KINETICS OF FORMATION OF FLAT GAS-BUBBLE NUCLEI ON ELECTRODES

The mechanism is suggested for the separation of gas and liquid during formation of a Bat gas-bubble nucleus at an electrode, which accounts for the water structure. In this case, the solution supersaturation w ith gas is shown to be 32-fold to 55-fold. This coincides well with th e critical supersaturation that is sufficient for formation of a flat nucleus (30-fold to 50-fold values during oxygen and hydrogen evolutio n). It is also shown that the nucleus size increases with the current density, leading to an increased detachment size of the bubble. The si milar behavior of the calculated and the experimental dependences of t he bubble size on the current density indicates the plausibility of th e mechanism proposed.