Influence of Solution Conductivity on Contact Glow Discharge Electrolysis

Using a thin platinum anode in contact with an electrolytic solution, normal electrolysis develops spontaneously to contact glow discharge electrolysis (CGDE) at sufficiently high voltage. During this transition, midpoint voltage (V-D) is an important critical value. From V-D on, plasma is sustained by direct current glow discharge between the electrode and the electrolyte surface. And H2O2 is the main non-faradaic yield. In this study, effects of conductivity on V-D and the concentration of H2O2 have been investigated in Na2SO4 and NaCl solution. The results indicate that V-D decreases with the increasing conductivity. And the value of V-D and the concentration of H2O2 in NaCl solution are less than those in Na2SO4 solution. The concentration of H2O2 increases steadily and then decreases to maintain a stationary value.