Novel iodide-modified bismuth molybdate quantum dot/monolayer graphene (0D/2D) heterojunction for efficient photothermal catalytic reduction of CO2

The main influencing factor in photothermal catalytic reduction of CO 2 is carrier migration limitation. To further enhance the carrier transport rate, iodide-modified Bi 2 MoO 6 quantum dots (BMO QDs) were constructed and deposited on a monolayer of reduced graphene oxide surface (rGO) to construct a BMO-I QDs/rGO heterojunction . Quantum dots have short carrier migration distances due to their ultra-small bulk phase thickness, allowing carrier migration to occur quickly and electron-hole complexation to be reduced. rGO heterojunction can promote the formation of thin stacked structures in BMO-I QDs and a photothermal conversion temperature of 74. 6 °C. The rGO and BMO-I QDs can form a C–I–Bi interfacial electron bridge, and the I - playing transport channel provides a bridge for carrier interfacial transport, which enables the electrons in the BMO QDs to migrate to the surface of the rGO, formation of an electron cloud on the rGO for rapid catalytic reduction of CO 2 , and the CO production on BMO-I QDs/5rGO was 2.02 times higher than that on BMO-I QDs. The construction of heterojunctions is demonstrated to accelerate CO 2 cleavage and CO desorption by DFT calculations of CO 2 adsorption, electronic energy band structure and density of states.