Enhanced OH− Conductivity for Fuel Cells with Anion Exchange Membranes, Based on Modified Terpolymer Polyketone and Surface Functionalized Silica

Ataollahi, Narges; Tomasino, Eleonora; Cotini, Oscar; Maggio, R. Di

doi:10.3390/en15051953

Cited by 5 publications

(9 citation statements)

References 36 publications

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“…These findings suggest that the membrane conductivity is influenced by the degree of amination or IEC and also temperature, the latter affecting the mobility of the ions . The Arrhenius conductivity plots for the PET-Bm(OH – ) membranes showed a clear linear trend (Figure d), a clue for the mechanism of ion hopping conduction . Furthermore, the lowest activation energy was obtained for membranes with a higher amination period (15D) (Table ), consistent with the conductivity results.…”

Section: Resultssupporting

confidence: 83%

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: 83%

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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“…PKs also have excellent mechanical properties, including pressure and heat resistance [20]. Notably, the reaction of the 1,4-dicarbonyl units of PK with primary amine leads to the formation of N-substituted pyrrole units through the Paal-Knorr reaction [21]. This reaction occurs without using any solvents and has the advantage of having only water as a secondary product [22,23].…”

Section: Introductionmentioning

confidence: 99%

Polyketone-Based Anion-Exchange Membranes for Alkaline Water Electrolysis

et al. 2023

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Anion-exchange membranes (AEMs) are involved in a wide range of applications, including fuel cells and water electrolysis. A straightforward method for the preparation of efficient AEMs consists of polymer functionalization with robust anion-exchange sites. In this work, an aliphatic polyketone was functionalized with 1-(3-aminopropyl)imidazole through the Paal–Knorr reaction, with a carbonyl (CCO %) conversion of 33%. The anion-exchange groups were generated by the imidazole quaternization by using two different types of alkyl halides, i.e., 1,4-iodobutane and 1-iodobutane, with the aim of modulating the degree of crosslinking of the derived membrane. All of the membranes were amorphous (Tg ∼ 30 °C), thermally resistant up to 130 °C, and had a minimum Young’s modulus of 372 ± 30 MPa and a maximum of 86 ± 5 % for the elongation at break for the least-crosslinked system. The ionic conductivity of the AEMs was determined at 25 °C by electrochemical impedance spectroscopy (EIS), with a maximum of 9.69 mS/cm, i.e., comparable with that of 9.66 mS/cm measured using a commercially available AEM (Fumasep-PK-130). Future efforts will be directed toward increasing the robustness of these PK-based AEMs to meet all the requirements needed for their application in electrolytic cells.

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“…In the present work, DFT simulations were carried out on a monomer of the polyamine (PA) − ,− to study the interactions of water molecules and hydroxide anions with a single monomer, eventually extrapolating information on the hydrophilic/hydrophobic nature of the polymer. In addition, the role of functional groups in ion transport and the influence of the hydration level on the degradation of the cationic group are analyzed.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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An atomistic level study of a single monomer of polyamine interacting with water molecules and hydroxide anions (OH – ) was carried out to investigate the role of the polyamine structure in the hydrated morphology of anion exchange membranes (AEMs) for alkaline fuel cells and its influence on ionic conductivity and chemical stability. DFT calculations were performed to find the ground state of the system, studying the interactions of the solvent species with three different regions of the polymer—the amine functional group, the backbone, and the carbonyl group. The hydrophilic/hydrophobic behavior of each segment was determined, with calculated binding energies and Bader charge analysis providing a more quantitative analysis of the interactions and activation and reaction energies computed to investigate the chemical degradation mechanism. The results show the tendency of both OH – and water molecules to form water clusters in the proximity of the ionized amine group. As such, these regions constitute the preferential pathway for ionic conductivity. Besides, the essential role of the water content is pointed out, not only to enhance conductivity but also to reduce degradation in an alkaline environment. The present work provides a baseline to assess the impact of polymer chemistry on the ionic conductivity of the membrane and acts as the first step for the development of high-performance AEMs and for an improvement of the overall performance of the fuel cell.

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Enhanced OH− Conductivity for Fuel Cells with Anion Exchange Membranes, Based on Modified Terpolymer Polyketone and Surface Functionalized Silica

Cited by 5 publications

References 36 publications

Anion Exchange Membranes Based on Chemical Modification of Recycled PET Bottles

Anion Exchange Membranes Based on Chemical Modification of Recycled PET Bottles

Polyketone-Based Anion-Exchange Membranes for Alkaline Water Electrolysis

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

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