Dissolved Oxygen Redox as the Source of Hydrogen Peroxide and Hydroxyl Radical in Sonicated Emulsive Water Microdroplets

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown

Published: March 25, 2025

Sonicated emulsive water microdroplets (SEWMs) accelerate and enable a variety of catalyst-free chemical transformations. However, significant unanswered questions remain regarding the intermediates they form their possible redox origin. In this study, we identified dissolved O2 as primary originator reactive oxygen species (ROS) such OH• H2O2. We uncovered role by using combination microelectrochemical methods to detect H2O2, isotopic identify source electron spin resonance DMPO trap radicals OH•. Notably, found that H2O2 production is correlated with content via reduction pathway enabled sufficiently large reducing power can additionally generate H2 even perform Pb electroless deposition on Au Cu metal substrates. Building our findings, continuous bubbling SEWMs showed accumulation up ∼88 mM in aqueous phase within 1 h sonication, demonstrating scale-up promise method. Distinct sonochemistry single phase, study advances understanding confluence reaction mechanisms biphasic system. This insight paves way for improving kinetics, yield, selectivity, positioning these attractive microreactors alternatives traditional electrolyzers.

Language: Английский

Scanning Electrochemical Microscopy: An Evolving Toolbox for Revealing the Chemistry within Electrochemical Processes

Analytical Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: April 7, 2025

Language: Английский