Category Archives: расплавы солей

Capacitance and impedance of rhenium in molten alkali chlorides

Ye. V. Kirillova

ABSTRACT:

Capacitance–potential dependences for rhenium electrode in molten NaCl, KCl, CsCl were obtained at various temperatures and ac frequencies. Impedance parameters were calculated. It was shown that the capacitance curves in these systems are generally parabolic with two minima, whereas three minima were found in sodium and potassium chlorides at relatively low temperatures. Cathodic potential of minimum capacitance measured within ac range 103 Hz coincides with the corresponding minimum of double layer capacitance obtained by impedance fitting. Medium and anodic potentials of minimum capacitance measured within ac range 1 Hz coincide with the two minima of adsorption capacitance.

KEY WORDS:

rhenium, molten alkali chlorides, capacitance, impedance, potential of minimum capacitance, adsorption

 

Quantum-chemical study of charge transfer mechanism in the MgTiF6 + 12MgCl2 system

V. G. Kremenetsky, S. A. Kuznetsov

ABSTRACT:

On the basis of quantum-chemical analysis of frontier molecular orbitals, the mechanism of electrochemical electron transfer in the model system MgTiF6 + 12MgCl2 is proposed. It is shown that the geometric structure of the transition state is not intermediate between the initial and final states of the system. The most probable option, providing the possibility of electron transfer to the system, is the phase of contraction of Ti–F bonds during the fully symmetrical oscillation.

KEY WORDS:

molten salts, electrochemical charge transfer, quantum-chemical analysis, frontier orbitals