Probing Single-Particle Electrocatalytic Activity at Facet-Controlled Gold Nanocrystals.,Nano Letters

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Probing Single-Particle Electrocatalytic Activity at Facet-Controlled Gold Nanocrystals.
Nano Letters ( IF 9.6 ) Pub Date : 2020-01-21 , DOI: 10.1021/acs.nanolett.9b04640
Myunghoon Choi ₁ , Natasha P Siepser ₁ , Soojin Jeong ₁ , Yi Wang ₁ , Gargi Jagdale ₁ , Xingchen Ye ₁ , Lane A Baker ₁

Affiliation

Electrocatalytic reduction reactions (i.e., the hydrogen evolution reaction (HER) and oxygen reduction reaction) at individual, faceted Au nanocubes (NCs) and nano-octahedra (ODs) expressing predominantly {100} and {111} crystal planes on the surface, respectively, were studied by nanoscale voltammetric mapping. Cyclic voltammograms were collected at individual nanoparticles (NPs) with scanning electrochemical cell microscopy (SECCM) and correlated with particle morphology imaged by electron microscopy. Nanoscale measurements from a statistically informative set of individual NPs revealed that Au NCs have superior HER electrocatalytic activity compared to that of Au ODs, in good agreement with macroscale cyclic voltammetry measurements. Au NCs exhibited more particle-to-particle variation in catalytic activity compared to that with Au ODs. The approach of single-particle SECCM imaging coupled with macroscale CV on well-defined NPs provides a powerful toolset for the design and activity assessment of nanoscale electrocatalysts.

中文翻译：

在面控制的金纳米晶体上探测单颗粒电催化活性。

分别在表面上主要表达{100}和{111}晶面的单个多面金纳米立方体（NCs）和纳米八面体（ODs）上的电催化还原反应（即氢释放反应（HER）和氧还原反应）通过纳米级伏安图进行了研究。用扫描电化学电池显微镜（SECCM）在各个纳米颗粒（NPs）上收集循环伏安图，并与电子显微镜成像的颗粒形态相关。从一组具有统计意义的单个NP进行的纳米级测量表明，Au NCs与Au ODs相比，具有更好的HER电催化活性，这与大规模循环伏安法测量非常吻合。与使用Au ODs相比，Au NCs在催化活性方面表现出更多的颗粒间差异。

更新日期：2020-01-22

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