Hydrogen peroxide (H
2O
2) formation on Ketjen blackR EC300J, Vulcan XC-72R® and acetylene black in sulfuric acid solution was investigated. For this purpose, an ultra-microanalysis system for H
2O
2 was constructed. It was clarified that H
2O
2 was produced through an oxygen reduction reaction on these carbon materials. When oxidized acetylene blacks were employed, both the content of alcohol-like groups and the amounts of H
2O
2 produced increased. It is, therefore, surmised that the alcohol-like groups on acetylene blacks mainly contribute to H
2O
2 formation in a similar manner as the so-called “anthraquinone process”, the practical method for H
2O
2 production.
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