The Hidden Role of the Supporting Electrode for Creating Heterogeneity in Single Entity Electrochemistry
The Hidden Role of the Supporting Electrode for Creating Heterogeneity in Single Entity Electrochemistry
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DOI：
10.1002/celc.202200245
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发表时间：
2022-05
期刊：
影响因子：
4
通讯作者：
Natalia Y. Molina;T. Pungsrisai;Z. J. O'Dell;Bianca Paranzino;K. Willets
中科院分区：
文献类型：
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作者：
Natalia Y. Molina;T. Pungsrisai;Z. J. O'Dell;Bianca Paranzino;K. Willets
单一实体电化学实验通常是出于揭示异质性如何影响内在多样性纳米粒子群体内的性能的需要。在这里，我们表明，一种常用的支持电极，掺锡氧化铟（ITO），也可以在纳米颗粒电化学响应中产生异质性方面发挥重要作用。为了研究基板的影响，我们光学监测ITO薄膜上的金纳米粒子的电溶解动力学，具有相似的电阻率从两个不同的供应商。来自两个供应商的ITO显示出金电溶解动力学的显著差异，其中一个供应商的ITO甚至在相同批号的基板上产生差的样品间重现性。纳米颗粒的尺寸和表面效应的作用占在我们的分析中，以验证所观察到的异质性是由ITO电极为主。结果表明，在进行单一实体结构-功能研究时，不能忽视支持电极的作用。
Single entity electrochemistry experiments are typically motivated by the need to reveal how heterogeneity affects performance within inherently diverse nanoparticle populations. Here we show that a commonly used supporting electrode, tin‐doped indium oxide (ITO), can also play a significant role in creating heterogeneity in nanoparticle electrochemical responses. To investigate the impact of the substrate, we optically monitored the electrodissolution kinetics of gold nanoparticles on ITO thin films with similar resistivity from two different suppliers. The ITO from the two suppliers showed marked differences in the gold electrodissolution kinetics, with ITO from one of the suppliers even producing poor sample‐to‐sample reproducibility across substrates within the same lot number. The role of nanoparticle size and surface effects were accounted for in our analysis to validate that the observed heterogeneity is dominated by the ITO electrodes. The results show that the role of the supporting electrode cannot be ignored when performing single entity structure‐function studies.