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Effects of Discharge Patterns and Pulse Width on Hydrogen Peroxide Formation by Pulsed Electrical Discharge in Water

Active species generated during the underwater discharge process play a pivotal role in the application fields. The electrical parameters including voltage amplitude and voltage pulse width make various contributions to the generation of active species. In this paper, we investigate the influences of discharge patterns (streamer and spark discharge) and voltage pulse widths on hydrogen peroxide (H2O2) generation. The experimental results show that the production rate and energy yield of H2O2 increases with the rise of applied voltage in streamer discharge region. While after spark discharges occur, the energy yield shows a saturated trend and the production rate even decreases in the spark discharge region. The increase of voltage pulse width also makes a positive contribution to improving the production rate of H2O2. While the energy yield of H2O2 production is independent on the variation of voltage pulse width. Besides, it is inferred that the generation of H2O2 mainly occurs during the wave tail time instead of rising time.