Potential Screening at Electrode/Ionic Liquid Interfaces from In Situ X-ray Photoelectron Spectroscopy.,ChemistryOpen

当前位置： X-MOL 学术 › Chemistryopen › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Potential Screening at Electrode/Ionic Liquid Interfaces from In Situ X-ray Photoelectron Spectroscopy.
ChemistryOpen ( IF 2.5 ) Pub Date : 2019-09-19 , DOI: 10.1002/open.201900211
Francesco Greco ₁ , Sunghwan Shin ₁ , Federico J Williams ₂ , Bettina S J Heller ₁ , Florian Maier ₁ , Hans-Peter Steinrück ₁

Affiliation

A new approach to investigate potential screening at the interface of ionic liquids (ILs) and charged electrodes in a two‐electrode electrochemical cell by in situ X‐ray photoelectron spectroscopy has been introduced. Using identical electrodes, we deduce the potential screening at the working and the counter electrodes as a function of applied voltage from the potential change of the bulk IL, as derived from corresponding core level binding energy shifts for different IL/electrode combinations. For imidazolium‐based ILs and Pt electrodes, we find a significantly larger potential screening at the anode than at the cathode, which we attribute to strong attractive interactions between the imidazolium cation and Pt. In the absence of specific ion/electrode interactions, asymmetric potential screening only occurs for ILs with different cation and anion sizes as demonstrated for an imidazolium chloride IL and Au electrodes, which we assign to the different thicknesses of the electrical double layers. Our results imply that potential screening in ILs is mainly established by a single layer of counterions at the electrode.

中文翻译：

利用原位 X 射线光电子能谱筛选电极/离子液体界面的电位。

介绍了一种通过原位 X 射线光电子能谱研究双电极电化学电池中离子液体 (IL) 和带电电极界面电位筛选的新方法。使用相同的电极，我们根据大量 IL 的电位变化推导出工作电极和对电极处的电位屏蔽作为施加电压的函数，该变化源自不同 IL/电极组合的相应核心水平结合能变化。对于基于咪唑鎓的离子液体和铂电极，我们发现阳极处的电位屏蔽明显大于阴极处的电势屏蔽，我们将其归因于咪唑鎓阳离子和铂之间的强吸引力相互作用。在没有特定离子/电极相互作用的情况下，不对称电位筛选仅发生在具有不同阳离子和阴离子大小的离子液体中，如氯化咪唑鎓离子液体和金电极所证明的那样，我们将其分配给不同厚度的双电层。我们的结果表明，离子液体中的电位筛选主要是由电极上的单层抗衡离子建立的。

更新日期：2019-09-19

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南11