Abstract
The proton transfer resistance of membrane/solution interface is investigated in this paper by employing H 2SO 4 aqueous solution with different concentration. Two commercial cation exchange membranes, Nafion1135 and PE01 membranes with different ion exchange capacity were selected as test membranes; Proton transfer resistance measurements were made by A.C impedance techniques. The proton transfer resistance of membrane/solution interface increases quickly from 0.059 to 2.22 Ω with the decrease of H 2SO 4 concentration from 2.0 to 0.05 mol/L. The ion exchange capacity of the membrane, or more exactly, the surface charge of the membrane has obviously effect on the membrane/solution resistance due to the formation of electrical double layer (EDL). The effect of electrolyte concentration on membrane/solution interface resistance can be explained by the electrical interactions between ions and charged groups of the membrane: high concentration of ions in the medium can compress the EDL and reduce the electrical interactions between ions and charged groups of the membrane.
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