Preparation and characterization of high ionic conducting alkaline non-woven membranes by sulfonation

Investigation of the through-plane impedance technique for evaluation of anisotropy of proton conducting polymer membranes

“…A cell equipped with mercury electrodes was used by Blachot et al [12] to measure ionic conductivity of sulfonated polyimide membranes. A 2-probe stainless steel electrochemical cell was used to measure ionic conductivity of alkaline membranes by Wu et al [14,17] and Yang [16]. A cell comprising of graphite current collectors, carbon paper electrodes was used by Silva et al [21].…”

“…Many studies describe the evaluation of through-plane membrane resistance by simply taking a linear extrapolation of the impedance spike in the Nyquist plot to the Z 0 -axis and by accepting the intercept as the R b value [11,12,14,16,17]. A more accurate method is to use the diameter of the semicircle; but, unfortunately, complete semicircles are not usually attainable.…”

“…There are few reports [4,5,7,10,[13][14][15][16][17][18][19][20][21][22] on the application of the ex situ through-plane impedance technique for ion conducting membranes using various methodology and apparatus for the through-plane conductivity measurement. A through-plane measurement has been described by Ma et al …”

A Vital Source of Energy for 21st Century: Review On Alkaline Fuel Cell

“…The substitution of Al by Ni increases the catalyst activity the maximum being exhibited by Ni oxide as electrocatalysis were found active toward oxygen reduction and evolution reaction (Rashkova et al, 2002). Wu et al (2006) synthesized non-porous amorphous manganese dioxide by the mean of aqueous redoxsol-gelroute. The catalyst was analyzed using oxygen or nitrogen saturated KOH solution through cyclic voltammerty they pointed out that only one reduction peak is obtained and the second peak could not be obtained because of the range of potential chosen.…”

“…Main mechanical properties; tensile strength, breaking elongation and modulus has been evaluated. The obtained results suggested that in order to ensure the composite membranes to have desired mechanical properties and higher conductivity and to be possibly used in an alkaline fuel cell, the ratio of glutaraldehyde to chitosan should be selected between 4 and 5 wt.% and the content of potassium hydroxide loaded inside the inner layer should be controlled below 6 wt.% Wu et al (2006) prepared of alkaline, high ionic conducting membrane separators with lower cost using non-woven Poly Propylene/Poly Ethylene (PP/PE) core-shell sheet membranes. Sulfonation was employed to enhance the membrane anionic conductivity by improved hydrophilicity and more amorphous structure of the polymer.…”