Polyketone-Based Anion-Exchange Membranes for Alkaline Water Electrolysis

Author:

Racchi Ottavia1,Baldassari Rebecca1,Araya-Hermosilla Esteban2ORCID,Mattoli Virgilio2ORCID,Minei Pierpaolo3,Pozio Alfonso4ORCID,Pucci Andrea15ORCID

Affiliation:

1. Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Moruzzi, 13, 56124 Pisa, Italy

2. Center for Materials Interfaces @SSSA, Istituto Italiano di Tecnologia, Viale Rinaldo Piaggio, 34, 56025 Pontedera, Italy

3. SPIN-PET, Via R Piaggio, 32, 56025 Pontedera, Italy

4. ENEA CR Casaccia, Via Anguillarese, 301, 00123 Rome, Italy

5. CISUP, Centro per l’Integrazione della Strumentazione dell’Università di Pisa, Lungarno Pacinotti, 43, 56126 Pisa, Italy

Abstract

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.

Funder

Ministry of Economic Development

Publisher

MDPI AG

Subject

Polymers and Plastics,General Chemistry

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