Shell isolated nanoparticles for enhanced Raman spectroscopy studies in lithium-oxygen cells
Shell isolated nanoparticles for enhanced Raman spectroscopy studies in lithium-oxygen cells
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DOI：
10.1039/c7fd00151g
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发表时间：
2017-12-01
影响因子：
3.4
通讯作者：
Hardwick, Laurence J.
中科院分区：
文献类型：
--
作者：
Galloway, Thomas A.;Cabo-Fernandez, Laura;Hardwick, Laurence J.
对在不同电极衬底上使用壳层隔离纳米粒子进行增强拉曼光谱(发光体)进行了关键和详细的评估，提供了相关的增强因子，并评估了壳层隔离纳米粒子在电极表面的分布。用Shoers技术研究了锂金属电极表面的化学组成和与锂氧电池相关的碳基片上氧还原反应的机理。闪光剂增强了这些表面的拉曼信号，显示出在各种电解液中的锂金属表面形成了以Li2O为主的涂层。在以二甲基亚砜为基础的非水电解液中，在电位控制下，氧在平面碳电极界面和复合碳黑电极上生成LiO2和Li2O2，并发生降解反应生成Li2CO3。
A critical and detailed assessment of using Shell Isolated Nanoparticles for Enhanced Raman Spectroscopy (SHINERS) on different electrode substrates was carried out, providing relative enhancement factors, as well as an evaluation of the distribution of shell-isolated nanoparticles upon the electrode surfaces. The chemical makeup of surface layers formed upon lithium metal electrodes and the mechanism of the oxygen reduction reaction on carbon substrates relevant to lithium-oxygen cells are studied with the employment of the SHINERS technique. SHINERS enhanced the Raman signal at these surfaces showing a predominant Li2O based layer on lithium metal in a variety of electrolytes. The formation of LiO2 and Li2O2, as well as degradation reactions forming Li2CO3, upon planar carbon electrode interfaces and upon composite carbon black electrodes were followed under potential control during the reduction of oxygen in a non-aqueous electrolyte based on dimethyl sulfoxide.