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• W3185980610 abstract "Recently, experimental and theoretical works have reported evidence indicating that photochemical processes may significantly be accelerated at heterogeneous interfaces, although a complete understanding of the phenomenon is still lacking. We have carried out a theoretical study of interface and surface effects on the photochemistry of hydrogen peroxide (H2O2) using high-level ab initio methods and a variety of models. Hydrogen peroxide is an important oxidant that decomposes in the presence of light, forming two OH radicals. This elementary photochemical process has broad interest and is used in many practical applications. Our calculations show that it can drastically be affected by heterogeneous interfaces. Thus, compared to gas phase, the photochemistry of H2O2 appears to be slowed on the surface of apolar or low-polar surfaces and, in contrast, hugely accelerated on ionic surfaces or the surface of aqueous electrolytes. We give particular attention to the case of the neat air-water interface. The calculated photolysis rate is similar to the gas phase, which stems from the compensation of two opposite effects, the blue shift of the n→σ* absorption band and the increase of the absorption intensity. Nevertheless, due to the high affinity of H2O2 for the air-water interface, the predicted OH production rate is up to five to six orders of magnitude larger. Overall, our results show that the photochemistry of H2O2 in heterogeneous environments is greatly modulated by the nature of the surface, and this finding opens interesting new perspectives for technological and biomedical applications, and possibly in various atmospheres." @default.
• W3185980610 created "2021-08-02" @default.
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• W3185980610 date "2021-07-21" @default.
• W3185980610 modified "2023-10-14" @default.
• W3185980610 title "Tight electrostatic regulation of the OH production rate from the photolysis of hydrogen peroxide adsorbed on surfaces" @default.
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• W3185980610 doi "https://doi.org/10.1073/pnas.2106117118" @default.
• W3185980610 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8325346" @default.
• W3185980610 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34290148" @default.
• W3185980610 hasPublicationYear "2021" @default.
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