Charge-enriched RuO2 nanoparticles decorating TiO2 with Ti defects to promote oxygen evolution reaction in acidic media

Dispersing precious metal oxide nanoparticles on a support is a promising catalyst modification strategy for the oxygen evolution reaction in acidic media, but the rational design of the heterointerface remains challenging. Herein, electron-rich ruthenium dioxide dispersed on the metal-deficient TiO2 is constructed as an efficient electrocatalyst for oxygen evolution. The combination with defective support triggers the charge transfer from the support to RuO2, which optimizes the adsorption/desorption of oxo-intermediates and thus improves the kinetics of the OER reaction. Moreover, the large electron filling in the support, as an auxiliary, accelerates the deprotonation of oxo-intermediates during the acidic OER. As a result, the improved d-TiO2/RuO2 showed excellent OER activity, with an overpotential of 226 mV @10 mA cm(-2) in 0.5 M H2SO4, which was superior to that of commercial RuO2. This study provides an ideal defective support for unique heterojunction catalysts and highlights the development of noble metal catalysts with low cost.