By Lewis G.N., Mayer J.E.

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Anyway, there are two effects of hydrogen evolution on copper electrodeposition leading to the formation of the honeycomb-like structures. D. I. Popov the morphology of the copper deposits due to the effect of hydrogen bubbles on the current density distribution on the growing electrode surface. The uniform distribution of morphological forms on the electrode surface means the same hydrodynamic conditions exist over the whole electrode surface and the honeycomb-like structure indicates to the local effect of hydrogen bubbles.

The nuclei can be formed on those centres whose critical overpotential is lower or equal to the overpotential externally applied to the cell. The higher the applied overpotential, the greater the number of 21 55 600 50 500 45 400 40 300 35 200 30 100 Number of holes / mm2 D / μm Hydrogen Co-deposition Effects on Copper Electrodeposition 25 0 40 80 120 0 160 t/s Figure 19. The dependence of average diameters of the surface holes, D (open circles), number of “regular holes” per square millimeter surface area of copper electrodes (open triangles) and number of “irregular holes” per square millimeter surface area of copper electrodes (inverted traingles) on electrolysis times.

5 mA h cm−2 are shown in Fig. D. I. Popov shoulders. The bottom of the dish-like holes was almost compact (Fig. 28b), while the interior of the hole was constructed of disperse agglomerates of copper grains (Fig. 28c). Very branched copper dendrites and small cauliflower-like forms were formed among the dishlike holes during the electrodeposition of copper from this solution (Fig. 28d). On the basis of the presented analysis of the electrodeposition processes at an overpotential of 1,000 mV (Figs.

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A Disproof of the Radiation Theory of Chemical Activation by Lewis G.N., Mayer J.E.


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