Alcohol‐Regulated H 2 O 2 Formation in O 2 ‐Containing Gas–Liquid Discharge Plasma
Bohan Chen, Zhuo Li, Baolin Yu, Runhao Gao, Zirui Min, Shuai Yuan, Tianyu Li, Renwu Zhou, Rusen Zhou, Dingxin LiuABSTRACT
Hydrogen peroxide formation in gas–liquid discharge plasma is usually associated with the recombination of plasma‐generated hydroxyl radicals (•OH). Although alcohols are commonly regarded as •OH scavengers and are therefore expected to inhibit peroxide formation, their effects in plasma–liquid environments remain poorly understood. Here, methanol was used as a model alcohol to study alcohol‐regulated H 2 O 2 formation in an O 2 ‐containing bubble plasma system. Low methanol volume fractions markedly enhanced H 2 O 2 accumulation, whereas excessive methanol caused early saturation and reduced sustained peroxide production. H 2 O 2 formation also showed a non‐monotonic dependence on O 2 fraction, indicating the need to balance methanol content and O 2 availability. OES, electron‐density analysis, and ESR measurements revealed that alcohols regulate plasma‐induced H 2 O 2 formation by coupling plasma excitation with liquid‐phase radical chemistry, rather than simply acting as hydroxyl radical scavengers.