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Chapter 4. Molecular Electrochemistry of Quinones 68 Table 4.1: Experimentally determined diffusion and kinetic parameters for the investigated compounds. The results from DHTA and DHPA voltammetry (see Figures 4.16 and 4.18) are not tabulated, as they display more complex electrochemistry with multiple processes. The following supporting electrolytes were used to achieve the shown pH values: 1M H2SO4 for pH 0, 1M Na2SO4 for pH 7, 1M KCl+0.01 M KOH for pH 12, and 1 M KOH for pH 14. RS = Randles-Ševčík. (a) 3.0 M NaCl filling solution; (b) 3.4 M KCl filling solution; (c) 1.0 M NaOH filling solution. Species State c∗ WE [mol cm−3] RE pH E1/2 [V] vs. SHE DOx/DRed (RS) [cm2 s−1] D (Levich) [cm2 s−1] k0 (Tafel) [cm s−1] α (Tafel) [unitless] [Fe(CN)6]3– [Fe(CN)6]3– [Fe(CN)6]4– [Fe(CN)6]4– Ox 5mM GC Ag/AgCl(a) Ag/AgCl(b) Ag/AgCl(b) Hg/HgO(c) 7 0.482 12 0.469 12 0.475 14 0.519 1.78 × 6.23 × 10−6 /1.08 NA NA × 10−6 × 10−6 4.71 × 10−6 6.91 × 10−6 6.02 × 10−6 NA 4.21 × 10−3 3.73 × 10−3 3.23 × 10−3 NA 0.390 0.429 0.412 NA HQ Red 1mM GC Red 5mM GC Ox 5mM GC Ag/AgCl(a) Hg/HgO(c) Ag/AgCl(a) 0 0.700 14 "0.056" 14 −0.692 2.67 × × 10−6 7.30 × 10−6 5.82 × 10−6 5.61 × 10−6 1.13 × 10−3 NA 6.25 × 10−4 0.558 NA 0.152 HQ DHBQ NA NA DHAQ PSAQ PPAQ(Na) PPAQ(H) DBEAQ DBEAQ Ox 2mM GC Ox 1mM GC Ox 5mM GC Ox 5mM GC Ox 2.5 mM GC Ox 2.5 mM Au Hg/HgO(c) Ag/AgCl(a) RHE Hg/HgO(c) Ag/AgCl(b) Ag/AgCl(b) 14 −0.670 14 −0.537 10−6 /1.55 2.77 × 10−8 /2.34 × 10−8 NA NA NA NA NA Ox 5mM GC Red 5mM GC Red 4mM GC 10−7 /1.28 10−6 /4.46 × 10−6 0 0.093 NA NA NA NA 14 −0.500 12 −0.509 12 −0.507 NA NA NA 2.19 × 10−6 2.58 × 10−6 2.61 × 10−6 8.40 × 10−3 3.43 × 10−2 2.50 × 10−2 NA 0.123 0.122 0.098 1.15 ×PDF Image | Organic Redox Flow Batteries 2023
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