Sulfonated poly(ether ether ketone)/mesoporous silica hybrid membrane for high performance vanadium redox flow battery

Highly branched sulfonated poly(fluorenyl ether ketone sulfone)s membrane for energy efficient vanadium redox flow battery

“…The VO 2þ permeability was examined on a membrane separated diffusion cell by filling VO 2þ solution in left compartment and VO 2þ blank solution in right compartment, followed by the standard procedures [25]. The VO 2þ concentration in right compartment was measured on a Leng Guang 752S UVevis spectrometer, and the VO 2þ permeability was calculated by the following equation:…”

Aminopropyl-modified mesoporous molecular sieves as efficient adsorbents for removal of auxins

“…According to the IUPAC nomenclature mesoporous structures are characterized by the pore size from 2 to 50 nm [2]. Particularly, mesoporous silica materials have been extensively studied due to their applications in catalysis [3], sorption and separation processes [4], enzyme immobilization [5], sensor design [6], energy storage [7], antimicrobial carriers [8], and drug delivery [9] among others. Mesoporous silicas have gathered a significant attention in diverse fields of applications for their high chemical stability, large pore volume, high specific surface area and possibility of surface modification [10].…”

Effect of degree of sulfonation and casting solvent on sulfonated poly(ether ether ketone) membrane for vanadium redox flow battery

“…Consequently, the breaking strength and elastic modulus decreased with the increment of DS as shown in Table 1. The much higher breaking strength and elastic modulus of SPEEK membrane compared with that of Nafion membrane was attributed to the higher rigidity caused by the rigid chemical structure of SPEEK [34]. The percentage elongation of SPEEK membrane was high enough for VRFB.…”

“…Consequently, IEC was the ratio of consumed amount of NaOH to dry membrane weight. The DS of SPEEK in this article was calculated with the IEC result as described [34]. Proton conductivity was determined with a two-probe electrochemical impedance spectroscopy (EIS) on a PARSTAT 2273 electrochemical station.…”