A Flower-cluster Heterogenous Structure Assembled by Ultrathin NiCo/NiCoOx-SiO2 Nanobelts with Stable Catalytic Performance

Abstract Ultrathin two-dimensional heterogeneous structural with large specific surface area have abundant interface defects and changed surface state, which provides a mass of active sites. This novel structure can obviously enhance catalytic performance and have received researcher’s attention. Herein, a tactful way has been explored to synthesize a flower-cluster heterogenous structure NiCo/NiCoOx-SiO2 assembled by ultrathin nanobelts through coordination controlling coprecipitation in hydrothermal system followed by H2 in-situ reduction. NiCo alloy nanophase uniformly dispersed on the stable ultrathin NiCoOx-SiO2 nanobelts. Based on the favorable reactant transmission of the flower-clustered ultrathin 2D heterogeneous structure and the stabilized NiCo active sites via strong interaction with NiCoOx-SiO2, the as-obtained NiCo/NiCoOx-SiO2 nanocatalyst shows excellent stable catalytic performance,which allows over 25 recycles without obvious performance decay for the amination of p-nitrophenol and maintaining 100% conversion even after 7 days for CO oxidation reaction at 400 °C. This work provides a new way to construct a stable, non-noble metal ultrathin heterostructure nanocatalyst with superior catalytic degradation performance of environmental pollutants for the requirement of green chemistry.