Preparation and performance of sulfonated poly(ether ether ketone) membranes enhanced with ammonium ionic liquid and graphene oxide

Abstract

The exploration of proton exchange membranes with excellent performance has always been under focus for improving the performance of proton exchange membrane fuel cells. In this study, novel ternary composite proton exchange membranes based on sulfonated poly(ether ether ketone) (SPEEK), triethylamine phosphate (TEAP) as the ammonium ionic liquid (AIL), and graphene oxide (GO) were prepared. The prepared membranes were characterized for their physical, physico-chemical, structural, morphological, thermal, mechanical, and electrical characteristics. The thermal stability of the SPEEK membrane was improved by the addition of GO and TEAP. GO was inserted into the composite membrane to form proton transfer channels. The amine ions in AIL formed acid–base pairs with the sulfonic acid group, whereas the oxygen-containing group on GO formed hydrogen bonds with the phosphate group. These groups interacted with each other to form a honeycomb-like structure, which anchored the AIL in the membrane and reduced its loss, providing additional sites for proton transport at higher temperatures. The proton conductivity of the SPEEK/AIL/GO-2 membrane reached 17.345 mS/cm at 120°C, which was 2.09 times higher than that of the pristine SPEEK membrane. This study provides the possibility for better preparation of proton exchange membranes used for high-temperature proton exchange membrane fuel cells.

Preparation and Sound Insulation Performance of Polystyrene Building Flame Retardant and Thermal Insulation Building Materials

“…It is one of the most widely used plastics in the world today. It can be used in the square shock packaging of electrical appliances, instruments, handicrafts, and other vulnerable valuables, as well as the packaging of fast food [1]. Waste EPS still maintains its good physical and chemical properties.…”

Enhanced proton conductivity of sulfonated poly(ether ether ketone) membranes by constructing cation‐π through doping ammonium ionic liquid and graphene oxide

“…In addition, the benzothiazole cations form acid-base pairs with the sulfonic acid group, which act as low-energy barrier channels on the channel surface, and the continuous path ensures efficient proton transfer through these transport sites. [47][48][49] Compared with the doping of IL and GO alone, 50 the proton conductivity of the prepared composite membranes was not much enhanced, but the IL loss rate was well controlled. It is due to the adsorption of IL on GO through non-covalent interaction that the loss of IL is reduced.…”