“…In order to improve the mechanical properties of the polymeric matrix, in particular at high temperature operative conditions, advanced composite membranes have been obtained by introducing inorganic or organic fillers into the pure polymer, thus achieving stabilization through the occurrence of strong covalent or weak supramolecular interactions . In particular, sPEEK hybrid membranes , have shown improved physicochemical properties such as oxidative stability, proton conductivity, water absorption, and so on. ,− The functionalization of sPEEK polymer with organic moieties such as benzimidazole, imidazole, or triazole , or also phthalocyanine dyes, , as well as polymeric blend with polyethylenimine or polyaniline, have also been reported to improve membrane microstructure, thermal properties, water uptake, and conductivity with respect to the pristine polymer. Recently, in order to improve proton conductivity under drastic humidity conditions (relative humidity, RH < 25%), we reported an investigation on composite membranes based on sPEEK and 5,10,15,20-tetra(4-pyridyl)porphyrin (TPyP), which retain the structural and morphological properties of the pure polymer .…”