Structure of Water in the Dense Part
of Electrical Double Layer on a Mercury Electrode

R. R. Nazmutdinov and S. V. Borisevich

Kazan State Technological University, ul. Karla Marksa 68, Kazan, 420015 Tatarstan, Russia

Received August 11, 1998; in final form, March 11, 1999

Abstract—The water structure in the dense part of the electrical double layer (EDL) on a mercury electrode is
studied by the classical Monte-Carlo method in a wide range of surface charges. The interaction with the metal
is described by a potential constructed on the basis of ab initio quantum-chemical calculations. An attempt is
undertaken to interpret on a microscopic level the known experimental results obtained earlier by the technique
of a laser temperature jump for the mercury/inactive electrolyte interface. The calculated dependence of the
derivative of the dipole potential drop on the temperature Vh as a function of the electrode charge nicely con-
forms to the experimental data. The experimentally observed decrease in relaxation times near zeros in the
V
h() function is explained on the basis of the phenomenon of dipole reorientation and the behavior of hydrogen
bonds between water molecules in a monolayer. The qualitative effects observed experimentally are caused by
structurization of water in the dense part of EDL and may be explained without any additional hypothesis on
phase transitions.


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