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This stresses how important it is to test the stability of the redox-active compounds in situ and over a long period of time. Figure 4.15: RRDE experiment of 5 mM DHBQ in 1 M KOH. (a) Linear sweep voltam- mograms recorded in the cathodic direction on a GC disk WE at 5mVsâ1 (solid lines) and on a gold ring WE at a constant potential of â0.291 V vs. SHE (dashed lines). The area shaded in blue shows where the limiting currents were determined. (b) Experimental and theoretical collection efficiencies. 4.2.3 Carboxy-Substituted Benzoquinones The carboxy-substituted benzoquinones were of interest in the effort to find quinones that can act as the posolyte material in alkaline ORFBs. The electron-withdrawing carboxyl groups should in theory raise the redox potential compared to unsubstituted BQ/HQ, increase the solubility, and stabilise the quinone in alkaline aqueous media. 4.2.3.1 DHTA For the dicarboxy-substituted species DHTA, CV reveals rather complicated voltammetry on a GC WE. Several sets or single ill-defined peaks were observed at approximately â0.8, â0.25, 0.25, and 0.35 V vs. SHE, as seen in Figure 4.2 (c) (solid salmon line). The absence of cathodic peaks related to the anodic peaks at approximately 0.2 V and 0.35 V vs. SHE suggests that the oxidised species of DHTA is not stable at pH 14. To study if the peaks were faradaic in nature, voltammograms were recorded at several scan rates; these results 4.2. Results and Discussion 59PDF Image | Organic Redox Flow Batteries 2023
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