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Figure S7 shows that increasing the HCl concentration from 1 M to 5 M reduces the formal potential to evolve Cl2 by ~50 mV. This figure considers a solution of only HCl (without H2SO4), however, it still informs how gas evolution will be affected by the MA electrolyte which contains 5 M HCl. At high Cl2 partial pressures, 1 M HCl gives the 1.359 V vs SHE value that is often used for the 2Cl-/Cl2 reaction potential. In a 5 M HCl solution, the gas evolution potential is closer to 1.31 V vs SHE. Also, the partial pressure of Cl2 above the electrolyte impacts the potential of gas evolution significantly for both cases. The potential for both the 1 M and 5 M solutions varies by 50 mV over the linear region of the plot (0.1 to 0.6 atm). At Cl2 pressures below 0.1 atm, the formal potential starts to decrease rapidly, which would enable the onset of gas generation at even lower voltages. Figure S7: Influence of HCl concentration on 2Cl-/Cl2 formal potential, as calculated by Equation 4. 25PDF Image | Chlorine Gas Generation in Mixed-Acid Vanadium Redox
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