Construction of COFs@MoS₂-Pd Hierarchical Tubular Heterostructures for Enhanced Catalytic Performance

Here, we report ternary COFs@MoS₂-Pd hybrids with an innovative self-sacrificial approach. MoO₃@Covalent organic frameworks (COFs) microcables were first prepared and then two-dimensional MoS₂ nanosheets (NSs) were integrated onto the surface of COFs, as COFs@MoS₂, after treatment with hydrothermal reaction. The MoS₂ NSs were used as an excellent support to introduce Pd nanoparticles (NPs) thanks to their reducing ability for the formation of the ternary COFs@MoS₂-Pd hybrids. While COF microtubes improved the electrical conductivity of the hybrid materials, they also decreased the aggregation of MoS₂ NSs, as a contribution to the enhanced catalytic performance. The mild reaction between MoS₂ and Pd²⁺ ions realized the dense distribution of Pd NPs onto COFs@MoS₂ for abundant active sites to further improve the catalytic performance. Thus, the hierarchical MoS₂-based ternary hybrids were prepared with the enhanced catalytical performance as validated with the enzyme-like catalysis and the reduction of 4-nitrophenol.