Department of Chemistry and Biochemistry, Queens College of the City University and New York, Flushing, NY 11367 (USA).
Angew Chem Int Ed Engl. 2014 Dec 15;53(51):14120-3. doi: 10.1002/anie.201408408. Epub 2014 Oct 21.
Electrochemistry at individual metal nanoparticles (NPs) can provide new insights into their electrocatalytic behavior. Herein, the electrochemical activity of single AuNPs attached to the catalytically inert carbon surface is mapped by using extremely small (≥3 nm radius) polished nanoelectrodes as tips in the scanning electrochemical microscope (SECM). The use of such small probes resulted in the spatial resolution significantly higher than in previously reported electrochemical images. The currents produced by either rapid electron transfer or the electrocatalytic hydrogen evolution reaction at a single 10 or 20 nm NP were measured and quantitatively analyzed. The developed methodology should be useful for studying the effects of nanoparticle size, geometry, and surface attachment on electrocatalytic activity in real-world application environment.
在单个金属纳米粒子 (NPs) 上的电化学可以为它们的电催化行为提供新的见解。在此，通过使用非常小的（≥3nm 半径）抛光纳米电极作为尖端，在扫描电化学显微镜 (SECM) 中绘制了附着在催化惰性碳表面上的单个 AuNPs 的电化学活性。这种小探针的使用导致空间分辨率明显高于以前报道的电化学图像。测量并定量分析了单个 10 或 20nm NP 上的快速电子转移或电催化析氢反应产生的电流。所开发的方法对于研究在实际应用环境中纳米粒子尺寸、几何形状和表面附着对电催化活性的影响应该是有用的。
