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List of Figures 128 3.11 Bode magnitude and phase angle plots of the impedance shown in Figure 3.10........................................ 32 3.12 Nyquist plots of the simulated impedance of a resistor, capacitor, constant- phaseelementatvariousvaluesofq,andinductor.. . . . . . . . . . . . . . 33 3.13 Nyquist plots of the simulated impedance of semi-infinite, transmissive, andreflectivelineardiffusionelements. .................... 36 3.14 SchematicoftheRandlesequivalentcircuit. . . . . . . . . . . . . . . . . . 37 3.15 Nyquist plot of the simulated impedance of a Randles circuit. . . . . . . . 37 3.16 Schematic of the transmission line ladder network inside a single pore of a flooded porous electrode contacted to a membrane and current collector. . 39 3.17 Nyquistplotsofthesimulatedimpedanceofaporouselectrodeunderblock- ingandnon-blockingconditions ........................ 40 3.18 Schematic of the equivalent circuit used to model symmetric flow cells. . . 41 3.19SchematicofaVoigtcircuit........................... 43 3.20 IllustrativeKramers-Kronigresidualsplots.. . . . . . . . . . . . . . . . . . 43 4.1 Structural formulas and abbreviations of the redox-active compounds in- vestigatedinthiswork.............................. 46 4.2 Cyclic voltammograms of the investigated compounds recorded at 50 mV s−1 onGCandgoldWEsatvariouspHvalues................... 48 4.3 Cyclic voltammograms and Randles-Ševčík plot of 5mM K3[Fe(CN)6] in 1MNa2SO4recordedonaGCWE....................... 50 4.4 Cyclic voltammograms and Randles-Ševčík plot of 4mM K4[Fe(CN)6] in 1MKOHrecordedonaGCWE. ....................... 50 4.5 RDE experiment of 5 mM K3[Fe(CN)6] in 1 M KCl+0.01 M KOH recorded onaGCWE................................... 51 4.6 RDE experiment of 5 mM K4[Fe(CN)6] in 1 M KCl+0.01 M KOH recorded onaGCWE................................... 52 4.7 Side-by-side view of the Tafel plots presented in Figures 4.5 and 4.6. . . . . 52 4.8 Bulk electrolysis of 10 mM [Fe(CN)6]4 – in 1 M KOH recorded on a carbon meshWE..................................... 53 4.9 Successive cyclic voltammograms of 5 mM HQ in 1 M KOH recorded on a GCWE...................................... 54 4.10 Cyclic voltammograms and Randles-Ševčík plot of 1 mM HQ in 1 M H2SO4 recordedonaGCWE.............................. 55 4.11 RDE experiment of 1mM HQ in 1M H2SO4 recorded on a GC WE. . . . . 56 4.12 RDEexperimentof5mMHQin1MKOHrecordedonaGCWE.. . . . . 56 4.13 RRDE experiment of 5 mM HQ in 1 M KOH recorded on GC and gold WEs. 57 4.14 RDE experiment of 5mM DHBQ in 1M KOH recorded on a GC WE. . . . 58 4.15 RRDE experiment of 5 mM DHBQ in 1 M KOH recorded on GC and gold WEs........................................ 59 4.16 Cyclic voltammograms of 5 mM DHTA in 1 M KOH recorded on a GC WE. 60 4.17 Bulk electrolysis of 10 mM DHTA in 1 M KOH recorded on a carbon mesh WE........................................ 61 4.18 Voltammograms of 4mM DHPA in 1M KOH recorded on a GC WE. . . . 62 4.19 Bulk electrolysis of 5 mM DHPA in 1 M KOH recorded on a carbon mesh WE........................................ 62PDF Image | Organic Redox Flow Batteries 2023
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