Construction and catalytic properties of two-dimensional NiCoPt/NiCo nanocomposites

The design and construction of highly efficient and stable heterogeneous catalysts for hydrogenation of toxic and refractory aromatic nitro compounds into valuable aromatic amino compounds is of great significance for reducing environmental pollution and realizing green chemistry. In this study, a NiCoPt/NiCo nanocomposite with NiCoPt ternary alloy particles uniformly dispersed on NiCo ultra-thin nanosheets was designed and synthesized by semi-permeable membrane template method. In this composite system, the synergistic effect of alloys was utilized to adjust the electronic structure of precious metal Pt by adjusting the composition and proportion of the alloys, and the dispersion of Pt was achieved on the atomic scale. On this basis, two-dimensional NiCo nanosheets were used as carriers to further disperse nanoalloy particles, which not only improved the utilization rate of the alloy, but also promoted the transfer of charges between the two interfaces, thereby achieving effective improvement in catalytic reaction activity. The optimized catalyst could catalyze the reduction of p-nitrophenol to p-aminophenol with high efficiency within 30 s, with the reaction rate constant of 0.1033 s^–1, and no obvious performance attenuation after 12 cycles.