Visualizing Phase Boundaries with Electrogenerated Chemiluminescence
Visualizing Phase Boundaries with Electrogenerated Chemiluminescence
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DOI：
10.1021/acs.jpclett.0c01207
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发表时间：
2020-06-18
影响因子：
5.7
通讯作者：
Dick, Jeffrey E.
中科院分区：
文献类型：
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作者：
Glasscott, Matthew W.;Dick, Jeffrey E.
从合成到多相催化，相界的反应性是许多化学领域的核心。新的工具是必要的，以获得在这些边界发生的过程更详细的了解。我们描述了一系列的实验，以可视化相界使用电致化学发光（ECL）在玻碳电极上。通过利用ECL发光体和共反应物在不同液相中的溶解度，我们证明了各种相的界面（即，在水微滴、1，2-二氯乙烷和玻璃碳电极之间形成的边界以及在氧气泡、水和玻璃碳电极之间形成的边界）。我们测量了微滴接触半径，三相边界厚度，和电生O-2气泡的生长动力学。这些实验工具和它们产生的基础知识将在生物学，纳米科学，合成，能量存储和转换中找到应用，其中理解相边界化学是必不可少的。
Reactivity at phase boundaries is central to many areas of chemistry, from synthesis to heterogeneous catalysis. New tools are necessary to gain a more detailed understanding of processes occurring at these boundaries. We describe a series of experiments to visualize phase boundaries using electrogenerated chemiluminescence (ECL) on glassy carbon electrodes. By taking advantage of the solubilities of the ECL luminophore and the coreactant in different liquid phases, we demonstrate that the interface of various phases (i.e., the boundaries formed between a water microdroplet, 1,2-dichloroethane, and a glassy carbon electrode and the boundaries formed between an oxygen bubble, water, and a glassy carbon electrode) can be evaluated. We measured microdroplet contact radii, the three-phase boundary thickness, and growth dynamics of electrogenerated O-2 bubbles. These experimental tools and the fundamental knowledge they yield will find applications in biology, nanoscience, synthesis, and energy storage and conversion, where understanding phase boundary chemistry is essential.