Sulfonated graphene oxide (sGO) was used as a filler to enhance performance of sulfonated poly(ether ether ketone)(sPEEK) membrane. The sGO was firstly prepared by treating graphene oxides (GO) with sulfanilic acid at 70 °C for 20 h. The sGO was characterized by FTIR and XPS techniques. Composite membranes of various amount of sGO were fabricated via solution casting method. The properties of composite membranes were investigated by measuring ion exchange capacity (IEC), water uptake, ion conductivity and vanadium ion permeability. From the results, it was found that the IEC and water uptake of the membranes increased after adding the sGO. Ion conductivity of the sPEEK membrane also increased from 8.94*10-3 Scm-1 to 10.55*10-3 Scm-1. Moreover, permeability of vanadyl sulfate (VOSO4) through the composite membranes were decreased. These composite membranes exhibit great potential for vanadium redox flow batteries application.

The subject of this article takes benefit from advanced shading technology thought the integration of anidolic collector at clerestory window of building for achieving increment of daylight flux entering into the rear area of the room. This technology is likely to investigate the influence of clerestory aperture on the performance of daylighting collector in term of the interior daylight illuminance distribution by using the lighting tool AGi32. The empirical correlations from the use of anidolic configurations for tropical sky are proposed with high confidence interval (>85%).