Barrier properties of sulfonated polysulfone/layered double hydroxides nanocomposite membrane for direct methanol fuel cell operating at high methanol concentrations. (14th August 2020)

• Record Type: Journal Article
• Authors: Lufrano, E.; Simari, C.; Lo Vecchio, C.; Aricò, A.S.; Baglio, V.; Nicotera, I.
• Is Part Of: International journal of hydrogen energy. Volume 45:Number 40(2020)
• Page Start: 20647
• Page End: 20658
• Publication Date: 2020-08-14
• Subjects: Sulfonated polysulfone -- Nanocomposite membrane -- LDH -- PFG-NMR -- DMFC; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.02.101
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: High performing and cost effective nanocomposite membranes for DMFC application are synthesized by incorporating hygroscopic layered double hydroxides (LDH) particles into sulfonated polysulfone (sPSU). A significant improvement in the dimensional stability as well as in the water and methanol molecular dynamics of the sPSU_LDH composite membrane is observed in comparison with both pristine sPSU and Nafion 212. The strong electrostatic interaction occurring between positively charged LDH platelets and negatively charged polymer chains of sPSU alters the microstructure of the ionic domains, allowing an effective reduction of the methanol permeability whilst improving the proton conductivity. The methanol crossover measurements confirmed that sPSU_LDH membranes are able to withstand high methanol concentration without significant aftermath on the chemical stability of the electrolyte. The features enable the single DMFC assembled with the sPSU_LDH nanocomposite to achieve the remarkable power density of 150 mW cm −2 at 80 °C in 5 M methanol solution. Graphical abstract: Image 1 Highlights: Layered Doubled Hydroxide (LDH) were evaluated as nanofiller in sPSU-based composites. Composite membranes revealed remarkable dimensional stability at high methanol concentration. Water and methanol dynamics in the samples investigated by NMR spectroscopy (PFG and T1 ). LDH platelets act as physical crosslinker reducing methanol crossover. Single DMFC with sPSU_LDH membranes exhibits maximum power density of 150 mW cm −2 .