In-Situ Synthesis Of Wo3-X/Moo3-X Heterojunction With Abundant Oxygen Vacancies For Efficient Photocatalytic Reduction Of Co2

Photocatalytic conversion of CO2 into valuable fuels is considered to be a promising approach for developing renewable and sustainable energy. However, due to poor light harvesting, low charge-separation efficiency and insufficient reaction sites on the surface of photocatalyst, the overall conversion efficiency is facing great challenges. Herein, we reported a novel WO3-x/MoO3-x heterojunction photocatalyst with abundant oxygen vacancies via a facile in-situ solvothermal process to tackle all of the aforementioned issues. Due to the well-matched band gap between WO3-x and MoO3-x, the resultant WO3-x/MoO3-x heterojunction can not only extend the optical response to overlap the NIR region, but also greatly promote the separation of electron-hole pairs. Meanwhile, the improvement of specific surface area and the creation of surface oxygen vacancies endow WO3-x/MoO3-x heterojunction with enhanced CO2 adsorption and activation capacities. As a result, WO3-x/MoO3-x heterojunction exhibits a significant improvement in the photoreduction activity of CO2. And its CO productivity is 40.2 mu mol.g(-1).h(-1), which is 9.5 times higher than that of the pristine MoO3-x nanosheet. This strategy might provide a novel way to improve the comprehensive performance of photocatalysts and develop renewable energy sources.