fig4

Figure 4. Synthesis of H₂O₂ in microdroplet systems. (A) Proposed mechanism to form H₂O₂ at the air-water interface of microdroplets^[31]; (B) Fluorescence imaging of spontaneous generation of hydrogen peroxide in aqueous microdroplets^[31]; (C) Dependence of H₂O₂ generation on the surface OH groups on the SiO₂ substrate^[35]; (D) DFT calculations of photocatalytic H₂O₂ production^[37]. Figure 4A and B is reprinted with permission from Ref.^[31], available under a CC BY-NC-ND 4.0. Figure 4C is reprinted with permission from Ref.^[35], available under a CC BY-NC-ND 4.0. Figure 4D is reprinted with permission from Ref.^[37], with permission from the Royal Society of Chemistry. DFT: Density functional theory.