Acid-Base Electrolyte at Each Half-Cell with a Single Zeolite Membrane

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Acid-Base Electrolyte at Each Half-Cell with a Single Zeolite Membrane ( acid-base-electrolyte-at-each-half-cell-with-single-zeolite- )

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Journal of The Electrochemical Society, 2021 168 020531 Figure 1. (A) Photograph of the prototype flow cell with a zeolite membrane. (B) Schematic diagram of the V-S redox flow battery system. transfer because of the high base electrolyte medium. On the other hand, the lower internal resistance observed in the acid-base electro- lyte combination using the zeolite-coated ceramic membrane con- firmed the size selectivity, here the protonated water molecule. The concentration of H+ of the zeolite in the VRFB (vanadium redox flow battery) electrolyte solutions was 5100 μmol cm−3, which is greater than that in Nafion 117 (1.6–3.2 μmol cm−3).34 Therefore, the size- selective permeation of the zeolite membrane considered as deter- mining factor in the ion transport and may support to work singly in the acid-base electrolyte combination. Figure 4A presents the CV trace of V4+ oxidation in acid-acid electrolyte combination at each half-cell at the graphite electrode. Oxidation and reduction peaks were observed at 1.15 V and 1.0 V, respectively, showing a peak potential difference of 150mV (Fig. 4A curve a). At the same time, the V4+ oxidation peak shifted to a less positive potential of 0.83V, and its counterpart peak appeared at 0.70 V with the peak potential difference of 130 mV (Fig. 4A curve b) using acid-base electrolyte combination at each half-cell. The reversibility of the V4+/V5+ system in both combina- tions of electrolytes was maintained, but the redox peak potential shifted to a less positive potential of approximately 300 mV. This means that V4+ oxidation is more facile in the acid-base combina- tion, or the base pH in the counter electrode containing the half-cell forced a shift in the V4+ oxidation peak to a 300 mV less positive

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