Previous groups have proposed that hydrogen peroxide is generated at micromolar concentrations within aqueous microdroplets. Here, we develop an electrochemical method to directly probe peroxide within aqueous microdroplets. Using stochastic electrochemistry, we can observe hydrogen peroxide within micro- and nanodroplets at the single droplet level.  Given the low concentrations of peroxide potentially produced in droplets, we use a microdroplet array to amplify the signal by 3 orders of magnitude. These results yield insight into the spontaneous generation of hydrogen peroxide at phase boundaries.

Direct electrochemical detection of hydrogen peroxide in aqueous microdroplets

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