Estimation of resistance of rotating electrochemical cell associated with gas evolution on the electrode

The effect of centrifugal force on the resistance of rotating electrochemical cell with two vertical cylindrical electrodes with different radii (the outer electrode and the inner one) is analyzed. The resistance, which is caused by the gas bubbles formed on the outer electrode, is considered. One part of resistance is associated with the void fraction of interelectrode space, which is due to the bubbles moving in the radial direction from the outer electrode to the inner one under the action of centrifugal force. Another part of resistance is associated with screening of gas-evolving electrode surface with the bubbles, which have not been detached from the electrode. The variation in the sizes and velocity of bubbles moving in the interelectrode space due to the variation in the pressure in the radial direction as a result of the variation in the centrifugal acceleration is taken into account. The dependence of void fraction of interelectrode space on the radial coordinate, the distribution of resistance along the radial direction as a function of cell rotational rate and bubble radius at the instant of its detachment from the electrode, and the dependence of resistance, which is associated with electrode surface screening, on the radius of detached bubble are derived.