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Adams\n                    <jats:italic>et al.<\/jats:italic>\n                    studied the formation of hydrogen peroxide from hydrogen and oxygen on palladium nanoparticles by measuring the kinetic isotope effect and performing density functional theory simulations in aqueous and organic solvents. Methanol formed chemisorbed hydroxymethyl intermediates. These surface redox mediators transferred electrons and protons to adsorbed oxygen species and were regenerated by oxidizing chemisorbed hydrogen atoms. 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