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Recent reports on the spontaneous formation of H2O2(aq) at the air-waterinterface and the solid-water interface have been sensational. The speculatedmechanism at the air-water interface is based on instantaneous ultrahighelectric fields and the micro-scale of droplets, whereas the solid-waterinterface is speculated to be the site for oxidation of water (or hydroxideions) and reduction of the solid surface. We utilized 1H-NMR spectroscopy toinvestigate the effects of the nebulizing gas, the dissolved oxygen content,and solid substrates on the H2O2(aq) formation (detection limit 50 nM).Experiments revealed that contrary to the sensational claims, the air-waterinterface is not the site for H2O2(aq) formation; instead, it is thesolid-water interface where H2O2(aq) is formed during the reduction ofdissolved oxygen and oxidation of the solid surface. Curiously, the tendenciesof solid substrates towards forming H2O2(aq) follow the classic Galvanicseries. This report advances the current understanding of aquatic chemistry andshould be relevant to corrosion science, surface science, and electrochemistry.

Busting the Myth of Spontaneous Formation of H2O2 at the Air-Water  Interface: Contributions of the Liquid-Solid Interface and Dissolved Oxygen  Exposed