Department of Chemistry, University of Washington, Seattle, Washington 98115, United States.
Anal Chem. 2020 Mar 3;92(5):3682-3688. doi: 10.1021/acs.analchem.9b04793. Epub 2020 Feb 18.
In this work, we describe the preparation and use of a thin metal film modified Indium Tin Oxide (ITO) electrode as a highly conductive, transparent, and electrocatalytically active electrode material for studying nanobubbles generated at the electrode/solution interface. Hydrogen and oxygen nanobubbles were generated from water electrolysis on the surface of a Au/Pd alloy modified ITO electrode. The formation of single H and O nanobubbles was imaged in real time during a potential scan using single-molecule fluorescence microscopy. Our results show that while O nanobubbles can be detected at an early stage in the oxygen evolution reaction (OER), the formation of H nanobubbles requires a significant overpotential. Our study shows that thin-film-coated ITO electrodes are simple to make and can be useful electrode substrates for (single molecule) spectroelectrochemistry research.
在这项工作中，我们描述了一种薄金属膜修饰的氧化铟锡（ITO）电极的制备和使用，该电极作为一种高导电性、透明且具有电催化活性的电极材料，用于研究在电极/溶液界面上生成的纳米气泡。在 Au/Pd 合金修饰的 ITO 电极表面上，通过水电解生成了氢气和氧气纳米气泡。使用单分子荧光显微镜在电势扫描过程中实时成像单 H 和 O 纳米气泡的形成。我们的结果表明，虽然在析氧反应（OER）的早期可以检测到 O 纳米气泡，但 H 纳米气泡的形成需要很大的过电势。我们的研究表明，薄膜涂层 ITO 电极易于制备，并且可以作为（单分子）光谱电化学研究的有用电极衬底。
