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7.3.4.2 Enhanced carbon-based electrodes 7.3.4.2.1 Sodium 4,5-dihydroxybenzene-1,3- disulfonate (+) vs. anthraquinone 2,7- Disulfonic acid disodium salt (-) Finally, once the studies of the quinones molecules, following three different approaches, have been done to obtain the best possible combination, it is continued its development including the treated electrodes previously verified into half-cell systems. CF-HT is included as positive electrode using 4,5-dihydroxybenzene-1,3- disulfonate (1,2-BQDS) active material, analogously CF-rGO/Q electrode is implemented as negative electrode using anthraquinone 2,7- Disulfonic acid disodium salt (2,7-AQDS) negative active material. In Both cases methanosulfonic acid is used as solvent. a) 0 -20 -40 -60 b) 60 40 20 0.3 M 1,2-BQDS (+) and 2,7-AQDS (-) 0.05 M 1,2-BQDS (+) and 2,7-AQDS (-) -Im(Z) / Ohm j / mA/cm2 2.0 1.5 1.0 0.5 0.0 0.0 0.5 1.0 1.5 2.0 Re(Z) / Ohm 0.0 0.4 0.05 M 1,2-BQDS (+) and 2,7-AQDS (-) 0.3 M 1,2-BQDS (+) and 2,7-AQDS (-) E /V 0.8 1.2 Figure 7.43. – a) Cyclic voltammetry for the single cell in a potential range from 0 to 1.2 V, using GF-N as positive electrode and GF-rGO/Q as negative electrode containing an electrolyte of 0.05 M 1,2-BQDS(+) and 2,7-AQDS in 3 M MeSO3H solution (red line) and 0.3 M 1,2-BQDS(+) and 2,7-AQDS in 3 M MeSO3H solution (black line). b) PEIS for the single cell at a fixed potential of 0 V vs. NHE, using GF-N as positive electrode and GF-rGO/Q as negative electrode containing an electrolyte of 0.05 M 1,2-BQDS(+) and 2,7-AQDS in 3 M MeSO3H solution (red line) and 0.3 M 1,2-BQDS(+) and 2,7-AQDS in 3 M MeSO3H solution (black line). 199PDF Image | Redox Flow Batteries Vanadium to Earth Quinones
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