Electrochemically Driven Specific Alkaline Metal Cation Adsorption on a Graphene Interface
Electrochemically Driven Specific Alkaline Metal Cation Adsorption on a Graphene Interface
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DOI：
10.1021/acs.jpcc.1c03322
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发表时间：
2021-10
期刊：
影响因子：
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通讯作者：
S. Yasuda;K. Tamura;Masaru Kato;H. Asaoka;Ichizo Yagi
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文献类型：
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作者：
S. Yasuda;K. Tamura;Masaru Kato;H. Asaoka;Ichizo Yagi
了解电解质中碱金属阳离子-石墨烯界面的电化学行为对于了解基本电化学界面和基于石墨烯的技术的发展至关重要。然而，大多数研究主要基于典型的电化学分析和计算评估进行，并且通过实验方法对带电界面处的阳离子和石墨烯的基本性质仍然知之甚少。在这里，我们报告了使用电化学表面X射线衍射（EC-SXRD）和拉曼（EC-Raman）光谱技术对碱金属阳离子和石墨烯的电化学行为进行了全面分析，其中可以阐明阳离子的界面结构以及石墨烯的充电状态和机械应变。 EC-SXRD 和循环伏安法证明了石墨烯表面上参与脱水和水合过程的电化学驱动的阳离子的特定吸附和解吸。在阳离子吸附条件下，EC-拉曼光谱显示石墨烯成为具有晶格膨胀的高电子掺杂态，这与钾石墨插层化合物的特征相似。这项研究为理解碱金属阳离子-石墨烯界面的基本电化学行为提供了新的见解，并有助于碳基新型应用的开发。
Understanding electrochemical behavior of the alkaline metal cation–graphene interface in electrolyte is essential for understanding the fundamental electrochemical interface and development of graphene-based technologies. However, most studies have been mainly conducted based on typical electrochemical analysis and computational evaluation, and the fundamental properties of both cations and graphene at the electrified interface by the experimental approach still remain poorly understood. Here, we report comprehensive analysis of the electrochemical behavior of both alkaline metal cations and graphene using electrochemical surface X-ray diffraction (EC-SXRD) and Raman (EC-Raman) spectroscopic techniques in which the interfacial structure of cations and the charging state and mechanical strain of the graphene can be elucidated. EC-SXRD and cyclic voltammetry demonstrated electrochemically driven specific adsorption and desorption of cations on the graphene surface involved in the dehydration and hydration process. Under the cation adsorption condition, EC-Raman spectroscopy revealed that graphene becomes a highly electron doped state with lattice expansion, which is a similar feature of the potassium–graphite intercalation compound. This study provides new insight for understanding fundamental electrochemical behavior of the alkaline metal cation–graphene interface and contributes to the development of carbon-based novel applications.