Center for Bioelectronics and Biosensors, Biodesign Institute, Arizona State University, Tempe, Arizona 85287, United States.
Nat Nanotechnol. 2012 Oct;7(10):668-72. doi: 10.1038/nnano.2012.134. Epub 2012 Aug 26.
The electrocatalytic properties of nanoparticles depend on their size, shape and composition. These properties are typically probed by measuring the total electrocatalytic reaction current of a large number of nanoparticles, but this approach is time-consuming and can only measure the average catalytic activity of the nanoparticles under study. However, the identification of new catalysts requires the ability to rapidly measure the properties of nanoparticles synthesized under various conditions and, ideally, to measure the electrocatalytic activity of individual nanoparticles. Here, we show that a plasmonic-based electrochemical current-imaging technique can simultaneously image and quantify the electrocatalytic reactions of an array of 1.6 × 10(5) platinum nanoparticles printed on an electrode surface, which could facilitate high-throughput screening of the catalytic activities of nanoparticles. We also show that the approach can be used to image the electrocatalytic reaction current and measure the cyclic voltammograms of single nanoparticles.
纳米粒子的电催化性能取决于其尺寸、形状和组成。这些性质通常通过测量大量纳米粒子的总电催化反应电流来探测，但这种方法耗时且只能测量所研究纳米粒子的平均催化活性。然而，新型催化剂的鉴定需要能够快速测量在各种条件下合成的纳米粒子的性质，并且理想情况下，需要测量单个纳米粒子的电催化活性。在这里，我们表明基于等离子体的电化学电流成像技术可以同时对电极表面上打印的 1.6×10(5)个铂纳米粒子阵列的电催化反应进行成像和定量，这可以促进纳米粒子催化活性的高通量筛选。我们还表明，该方法可用于成像单个纳米粒子的电催化反应电流并测量循环伏安图。
