Surface‐Integrating Oxygen Vacancy and CuxO Nanodots Enabling Synergistic Electric Field and Dual Catalytic Sites Boosting CO2 Photoreduction

Abstract High carrier separation efficiency and rapid surface catalytic reaction are crucial for enhancing catalytic CO 2 photoreduction reaction. Herein, integrated surface decoration strategy with oxygen vacancies (Ov) and anchoring Cu x O (1 < x < 2) nanodots below 10 nm is realized on Bi 2 MoO 6 for promoting CO 2 photoreduction performance. The charge interaction between Ov and anchored Cu x O enables the formation of enhanced internal electric field, which provides a strong driving force for accelerating the separation of photocharge carriers on the surface of Bi 2 MoO 6 ( η surf ≈71%). They can also cooperatively reduce the surface work function of Bi 2 MoO 6 , facilitating the migration of carrier to the surface. Meanwhile, surface‐integrated Ov and Cu x O nanodots allowing dual catalytic sites strengthens the adsorption and activation CO 2 into *CO 2 over Bi 2 MoO 6 , considerably boosting the progression of CO 2 conversion process. In the absence of co‐catalyst or sacrificial agent, Bi 2 MoO 6 with Ov and Cu x O nanodots achieves a photocatalytic CO generation rate of 12.75 µmol g −1 h −1 , a remarkable increase of over ≈15 times that of the original counterpart. This work provides a new idea for governing charge movement behaviors and catalytic reaction thermodynamics on the basis of synergistic improvement of electric field and active sites by coupling of the internal defects and external species.