Ultrathin Two-Dimensional Pd-Based Nanorings as Catalysts for Hydrogenation with High Activity and Stability
Ultrathin Two-Dimensional Pd-Based Nanorings as Catalysts for Hydrogenation with High Activity and Stability
复制标题
超薄二维钯基纳米环作为高活性和稳定性加氢催化剂
DOI：
10.1002/smll.201500769
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发表时间：
2015-09-23
期刊：
影响因子：
13.3
通讯作者：
Yang, Deren
中科院分区：
文献类型：
--
作者：
Li, Yi;Wang, Wenxing;Yang, Deren
尽管关于合成由贵金属制成的超薄二维纳米片的报道很少，但生成超薄空心纳米结构仍然是一个巨大的挑战，由于其独特的结构特征，这种结构在高活性催化中特别令人感兴趣。在这里，通过在预制的 Pd 纳米片外围选择性外延生长 Pd 原子并结合氧化蚀刻，合成了具有中空内部的超薄 2D Pd 纳米环。这种方法可以扩展到制造 Pd 基双金属超薄纳米环，例如 Pd-Pt。 Pd纳米环对对硝基苯酚的氢化活性显着增强，分别比Pd纳米片和商用钯黑高2.2和33.4倍。值得注意的是，十个循环后，钯纳米环高度稳定，活性仅损失不到 11%，而钯纳米片损失了 45.7%，钯黑损失了 72.2%。
Despite a few reports on the synthesis of ultrathin 2D nanosheets made of noble metals, it still remains a tremendous challenge to generate their ultrathin hollowed nanostructures, which are of particular interest in highly active catalysis due to their unique structural features. Here, the synthesis of ultrathin 2D Pd nanorings is reported with a hollow interior by selective epitaxial growth of Pd atoms on the periphery of the as-preformed Pd nanosheets in combination with oxidative etching. This approach can be extended to fabricate Pd-based bimetallic ultrathin nanorings such as Pd-Pt. The Pd nanorings exhibit substantially enhanced activity toward the hydrogenation of p-nitrophenol, which is 2.2 and 33.4 times higher than that of the Pd nanosheets and commercial Pd black, respectively. Significantly, the Pd nanorings are highly stable with only less than 11% loss in activity compared to 45.7% loss of the Pd nanosheets and 72.2% loss of the Pd black after ten cycles.