Electrochemical Potential Stabilization of Reconstructed Au(111) Structure by Monolayer Coverage with Graphene

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• 作者：Satoshi Yasuda ; Ryota Kumagai ; Koji Nakashima ; Kei Murakoshi
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2015
• 出版时间：September 3, 2015
• 年：2015
• 卷：6
• 期：17
• 页码：3403-3409
• 全文大小：343K
• ISSN：1948-7185

文摘

The electrochemical properties of a monolayer graphene grown on a Au(111) electrode were studied using cyclic voltammetry (CV) and electrochemical scanning tunneling microscopy (EC-STM). CV and EC-STM measurements in 0.1 M H₂SO₄ aqueous solution revealed that graphene grown on the reconstructed (22 脳 鈭?) Au(111) structure effectively inhibited potential-induced structural transitions between reconstructed (22 脳 鈭?) and unreconstructed (1 脳 1), and the adsorption/desorption of SO₄^{2鈥?/sup> ions, which are intrinsic behavior of the bare Au(111) surface. The underlying reconstructed structure was significantly stabilized by covering with monolayer graphene over a wide potential range between 鈭?.2 V and +1.35 V vs Ag/AgCl (saturated KCl), which is much wider than that for bare Au(111) (鈭?.2 to + 0.35 V vs Ag/AgCl (saturated KCl)). Such high stability has not been reported to date; therefore, these results are considered to be important for understanding the fundamentals of surface reconstruction and also serve to open a new branch of electrochemistry related to graphene/metal鈥揺lectrolyte interfaces.}