Single atomic Ru in TiO2 boost efficient electrocatalytic water oxidation to hydrogen peroxide

Electrocatalytic two-electron water oxidation affords a promising approach for distributed production of H 2 O 2 using electricity. However, it suffers from the trade-off between the selectivity and high production rate of H 2 O 2 due to the lack of suitable electrocatalysts . In this study, single atoms of Ru were controllably introduced into titanium dioxide to produce H 2 O 2 through an electrocatalytic two-electron water oxidation reaction. The adsorption energy values of OH intermediates could be tuned by introducing Ru single atoms , offering superior H 2 O 2 production under high current density . Notably, a Faradaic efficiency of 62.8% with an H 2 O 2 production rate of 24.2 μmol min −1 cm −2 (>400 ppm within 10 min) was achieved at a current density of 120 mA cm −2 . Consequently, herein, the possibility of high-yield H 2 O 2 production under high current density was demonstrated and the importance of regulating intermediate adsorption during electrocatalysis was evidenced.