synthesis was optimized based on reaction time. The results indicate that ion exchange capacity, water uptake, and swelling ratio properties mainly depend on the degree of cationic functionalization. The optimized AEM exhibits ionic conductivity of 5.3 × 10–2 S·cm–1 and alkaline stability of 432 h in 1 M KOH at 80 °C. The membrane properties before and after the alkaline treatment were investigated using Fourier-transform infrared spectroscopy, thermogravimetric analysis, and scanning electron microscopy analysis. Computational chemistry analysis was employed to gain further insights into the membrane degradation mechanisms and pathways under alkaline conditions. This research and its findings are a step toward using recycled materials in the field of AEM technology.

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Section: Resultssupporting

confidence: 58%

Anion Exchange Membranes Based on Chemical Modification of Recycled PET Bottles

Donnakatte Neelalochana,

Tomasino,

Di Maggio

et al. 2023

ACS Appl. Polym. Mater.

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“…[ 44 ] The absorbed water occupies these spaces to form connected channels, thus increasing the density of ion transfer paths. [ 45,46 ] Upon increasing equilibrium water content, the water clusters and ion transport channels necessary for ion transport form, and the mobility of hydroxide ions increases ( Figure a). The equilibrium water content corresponding to ionic conductivity was calculated using the empirically derived Equations (1–3) (equilibrium water content versus water activity) in Section 2.2.…”

Section: Resultsmentioning

confidence: 99%

Section: Ionic Conductivitymentioning

confidence: 99%

Anion Exchange Membranes for Fuel Cells: Equilibrium Water Content and Conductivity Characterization

Wang

Chen

Han

et al. 2023

Adv Funct Materials

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The ionic conductivity of anion exchange membranes (AEMs) directly determines the performance of anion exchange membrane fuel cells (AEMFCs), which highly depends on the hydration level of the membrane. A better understanding of the relationship between hydration level and membrane ionic conductivity is essential for membrane development and for water and thermal management analyses of AEMFCs. In this study, the effects of water activity and temperature on water uptake, equilibrium water content, and ionic conductivity of three high‐performance AEMs (Alkymer, Orion, and Pention) are quantitatively characterized via the designed experiments. The results show that Orion exhibits the lowest water uptake and highest ionic conductivity among the three membranes at high water activity and Alkymer exhibits good water‐retention capability and the highest ionic conductivity at low water activity. Empirical equations combining water activity and equilibrium water content are proposed based on fitted experimental data to define the hydration level. Empirical equations combining ionic conductivity, equilibrium water content, and temperature are fitted to illustrate the relationship between ionic conductivity and hydration level. The findings of this study can provide solid guidelines and support for the future experimental characterization and water and thermal management analyses of AEMFCs.

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“…At low water content or low hydration level and in alkaline conditions, OH − ions can react with side cation charge groups, which lessen the IEC of AEMs since only free ions play a part in the conductivity. Furthermore, the degradation of the cation charge groups will reduce the performance and lifetime of the AEMs (Tomasino et al, 2022). In addition to the lack of hydration, excessive water content is also avoided in AEMs.…”

Section: Swelling Propertiesmentioning

confidence: 99%

QPVA-Based Electrospun Anion Exchange Membrane for Fuel Cells

Samsudin

Hacker

2023

Int. J. Renew. Energy Dev.

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The anion exchange membrane is one of the core components that play a crucial and inseparable role in alkaline anion exchange membrane fuel cells. Anion exchange membranes (AEMs) were prepared from quaternary ammonium poly(vinyl alcohol) (QPVA) by an electrospinning method. QPVA was used both as material for electrospun fiber mats and as filler for the inter-fiber void matrix. The objective of this work is to investigate the influence of the inter-fibers void matrix filler concentration on the properties and performance of eQPVA-x AEMs. FTIR spectra were used to identify the chemical structures of the AEMs. The primary functional groups of PVA and quaternary ammonium-based ion conducting cation were detected. The surface morphology of QPVA nanofiber mats and eQPVA-x AEMs was observed using SEM. Electrospun nanofiber structures of QPVA with an average size of 100.96 nm were observed in SEM pictures. The ion exchange capacity, swelling properties, water uptake, and OH-ions conductivity were determined to evaluate the performance of eQPVA-x AEMs. By incorporating the QPVA matrix of 5 wt.% concentration, the eQPVA-5.0 AEMs attained the highest ion exchange capacity, water uptake, swelling properties, and OH− conductivity of 0.82 mmol g−1, 25.5%, 19.9%, and 2.26 m×s cm−1, respectively. Electrospun QPVA AEMs have the potential to accelerate the development of alkaline anion exchange membrane fuel cells.

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Water Uptake in an Anion Exchange Membrane Based on Polyamine: A First-Principles Study

Cited by 8 publications

References 53 publications

Anion Exchange Membranes Based on Chemical Modification of Recycled PET Bottles

Anion Exchange Membranes Based on Chemical Modification of Recycled PET Bottles

Anion Exchange Membranes for Fuel Cells: Equilibrium Water Content and Conductivity Characterization

QPVA-Based Electrospun Anion Exchange Membrane for Fuel Cells

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