Abstract
Using an aqueous solution of NaCl as the cathode, we explored the atmospheric pressure Ar discharge plasma generated above the solution surface. The formation pathways of aqueous hydrogen peroxide (H2O2aq) in this system were investigated. Dimethyl sulfoxide was used as a scavenger of hydroxyl (OH) radicals to investigate the contribution of dissolved OH radicals to the H2O2aq. The results indicate that the H2O2aq is mainly formed by the combination of the dissolved OH radicals at the plasma-affected thin liquid layer, while the H2O2 formed in the gas phase and the H2O2aq formation inside water by the plasma-induced ultraviolet radiation have no contribution.
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