Abstract
Nafion–sulfonated polyether ether ketone (SPEEK)–graphene oxide (GO) nanocomposite membranes were prepared. The effects of the degree of oxidation of GO on the physical properties of the nanocomposites have been investigated using two varieties of GOs with low degree (GO) and high degree (HGO) of oxidation. The concentrations of the oxygen functionality in GO and HGO are 28.4% and 31.8%, respectively as calculated by XPS analysis, but the size of HGO is less than that of GO. Thermal stabilities of the composites are similar except for minor differences in weight loss of various composites due to the presence of different amounts of –SO3H and oxygen functionalities. The storage modulus of the HGO-based composite is the highest among the composites and the addition of SPEEK is detrimental to the mechanical properties in all cases. Optimum proton conductivity of 322.2mScm−1 is noted with Nafion containing 1wt% SPEEK and 0.75wt% HGO at 100% relative humidity (RH) and 90°C compared to 198mScm−1 under similar conditions. The maximum power density of 621.2mWcm−2 has been noted for the same composite membrane at 80°C and 100% RH.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call