Effect of LDH platelets on the transport properties and carbonation of anion exchange membranes

We report on an extensive study on nanocomposite Anion Exchange Membranes (AEMs) based on tetramethylammonium Polysulfone ionomer and Layered Double Hydroxide (LDH) as nanofiller. The AEMs were investigated in both OH− and HCO3− forms, comparing swelling capacity and transport properties. Ionic cond...

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Bibliographic Details
Published in:Electrochimica acta 2022-01, Vol.403, p.139713, Article 139713
Main Authors: Simari, Cataldo, Lufrano, Ernestino, Rehman, Muhammad Habib Ur, Zhegur-Khais, Avital, Haj-Bsoul, Saja, Dekel, Dario R., Nicotera, Isabella
Format: Article
Language:English
Subjects:
Anion exchange membrane
Anion exchanging
Carbonation
Diffusion
Electrochemical impedance spectroscopy
Fuel cells
Hydroxides
Ion currents
Ionomers
Ions
LDH
Mechanical properties
Membranes
Nanocomposites
NMR spectroscopy
Oxidizing agents
Platelets
Polysulfone resins
Quaternized polysulfone
Spectrum analysis
Transport properties
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Summary:We report on an extensive study on nanocomposite Anion Exchange Membranes (AEMs) based on tetramethylammonium Polysulfone ionomer and Layered Double Hydroxide (LDH) as nanofiller. The AEMs were investigated in both OH− and HCO3− forms, comparing swelling capacity and transport properties. Ionic conductivity measurements were performed both by Electrochemical Impedance Spectroscopy and Ziv and Dekel's method, while the water and ions mobility by 1H Pulse Field Gradient (PFG) NMR spectroscopy. One of the most serious problems to be addressed in AEMs fuel cell technology is that of the significant loss of performance when CO2 is present in the reaction oxidant gas (e.g., air) due to the phenomenon of carbonation. In this work, the carbonation kinetics of AEMs and the effect of LDH filler were addressed through 13C NMR spectroscopy (including diffusometry and relaxometry measurements). The presence of LDH platelets in the AEM significantly reduces the conversion rate of hydroxide groups. The interaction between the polymer chains and the anionic clay lamellae creates a suitable network that benefits the membrane's ionic conductivity, its mechanical properties (DMA tests), and finally reduces the rate of alkaline degradation. [Display omitted]
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2021.139713