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.

中文翻译：

---

由超薄NiCo/NiCoOx-SiO2纳米带组装的具有稳定催化性能的花簇异质结构

摘要 具有大比表面积的超薄二维异质结构具有丰富的界面缺陷和改变的表面状态，提供了大量的活性位点。这种新颖的结构可以明显提高催化性能，受到了研究人员的关注。在此，探索了一种巧妙的方法来合成由超薄纳米带组装的花簇异质结构 NiCo/NiCoOx-SiO2，通过协调控制水热系统中的共沉淀，然后 H2 原位还原。NiCo合金纳米相均匀分散在稳定的超薄NiCoOx-SiO2纳米带上。基于花簇超薄二维异质结构和通过与 NiCoOx-SiO2 强相互作用稳定的 NiCo 活性位点的有利反应物传输，所获得的 NiCo/NiCoOx-SiO2 纳米催化剂表现出优异的稳定催化性能，允许循环超过 25 次，对硝基苯酚的胺化反应性能没有明显下降，并且即使在 400°C 下进行 CO 氧化反应 7 天后仍能保持 100% 的转化率。这项工作为构建稳定的非贵金属超薄异质结构纳米催化剂提供了一种新方法，该催化剂对环境污染物具有优异的催化降解性能，以满足绿色化学的要求。