Gruzdeva E. Electrochemical system Pb(II) methanesulfonate - PbO2

The aim of research was regularities of electrooxidation and electroreduction reactions at the Pb2+/PbO2 electrode in a flow battery with electrolytes based on lead(II) methansulfonate. On the basic of performed research the kinetic scheme of PbO2 deposition was proposed. It consists of 5 stages with taking part adsorbed oxygen-containing particles and mathanesulfonate Pb(II) complex and two types of intermediates of lead (III) and lead (IV). It was shown that F- additive decreases the rate of electron-transfer stage without mechanism changing. It is important to note that the decrease of coefficient of active mass usage is a result of PbO1,49-1,15 formation at lead dioxide electroreduction. It was shown that F- ions are incorporate in the deposited lead dioxide. Its content is changed in the range from 1,1 to 4,3 % depending on deposition conditions and electrolyte compositions. F-doped PbO2 has higher oxygen overpotential and less possibilities to formation incomplete reduced species at its reduction. It allows to perform charge-discharge process at higher rate in comparison with undoped-PbO2 up to 120/120 mA/cm2 with the high value of the of coefficient of an active mass usage (0,85-1,00).