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Contents 3.6.2 EquivalentCircuits........................... 36 3.6.2.1 Three-Electrode Systems: Randles Circuit . . . . . . . . . 36 3.6.2.2 Flow Cells with Porous Electrodes: Transmission Line Model 38 3.6.3 Modelling ................................ 41 3.6.4 DataValidation............................. 42 4 Molecular Electrochemistry of Quinones 45 4.1 Experimental .................................. 45 4.2 ResultsandDiscussion ............................. 47 4.2.1 Ferri-andFerrocyanide......................... 49 4.2.2 Hydroxy-SubstitutedBenzoquinones ................. 54 4.2.2.1 HQ .............................. 54 4.2.2.2 DHBQ............................. 57 4.2.3 Carboxy-SubstitutedBenzoquinones ................. 59 4.2.3.1 DHTA............................. 59 4.2.3.2 DHPA............................. 60 4.2.4 Anthraquinones............................. 63 4.2.4.1 DHAQ............................. 63 4.2.4.2 PSAQ............................. 63 4.2.4.3 PPAQ(Na) .......................... 64 4.2.4.4 PPAQ(H) ........................... 65 4.2.4.5 DBEAQ............................ 65 4.3 SummaryandFinalRemarks ......................... 69 5 Cell Cycling 71 5.1 Experimental .................................. 71 5.2 ResultsandDiscussion ............................. 72 5.2.1 SymmetricCells............................. 72 5.2.2 FullCells ................................ 76 5.2.2.1 DHAQagainstFerrocyanide................. 76 5.2.2.2 PPAQ(Na)againstFerrocyanide . . . . . . . . . . . . . . 82 5.2.2.3 DBEAQagainstFerrocyanide................ 82 5.3 SummaryandFinalRemarks ......................... 86 6 Electrochemical Impedance of Single Flow Cells 87 6.1 Experimental .................................. 87 6.1.1 ModificationstotheSetup....................... 88 6.2 ResultsandDiscussion ............................. 90 6.2.1 InfluenceofExperimentalConditions................. 90 6.2.1.1 CellHardwareandElectrodes................ 90 6.2.1.2 Membranes .......................... 95 6.2.1.3 PulsationDampening .................... 96 6.2.1.4 Temperature ......................... 97 6.2.1.5 pHEquilibration .......................101 6.2.2 Influence of Flow Rate on the Electrochemical Impedance of Sym- metric Cells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 6.2.2.1 Ferri-/Ferrocyanide......................103 6.2.2.2 DHAQ.............................106 6.2.2.3 DBEAQ............................109 xviPDF Image | Organic Redox Flow Batteries 2023
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