Electrocatalytic H2O2 production via two-electron O2 reduction by Mo-doped TiO2 nanocrystallines†
Electrochemical synthesis of H2O2via a selective two-electron O2 reduction reaction (2e− ORR) is an attractive alternative to the industrial anthraquinone oxidation method. Herein, Mo doping is proposed as an effective strategy to boost 2e− ORR of the TiO2 nanocrystallines, which not only improves the electrical conductivity of TiO2 but also reduces the *OOH adsorption energy of active sites. Such Mo–TiO2-2 achieves a high Faradaic efficiency of 92% and a large H2O2 yield of 395.3 mmol gcat−1 h−1 in 0.1 M KOH. The catalytic mechanism is further revealed via density functional theory calculations.