STUDY OF ELECTROCHEMICAL INTERCALATION OF GRAPHITE IN SOLUTIONS OF HNO3 WITH METHOD OF CHRONOVOLTAMPEROMETRY

DOI: 
10.6060/tcct.2017601.5459

For citation:
Yakovlev A.V., Finaenov A.I.,
Yakovleva E.V., Kuznetsova N.Yu., Abdullina D.F. Study of electrochemical
intercalation of graphite in solutions of HNO3 with method of
chronovoltamperometry. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 1. P. 34
-39.

 

The physico-chemical properties of suspensions of graphite-nitric acid
were studied. The ratios of the components in suspension providing the
possibility of their anodic oxidation with the formation of compounds of the
implementation of graphite were determined. The values of electrical conductivity
of suspensions of graphite-nitric acid with different ratio of the solid and
liquid phases were determined .The maximum value of the electrical conductivity
of suspensions is achieved at the mass ratio of graphite to HNO3
» 1:0.66. The design of the electrochemical cell
for carrying out chronovoltamperometric measurements on a suspension graphite
electrode was developed. The nature and kinetics of electrode processes on
dispersed graphite electrodes in 60% nitric acid were studied. It is shown that
under anodic polarization of dispersion graphite electrode the complex of
anodic processes occurs: the oxidation of surface of functional groups, the
formation of compounds of implementation and evolution of oxygen. Maximum
electrochemical reversibility of the anodic processes on the suspensions of
graphite-HNO3 observed at Erev< 1.2 V, the rate of
reactions of formation of compounds of the introduction of graphite and
reactions involving surface functional groups on the electrode slurry increases
in the range of potentials of 1.2-1.7 V. At that, the current is increase
mainly causes by electrochemically reversible process of intercalation, since
at the reverse cycle in the cathode area also recorded the growth of the
current due to the reaction of deintercalation. An electrochemical oxidation of
dispersed graphite electrode in HNO3 should be in the range of
potentials from 1.2 V to 2.1 V, which will provide formation of compounds of
introduction of graphite with the maximum rate and minimum power input.

Key words: graphite
implementation compound, chronovoltamperometry, graphite nitrate,
electrochemical intercacclation, suspension electrode

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2017, Т. 60, № 1, Стр. 34-39

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