The only difference between the two cases is the material used for the high-voltage needle electrodes.As shown in the figure, for nickel-chromium, the hydrogen and hydrogen peroxide production rates were stable (for hydrogen, an initial increase is observed, because of mixing effects) over the course of 60 min. The rate of hydrogen peroxide production is the slope of the line shown in Figure 1, converted to units of mol/s, and the rates of hydrogen and oxygen production are obtained from the concentrations shown in Figure 1, multiplied by the total gas flow rate and converted to units of mol/s.