Fuel cells have lately received growing attention since they allow the use of non-precious metals as catalysts, which reduce the cost per kilowatt of power in fuel cell devices to some extent. Until recent years, the major barrier in the development of fuel cells was the obtainability of highly conductive anion exchange membranes (AEMs). On the other hand, improvements show that newly enhanced anion exchange membranes have already reached high conductivity levels, leading to the suitable presentation of the cell. Currently, an increasing number of studies have described the performance results of fuel cells. Much of the literature reporting cell performance is founded on hydrogen‒anion exchange membrane fuel cells (AEMFCs), though a growing number of studies have also reported utilizing fuels other than hydrogen—such as alcohols, non-alcohol C-based fuels, and N-based fuels. This article reviews the types, performance, utilized membranes, and operational conditions of anion exchange membranes for fuel cells.
In this research, poly terephthalic acid-co-glycerol-g-maleic anhydride (PTGM) graft co-polymer was used as novel water-soluble pore formers for polyethersulfone (PES) membrane modification. The modified PES membranes were characterized to monitor the effect of PTGM content on their pure water flux, hydrophilicity, porosity, morphological structure, composition, and performance. PTGM and PES/PTGM membranes were characterized by field emission scanning electron microscopy (FESEM), Fourier-transform infrared spectroscopy (FTIR), and contact angle (CA). The results revealed that the porosity and hydrophilicity of the fabricated membrane formed using a 5 wt.% PTGM ratio exhibited an enhancement of 20% and 18%, respectively. Similarly, upon raising the PTGM ratio in the casting solution, a more porous with longer finger-like structure was observed. However, at optimum PTGM content (i.e., 5%), apparent enhancements in the water flux, bovine serum albumin (BSA), and sodium alginate (SA) retention were noticed by values of 203 L/m2.h (LMH), 94, and 96%, respectively. These results illustrated that the observed separation and permeation trend of the PES/PTGM membrane may be a suitable option for applications of wastewater treatment. The experimental results suggest the promising potential of PTGM as a pore former on the membrane properties and performance.
The experiment was carried out in the field of Horticulture and landscape Dept., College of Agriculture, University of Diyala during the summer season 2015, to study the effect of the shading and potassium spraying agents on some vegetative growth parameters and yield of cucumber cultivar Mohannad. Shading levels were (% 0, % 35 and % 65) (L0, L1, L2) respectively. Four potassium levels were used (0, 4000, 4500 and 5000) mg k l-1 which were applied spraying at vegetative growth of plant which were symboled (K0, K1, K2 and K3) respectively. Results showed that shading at level 35% (L1) significantly exceeded on the dry weight of vegetative shoot, yield of the plant and the efficiency of water, while level 65% (L2) gave the highest increase in leaves area compared to 0% shading. The concentration of proline and potassium in plant leaves was higher in the control treatment without shade (L0). The results showed that fourth level of potassium (5000 mg k g-1) was superior compared to 0 level in leaves area, dry weight of vegetative shoot, yield of the plant, proline and potassium concentration in leaves and the water use efficiency increased in values (%19.79, %14.46, %72.59, %20.00, %37.63, and %72.75) respectively. The effect of the overlap between the levels of shading and potassium concentrations was significant in the dry weight of vegetative shoot, yield of the plant and the water use efficiency at the level of interference L1K3 (shading ratio of 35%, and the potassium concentration of 5000 mg k g-1) which recorded an average (79.67 g plant-1, 11.68 ton h-1, 17.27 kg mm h-1) respectively. The leaves area of the plant exceeded the level of interference L2*K3 with average (309.78cm2 ), while the level of interference L0K3 exceeded the rest of the levels of concentration of proline and Potassium concentration in leaves with average (2.37 mg g-1, and 44.99 mg k g-1).
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