Construct 3D Pd@MoS2-conjugated polypyrrole framworks Heterojunction with unprecedented photocatalytic activity for Tsuji-Trost reaction under visible light

Abstract

Site-selective coupling of two photochemical system and one electron-transfer system to realize efficient charge separation and light absorption affords a promising route to enhance the photocatalytic efficiencies of semiconductors. To date, however, how to develop 3D porous multicomponent heterojunction systems for solar energy conversion in the visible and near-infrared (NIR) light region still remains a significant challenge. Here we report a simple technique for forming 3D Pd@MoS2-conjugated polypyrrole framworks (Pd@MoS2CPFs), in which two visible-light-active components (MoS2 nanosheets and polypyrrole) and the electron-transfer system (Pd) are spatially fixed, and the uniform Pd NPs are anchored in the MoS2CPFs. This 3D porous system exhibits good structural stability, high pore volume (0.31 cm3 g−1), high surface area (105.24 m2/g), improved light absorption, and a long living electron-hole pair at the Pd@MoS2CPFs interface. Unexpectedly, we first found that the formed Pd@MoS2CPFs exhibited excellent photocatalytic activity and long-term stability for the direct Tsuji-Trost reaction between allylalcohol and 1,3-dicarbonyl under visible light at room temperature, far exceeding those of the single- and two-component systems, as a result of vectorial electron transfer driven by the one-step excitation of polypyrrole and MoS2. These results provide a promising new avenue in the design and fabrication of unique 3D porous multicomponent heterojunction for visible-light-induced efficient artificial photosynthetic systems.