In Situ Construction of Co-MoS₂/Pd Nanosheets on Polypyrrole-Derived Nitrogen-Doped Carbon Microtubes as Multifunctional Catalysts with Enhanced Catalytic Performance

Abstract

The structural design of multiple functional components could integrate synergistic effects to enhance the catalytic performance of MoS2-based composites for catalytic applications. Herein, one-dimensional (1D) Co-MoS2/Pd@NCMTs composites were designed to prepare Co-doped MoS2/Pd nanosheets (NSs) on N-doped carbon microtubes (NCMTs) from tubular polypyrrole (PPy) as multifunctional catalysts. The Co-MoS2/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 MoS2, MoS2@NCMTs, and Co-MoS2@NCMTs. Remarkably, the results indicated that the dissolution, diffusion, and redistribution led to the dissolution of MoO3@ZIF-67 cores and generation of Co-doped MoS2 NSs. Benefiting from the synergistic effect from these components, Co-MoS2/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 MoS2-based multifunctional catalyst.

Facile strategy for the synthesis of silver nanoparticles on magnetic Fe3O4@C core–shell nanocomposites and their application in catalytic reduction

“…S2,† the Fe 3 O 4 @C-Ag composite possesses similar textural properties (type-IV isotherm, H2 hysteresis) characteristic of the mesoporous structure. 31,32 The BET specific surface area of Fe 3 O 4 @C-Ag (1 : 1), Fe 3 O 4 @C-Ag (1 : 2), and Fe 3 O 4 @C-Ag (1 : 3) were found to be 106.21, 83.59 and 99.24 m 2 g −1 , respectively, whereas their surface areas and average pore diameters are summarized in Table S2 †. The high surface area of the Fe 3 O 4 @C-Ag composite is the result of the presence of a carbon shell, which helps to reduce the agglomeration of Fe 3 O 4 and Ag NPs, thus freeing the void space among particles.…”

Coupled nickel–cobalt nanoparticles/N,P,S-co-doped carbon hybrid nanocages with high performance for catalysis and protein adsorption

“…It is well known that 4-aminophenol (4-AP) is very useful and important in many applications including drugs, photographic developers, corrosion inhibitors, anticorrosion-lubricants etc . 54–56 The catalytic reduction of 4-NP to 4-AP is often used to probe the reaction to test the catalytic activity of metal NPs in aqueous solution. 57 Therefore, the reduction of 4-NP to 4-AP with an excess amount of NaBH 4 was used as a model system to quantitatively evaluate the catalytic activities of the resultant NiCo@NPSC composites.…”

Facile fabrication of ultrafine CoNi alloy nanoparticles supported on hexagonal N-doped carbon/Al2O3 nanosheets for efficient protein adsorption and catalysis

“…In the absence of C-CoNi/Al 2 O 3 , the aqueous mixture of 4-nitrophenol and NaBH 4 shows a bright yellow color, which corresponds to 4-nitrophenolate ions under alkaline conditions. 30,48,49 The bright yellow color remains unaltered with time, which suggests that the reduction does not proceed without the presence of the C-CoNi/Al 2 O 3 catalyst. However, after the addition of C-CoNi/Al 2 O 3 , the yellow color of the reaction mixture is fading and ultimately bleaching in quick succession.…”