An Integrated Electrochemistry Approach to the Design and Synthesis of Polyhedral Noble Metal Nanoparticles,Journal of the American Chemical Society

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An Integrated Electrochemistry Approach to the Design and Synthesis of Polyhedral Noble Metal Nanoparticles
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2020-11-25 , DOI: 10.1021/jacs.0c07987
Sean P. McDarby ₁ , Claire J. Wang ₁ , Melissa E. King ₁ , Michelle L. Personick ₁

Affiliation

The synthesis of shaped metal nanoparticles to meet the precise needs of emerging applications requires intentional synthetic design directed by fundamental chemical principles. We report an integrated electrochemistry approach to nanoparticle synthetic design that couples current-driven growth of metal nanoparticles on an electrode surface-in close analogy to standard colloidal synthesis-with electrochemical measurements of both electrochemical and colloidal nanoparticle growth. A simple chronopotentiometry method was used to translate an existing colloidal synthesis for corrugated palladium (Pd) nanoparticles to electrochemical growth on a glassy carbon electrode, with minimal modification to the growth solution. The electrochemical synthesis method was then utilized to produce large Pd icosahedra, a shape whose synthesis is challenging in a colloidal growth environment. This electrochemical synthesis for Pd icosahedra was used to develop a corresponding colloidal growth solution by tailoring a weak reducing agent to the measured potential profile of the electrochemical synthesis. Finally, measurements of colloidal syntheses were employed as guides for the directed design of electrochemical syntheses for Pd cubes and octahedra. Together, this work provides a cyclical approach to shaped nanoparticle design that allows for the optimization of nanoparticles grown via a colloidal approach with a chemical reducing agent or synthesized with an applied current on an electrode surface as well as subsequent bidirectional translation between the two methods. The enhanced chemical flexibility and direct tunability of this electrochemical method relative to combinatorial design of colloidal syntheses have the potential to accelerate the synthetic design process for noble metal nanoparticles with targeted morphologies.

中文翻译：

多面体贵金属纳米颗粒设计和合成的综合电化学方法

为满足新兴应用的精确需求而合成成形金属纳米粒子需要在基本化学原理的指导下进行有意的合成设计。我们报告了一种纳米颗粒合成设计的集成电化学方法，该方法将电极表面上金属纳米颗粒的电流驱动生长（与标准胶体合成非常相似）与电化学和胶体纳米颗粒生长的电化学测量相结合。使用简单的计时电位法将现有的波纹状钯 (Pd) 纳米颗粒胶体合成转化为玻碳电极上的电化学生长，对生长溶液进行最少的修改。然后利用电化学合成方法生产大 Pd 二十面体，在胶体生长环境中合成具有挑战性的形状。这种 Pd 二十面体的电化学合成用于通过根据电化学合成的测量电位曲线定制弱还原剂来开发相应的胶体生长溶液。最后，胶体合成的测量被用作指导设计 Pd 立方体和八面体的电化学合成。总之，这项工作为成形纳米粒子设计提供了一种循环方法，该方法允许优化通过胶体方法生长的纳米粒子和化学还原剂，或在电极表面施加电流合成的纳米粒子，以及随后两种方法之间的双向转换。

更新日期：2020-11-25

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