Formation rates of hydrogen peroxide (H₂O₂) , hydrogen (H₂), and oxygen (O₂) in gliding arc discharge with water spray and a variety of carrier gases, including Ar, He, O₂, N₂, and CO₂, were determined. Significantly larger rates and concentrations of hydrogen peroxide were found in the present reactor with a modified liquid injection nozzle than in previous work. As long as nitrogen oxide species are minimized or not formed, the formation rates of hydrogen peroxide were less sensitive to the carrier gas (O₂, CO₂, Ar), although He gave about one-half the rate as these other gases. The stoichiometric ratios of H₂:O₂:H₂O₂ exhibited a range of behaviors for the different carrier gases with the highest H₂ formation rate in Ar and N₂ and the largest O₂ formation in CO₂.