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Conductive and Capacitive Properties of the Bipolar Membrane Junction Studied by AC Impedance Spectroscopy

“…Note also that for high enough electric currents, the effects associated to the water flow to the bipolar junction (in particular the finite value of the membrane mechanical permeability) could not be ignored. ,, However, we believe that this flow will not change significantly the ac impedance spectra because our experiments are carried out for electric currents below those causing desiccation of the bipolar junction [1,2]. (We know that we are working in this regime because there is no saturation in the current−voltage curves under reverse polarization. ,, When this saturation is observed, the water flow is not high enough to compensate for the water dissociation at the bipolar junction and irreversible damage of the membrane may result. This is not the case of the experiments reported here whose reproducibility was carefully checked.)…”

“…(We know that we are working in this regime because there is no saturation in the current-voltage curves under reverse polarization. 19,41,42 When this saturation is observed, the water flow is not high enough to compensate for the water dissociation at the bipolar junction and irreversible damage of the membrane may result. This is not the case of the experiments reported here whose reproducibility was carefully checked.…”

Диффузионные Пограничные Слои В Растворе На Границе С Сульфокатионообменной Мембраной После Температурной Модификации

“…Одним из главных факторов, определяющих поведение ионообменных мембран при сверхпредельных плотностях тока, являются свойства поверхности. В частности, электрическая неоднородность поверхности мембран способствует возникновению и развитию электроконвективных вихрей возле их поверхности [7][8][9][10][11][12]. Известно, что длительное воздействие тока и повышенных температур на гетерогенные ионообменные мембраны приводит к необратимым изменениям структуры, взаимосвязанных с транспортными свойствами [13][14][15][16][17][18][19][20][21][22][23].…”