Significant boosting effect of single atom Pt towards the ultrasonic generation of H2O2: A two-way catalytic mechanism

Single atom Pt was anchored on the surface of SiO 2 (Pt 1 /SiO 2 ) with the assistance of ionic liquid. It was found that Pt 1 (0.1 %)/SiO 2 could catalyze to sonically generate 3027.1 µmol L −1 h −1 H 2 O 2 , being 25.2 folds and 11.6 folds of those from pure ultrasound and sonocatalytic processes of Pt n (0.1 %)/SiO 2 , respectively. It was also the maximum concentration of H 2 O 2 generated by sonocatalysis so far. The significant boosting effect of Pt 1 was attributed to the synergetic role of its two-way catalytic processes proved by isotope labeling and DFT calculation. Firstly, Pt 1 catalyzed the sono-splitting of H 2 O to generate •OH as the precursor of H 2 O 2 formation by increasing the adsorption energy of H 2 O; Secondly, it catalyzed the combination of O 2 and •H to selectively generate •OOH as another precursor of H 2 O 2 by one end-on type adsorption of O 2 on Pt 1 . These findings provided a new way to enhance the ultrasonic generation of H 2 O 2 .