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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Bipolar Nanoimpact Transients: Controlling the Redox Potential of Nanoparticles in Solution
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Bipolar Nanoimpact Transients: Controlling the Redox Potential of Nanoparticles in Solution

机译：双极纳米仪瞬变：控制溶液中纳米颗粒的氧化还原电位

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摘要

In the bulk solution phase the electrical potential of a single metallic nanoparticle can be controlled by its local chemical environment. In this work it is demonstrated how this nanoparticle "redox" potential determines-in the case of platinum-the surface functionality of the nanomaterial. Specifically we report that in the aqueous solution phase the surface adsorption of hydrogen onto the platinum interface is inhibited by the addition of iodine to the solution. The iodine does not competitively inhibit the hydrogen deposition, but rather alters the nanoparticle potential, making it comparatively oxidizing. This work evidences this behavior through single nanoparticle electrochemistry and supports these results with characterization using ex-situ energy dispersive X-ray analysis. We show how the electrochemical response depends on the chemical "redox" state of the nanoparticle in the solution phase; this leads to the first reported example of a bipolar single nanoparticle event characterized by the single nanoparticle impact current transient initially being reductive before switching after ca. 50 ms to being oxidative.
机译：在本体溶液中，单个金属纳米粒子的电势可以通过其本地化学环境控制。在这项工作中，证明了这种纳米粒子“氧化还原”电位如何确定 - 在铂 - 纳米材料的表面官能团的情况下。具体地，我们认为，在水溶液中，通过向溶液中加入碘来抑制氢气到铂界面上的表面吸附。碘不竞争性地抑制氢沉积，而是改变纳米颗粒电位，使其相对氧化。这项工作通过单纳米粒子电化学证明这种行为，并使用前u能量分散X射线分析来支持这些结果。我们展示了电化学反应如何取决于溶液相中纳米粒子的化学“氧化还原”状态;这导致了由单纳米颗粒冲击电流瞬时进行的双极单纳米颗粒事件的第一个报道的例子，最初在CA之后切换前最初还原。氧化50毫秒。

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