Cover Feature: Reduction of 4‐Nitrothiophenol on Ag/Au Bimetallic Alloy Surfaces Studied Using Bipolar Raman Spectroelectrochemistry (ChemElectroChem 10/2020),ChemElectroChem

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Cover Feature: Reduction of 4‐Nitrothiophenol on Ag/Au Bimetallic Alloy Surfaces Studied Using Bipolar Raman Spectroelectrochemistry (ChemElectroChem 10/2020)
ChemElectroChem ( IF 3.5 ) Pub Date : 2020-04-22 , DOI: 10.1002/celc.202000487
Buhua Wang ₁ , Songyan Yu ₁ , Curtis Shannon ₁

Affiliation

The Cover Feature illustrates the use of confocal Raman microscopy in conjunction with bipolar electrochemistry to obtain multidimensional spectroelectrochemical data in situ. The bipolar cathode consists of a continuous composition gradient of electrodeposited Ag/Au modified with a 4‐nitrothiophenol (4‐NTP) self‐assembled monolayer (SAM). The alloy gradient is oriented 90° to the applied electric field, and SERS data collected at a series of points across the surface is used to map the redox state of the SAM as a function of electrode potential and alloy composition. Spectroelectrochemical measurements show that, when the alloy composition is mostly Au, 4‐NTP is directly reduced to 4‐aminothiophenol. In contrast, when the Ag content of the alloy increases, a two‐step mechanism becomes operative due to photochemical processes promoted by the changed optical characteristics of the Ag‐rich alloy. More information can be found in the Article by B. Wang et al.

中文翻译：

封面功能：使用双极拉曼光谱电化学研究在Ag / Au双金属合金表面上还原4-硝基硫酚（ChemElectroChem 10/2020）

封面功能举例说明了共焦拉曼显微镜与双极电化学结合使用以获得原位多维光谱电化学数据的方法。双极阴极由电沉积的Ag / Au的连续成分梯度组成，该成分由4-硝基硫酚（4-NTP）自组装单层（SAM）修饰。合金梯度与施加的电场成90°角，并且在整个表面的一系列点上收集的SERS数据用于根据电极电势和合金成分绘制SAM的氧化还原状态。光谱电化学测量表明，当合金成分主要为Au时，4-NTP直接还原为4-氨基硫酚。相反，当合金中的Ag含量增加时，由于富银合金光学特性的改变促进了光化学过程，因此两步机制开始起作用。可以在B. Wang等人的文章中找到更多信息。

更新日期：2020-04-22

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