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4.20 Cyclic voltammograms and Randles-Ševčík plot of 2mM DHAQ in 1M KOHrecordedonaGCWE........................... 63 4.21 Cyclic voltammograms of 5 mM PPAQ(Na) in 1 M KOH recorded on a GC WEatvariousscanrates. ........................... 64 4.22 RDE experiment of 5 mM PPAQ(H) in 1 M KOH recorded on a GC WE. . 66 4.23 RDE experiment of 2.5 mM DBEAQ in 1 M KCl+0.01 MKOH recorded on aGCWE..................................... 67 5.1 Galvanostatic symmetric cell cycling of 0.2M K3[Fe(CN)6]/K4[Fe(CN)6]. . 73 5.2 Potentiostatic symmetric cell cycling of 10 mL 0.2 M K3[Fe(CN)6]/K4[Fe(CN)6]. 74 5.3 Galvanostatic symmetric cell cycling of 0.2M K3[Fe(CN)6]/ K4[Fe(CN)6] withaCLS.................................... 75 5.4 Potentiostatic cell cycling of 0.1 M/0.1 M K3[Fe(CN)6]/K4[Fe(CN)6] with a CLS........................................ 76 5.5 Galvanostatic cell cycling of 0.267 M DHAQ against 0.4 M K4[Fe(CN)6] in 1.0MKOH.................................... 78 5.6 Polarisation and power density curves of 0.2 M DHAQ against 0.4 M K4[Fe(CN)6] in1.0MKOH................................... 79 5.7 Galvanostatic cell cycling of 0.2 M DHAQ against 0.4 M K4 [Fe(CN)6 ] in 1.0MKOHwithpotentialholdsatthevoltagelimits. . . . . . . . . . . . . 80 5.8 Galvanostatic cell cycling of 0.2 M DHAQ against 0.4 M K4 [Fe(CN)6 ] in 1.0MKOH.................................... 81 5.9 Galvanostatic cell cycling of 0.2 M PPAQ(Na) against K4[Fe(CN)6] in 1.0 M. 83 5.10 Polarisation and power density curves of 0.1M DBEAQ against 0.15M K4[Fe(CN)6]+0.05MK3[Fe(CN)6]........................ 84 5.11 Galvanostaticcellcyclingof0.1MDBEAQagainst0.15MK4[Fe(CN)6]+0.05M K3[Fe(CN)6]atpH12. ............................. 85 6.1 Schematic of the final version of the one-container symmetric cell setup usedforEISstudies. .............................. 89 6.2 Nyquist plots and resistances of dry cells assembled with a varying number of pristine or pretreated Sigracet 39AA carbon papers and tightened with differenttorques. ................................ 91 6.3 Nyquist plots and resistances of dry cells assembled with pristine or pre- treated 1186HCBA carbon cloths and tightened with different torques. . . 91 6.4 Linear potential sweeps recorded on cells assembled with either pristine or pretreated Sigracet 39AA carbon papers and flooded with 1 M KCl. . . . . 92 6.5 Photographs of the electrode materials used in this work in pristine and pretreatedform.................................. 93 6.6 Nyquist plots recorded on cells assembled with pristine or pretreated Sigracet 39AA papers or 1186HCBA cloths and flooded with blank electrolyte. . . . 94 6.7 Linear potential sweeps recorded on cells assembled with either pristine or pretreated 1186HCBA carbon cloths and flooded with 1M KCl adjusted topH12. .................................... 94 6.8 Nyquist plots recorded on cells assembled with Sigracet 39AA papers, Nafion 212 membranes subjected to various pretreatments as stated in the legends,andfloodedwith1MKCladjustedtopH12.. . . . . . . . . . . . 96 List of Figures 129PDF Image | Organic Redox Flow Batteries 2023
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