In Situ Construction of Co-MoS 2 /Pd Nanosheets on Polypyrrole-Derived Nitrogen-Doped Carbon Microtubes as Multifunctional Catalysts with Enhanced Catalytic Performance.

The structural design of multiple functional components could integrate synergistic effects to enhance the catalytic performance of MoS 2 -based composites for catalytic applications. Herein, one-dimensional (1D) Co-MoS 2 /Pd@NCMTs composites were designed to prepare Co-doped MoS 2 /Pd nanosheets (NSs) on N-doped carbon microtubes (NCMTs) from tubular polypyrrole (PPy) as multifunctional catalysts. The Co-MoS 2 /Pd@NCMTs composites integrated the synergistic effects of Co-doping, a 1D tubular structure, and noble-metal Pd decoration. Thus, a higher catalytic activity was observed in 4-nitrophenol (4-NP) reduction and peroxidase-like catalysis than other components, such as MoS 2 , MoS 2 @NCMTs, and Co-MoS 2 @NCMTs. Remarkably, the results indicated that the dissolution, diffusion, and redistribution led to the dissolution of MoO 3 @ZIF-67 cores and generation of Co-doped MoS 2 NSs. Benefiting from the synergistic effect from these components, Co-MoS 2 /Pd@NCMTs were considered as a facile colorimetric sensing platform for detecting tannic acid. Moreover, outstanding performance was realized in the reduction of 4-NP with the composites. Thus, we provide a simple synthetic strategy for simultaneously integrating electronic engineering and structural advantages to develop an efficient MoS 2 -based multifunctional catalyst.