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Facile Gram-Scale Synthesis of Size-Tunable MgO Nanosheets Enclosed by (111) Surface with Remarkable Stability and Uniform Host Sites for Atom Dispersion
Chemistry of Materials ( IF 7.2 ) Pub Date : 2024-04-16 , DOI: 10.1021/acs.chemmater.3c03018
Shengpei Zhang, Chao Zhao, Yves Ira A. Reyes, Pei Xiong, Tianxiang Chen, Tianqi Cheng, Xianfeng Yi, Shang-Wei Chou, Chia-Ying Chien, Ya-Yun Yang, Jian Lin Chen, Tsz Woon Benedict Lo, Molly Meng-Jung Li, Hsin-Yi Tiffany Chen, Anmin Zheng, Yung-Kang Peng

MgO has long been utilized as a catalyst/support with Lewis base properties in the chemical industry, but its synthesis with exposed (111) surfaces has received relatively little attention compared to those of (110) and (100) surfaces. The unique adsorption energy of this surface for adsorbates also remains elusive. Herein, we present a simple and scalable method for the production of MgO nanosheets exposing the (111) surface (denoted as MgO(111) NSs). This is achieved through the topotactic conversion of Mg(OH)2 NSs at elevated temperatures in an air environment. By adjusting the precursor ratio and the strength of the base, we successfully prepared Mg(OH)2 NSs consisting of approximately 6 atomic layers with lateral sizes ranging from 80 nm to 1 μm in a single step. Subsequent thermal dehydration yields MgO(111) NSs with a preserved dimension. Using Ru as the adsorbate, we found that the remarkable stability and uniformity of its atomic dispersion on the (111) surface can be attributed to the strong structural coordination provided by three oxygen atoms. In contrast, the metal–support interaction on the (110) and (100) surfaces proved to be insufficient to overcome the cohesive energy between Ru atoms, resulting in the formation of Ru clusters. Beyond Ru, this study holds great potential in guiding the rational selection of surfaces to achieve a uniform atomic dispersion of other elements.

中文翻译:

轻松克级合成尺寸可调的 MgO 纳米片,其被 (111) 表面包围,具有显着的稳定性和均匀的原子分散主位点

MgO长期以来在化学工业中被用作具有路易斯碱性质的催化剂/载体,但与(110)和(100)表面相比,其暴露(111)表面的合成受到的关注相对较少。该表面对吸附物的独特吸附能也仍然难以捉摸。在此,我们提出了一种简单且可扩展的方法来生产暴露(111)表面的MgO纳米片(表示为MgO(111)NS)。这是通过在空气环境中高温下Mg(OH) 2 NSs的拓扑转化来实现的。通过调整前驱体比例和基底强度,我们成功一步制备了由大约6个原子层组成、横向尺寸在80 nm到1 μm之间的Mg(OH) 2 NSs。随后的热脱水产生尺寸保持不变的 MgO(111) NS。使用Ru作为吸附物,我们发现其原子分散在(111)表面上的显着稳定性和均匀性可归因于三个氧原子提供的强结构配位。相反,(110)和(100)表面上的金属-载体相互作用被证明不足以克服Ru原子之间的内聚能,导致Ru簇的形成。除了钌之外,这项研究在指导合理选择表面以实现其他元素的均匀原子分散方面具有巨大潜力。
更新日期:2024-04-16
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