Fundamental understanding of the synthesis of well-defined supported non-noble metal intermetallic compound nanoparticles
Fundamental understanding of the synthesis of well-defined supported non-noble metal intermetallic compound nanoparticles
复制标题
对明确负载型非贵金属金属间化合物纳米颗粒的合成的基本了解
DOI：
10.1039/d2cy00183g
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发表时间：
2022
影响因子：
5
通讯作者：
Laursen, Siris
中科院分区：
文献类型：
--
作者：
Song, Yuanjun;He, Yang;Laursen, Siris
获得定义良好的、类模型的、非贵金属金属间化合物纳米材料（<10 nm），具有相纯体、类体第一原子层表面组成、独特的电子和表面化学性质，对催化、电子和传感器开发领域至关重要。非贵金属金属间化合物是由过渡金属和半金属或后过渡金属组成的有序固体化合物。由于组成元素的反应性升高以及它们与支撑材料的相互作用，将它们合成为类似模型的高表面积负载纳米颗粒具有挑战性。在这项研究中，我们对控制这些材料合成的基本现象有了系统的理解，从而可以生产出具有块状表面末端的相纯块状纳米颗粒（<10 nm）。研究了前驱体和载体的选择、H2的化学势、还原温度和退火程序的影响，以了解决定相纯度和稳定性以及第一原子层表面组成的颗粒形成和相互作用的基本动力学。所开发的理解可以作为进一步开发具有良好定义的纳米颗粒的高级合成方法的基础。
Access to well-defined, model-like, non-noble metal intermetallic compound nanomaterials (<10 nm) with phase pure bulk, bulk-like 1st-atomic-layer surface composition, and unique electronic and surface chemical properties is critical for the fields of catalysis, electronics, and sensor development. Non-noble metal intermetallic compounds are compositionally ordered solid compounds composed of transition metals and semimetals or post-transition metals. Their synthesis as model-like high-surface-area supported nanoparticles is challenging due to the elevated reactivity of the constituent elements and their interaction with the support material. In this study, we have developed a systematic understanding of the fundamental phenomena that control the synthesis of these materials such that phase pure bulk nanoparticles (<10 nm) may be produced with bulk-like surface terminations. The effects of the precursor and support choice, chemical potential of H2, reduction temperature, and annealing procedures were investigated to understand the fundamental kinetics of particle formation and interactions that dictate phase purity and stability and 1st-atomic-layer surface composition. The understanding developed may serve as a foundation for further developing advanced synthesis procedures for well-defined nanoparticles with increasing compositional complexity.