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Organic Redox Flow Batteries 2023

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Organic Redox Flow Batteries 2023 ( organic-redox-flow-batteries-2023 )

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Chapter 4. Molecular Electrochemistry of Quinones Figure 4.3: (a) Cyclic voltammograms of 5 mM K3[Fe(CN)6] in 1 M Na2SO4 recorded on a GC WE at various scan rates, initially scanned in the cathodic direction. The dashed grey line represents a background recorded in blank solution. (b) Randles-Ševčík plot of the anodic and cathodic peak current densities. The dashed red and blue lines are extensions of the linear regressions to x = 0. Figure 4.4: (a) Cyclic voltammograms of 4 mM K4[Fe(CN)6] in 1 M KOH recorded on a GC WE at various scan rates, initially scanned in the anodic direction. The dashed grey line represents a background recorded in blank solution. (b) Randles-Ševčík plot of the anodic and cathodic peak current densities. The dashed red and blue lines are extensions of the linear regressions to x = 0. previous estimate. The RDE approach thus results in diffusion coefficients closer to the literature values the the ones determined from peak current analysis from CV, at least when the system is not reversible. This is ascribed to the RDEs achieving a steady-state current that is under mass transfer control at high overpotentials. 50

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