Fig. 7. Voltage evolution over time in an electrochemical HI decomposition experiment for three I₂/HI ratios is shown for (a) 1, (b) 0.5, and (c) 0.25 with HI and H₂SO₄ as the catholyte. The hydrogen moles collected over time are shown for the two current densities for (d) HI and (e) H₂SO₄, respectively.