Construction of Bi/Bi

The ternary Bi/Bi2S3/TiO2 (BST) heterojunction was successfully fabricated through integration of the hydrothermal method combined with thermal calcination. TiO2 nanosheets serves as the host for the in situ deposition of Bi2S3 and Bi nanoparticles, and the tight interface with the heterojunction favors efficient charge transfer. Bi2S3 with a narrow band gap characteristic enables UV-visible-infrared full-spectrum absorption, and metallic Bi with a surface plasmon resonance (SPR) effect generating hot electron injection can effectively transfer and separate photogenerated charge carriers. The BST catalyst shows a broad-spectrum response and excellent photothermal effect, which could absorb near-infrared energy and improve the CO2 reduction performance. Furthermore, the surface temperature of the BST composite reaches 109.0 °C within 10 min, exhibiting an excellent photothermal catalytic CO production rate of 175.94 μmol g-1 h-1 at 70 °C, which is ∼6.5 times higher than that of pristine TO2. The excellent photocatalytic performance can be ascribed to the unique ternary heterojunction structure with suitable band gap structure. Localized heating not only accelerates carrier migration but also thermally activates CO2 adsorption. This work advances the design of full-spectrum-driven photothermal catalytic systems for the efficient catalytic conversion of CO2.