Rapid activation of Co3O4 cocatalysts with oxygen vacancies on TiO2 photoanodes for efficient water splitting

Herein, we demonstrate a rapid and highly efficient strategy for rationally constructing oxygen vacancies on Co₃O₄ cocatalysts by Ar-plasma treatment, and the photocurrent density could be achieved up to 2.5 mA cm⁻² (1.23 V_RHE) under AM 1.5G irradiation (100 mW cm⁻²).