Concave nano-octahedral alloys: wet chemical synthesis of bimetallic Pt–Pd nanocrystals with high-index {hhl} Facets,Dalton Transactions

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Concave nano-octahedral alloys: wet chemical synthesis of bimetallic Pt–Pd nanocrystals with high-index {hhl} Facets
Dalton Transactions ( IF 3.5 ) Pub Date : 2021-08-23 , DOI: 10.1039/d1dt02305e
Guifen Du _{1,

2} , Qiaoli Chen ₃ , Hui Jin ₃ , Shuifen Xie ₄ , Qin Kuang ₂ , Zhaoxiong Xie ₂

Affiliation

Concave morphologies provide noble metal nanocrystals (NCs) with unique performances due to large specific surface areas, high curves, hot spots, and elevated energy facets. As a result, concave morphologies have attracted considerable attention in many areas. However, most NCs with concave shapes are currently made of a single metal, leaving plenty of room for easy wet chemical synthesis and structural analysis of unique concave structures, especially bimetallic compounds. In this work, concave octahedral Pt–Pd alloy NCs with high-index {hhl} faces were synthesized using glycine as a coordination molecule and polyvinylpyrrolidone as the surfactant and reducing agent. The high-index facets coupled with the synergistic and electronic effects between Pt and Pd provided concave octahedral Pt–Pd alloy NCs with excellent activity and stability toward the electrooxidation of formic acid when compared to their convex counterparts and commercial Pt black.

中文翻译：

凹面纳米八面体合金：具有高指数 {hhl} 面的双金属 Pt-Pd 纳米晶体的湿化学合成

由于大比表面积、高曲线、热点和高能量面，凹形形态为贵金属纳米晶体 (NC) 提供了独特的性能。因此，凹形形态在许多领域引起了相当大的关注。然而，大多数具有凹面形状的 NC 目前由单一金属制成，这为简单的湿化学合成和独特凹面结构的结构分析留下了足够的空间，尤其是双金属化合物。在这项工作中，凹八面体 Pt-Pd 合金 NCs 具有高指数 { hhl使用甘氨酸作为配位分子和聚乙烯吡咯烷酮作为表面活性剂和还原剂合成面。与凸面对应物和商业 Pt 黑相比，高指数面加上 Pt 和 Pd 之间的协同和电子效应提供了凹八面体 Pt-Pd 合金 NC，对甲酸的电氧化具有优异的活性和稳定性。

更新日期：2021-08-31

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