Size-Dependent Intercalation of Ions into Highly Oriented Pyrolytic Graphite in Ionic Liquids: An Electrochemical Atomic Force Microscopy Study

作者：Singh Pankaj R; Zeng Xiangqun^*

来源：Journal of Physical Chemistry C, 2011, 115(35): 17429-17439.

DOI：10.1021/jp203833v

Morphological changes of the highly oriented pyrolytic graphite (HOPG) surface during electrochemical intercalation-deintercalation process in pure ionic liquids (ILs) have been studied using electrochemical atomic force microscopy (EC-AFM). The results show that electrochemical intercalation of ions into HOPG is strongly dependent on anionic size of the ILs used. Up to 0.8 V versus the Ag quasi reference, drastic reversible morphological changes of HOPG surface during anion intercalation-deintercalation were observed in [BMIM][HSO4], whereas these changes were absent in [BMIM][N(Tf)(2)]. However, at and above 1.2 V, the HOPG surface degrades in both the ILs to form carbon nanoparticles.

• 出版日期2011-9-8