[22a-W631-1~12] 12.2 Characterization and Materials Physics

[22a-W631-8] Structuring, Dynamics, Electric Double Layer Formation of Interfacial Ionic Liquid Faced to Graphite Electrode Analyzed by MD Calculation

Hiroo Miyamoto¹, Yasuyuki Yokota², Akihito Imanishi¹, Kouji Inagaki³, Yoshitada Morikawa³, 〇Ken-ichi Fukui¹ (1.Osaka Univ., 2.RIKEN, 3.Osaka univ.)

Keywords:ionic liquid,electrode interface,electric double layer

Structuring, dynamics, and electric double layer formation of the interfacial ionic liquid (IL) faced to a graphite electrode surface were analyzed by molecular dynamics (MD) calculations. It was found that layered structure of IL(BMI-TFSI) with more preference of cation to the graphite was formed even at a neutral surface. The origin of the interfacial structure will be discussed by comparing with the result on a C₆₀ crystal surface. Negatively charged surfaces resulted in higher concentration of cations faced to the graphite and the effect of the structure was extended to a few nm range. In contrast, preference of anion at positively charged surfaces was not so apparent. It indicates the interface structure does not symmetrically respond against the applied voltage.