Electrodeposited Mo-Ni-O Powders

The Mo-Ni-O powders were electrodeposited from two supporting electrolytes, as in the case of Co-Ni system 1 M NHjCl-fO. M NH4OH and 1 M (NH4)2S04 -f 0.7 M NH4OH, with the pH of the solutions being 9.0. 

The polarization curves are presented in Fig. 8.25. As can be seen, the polariza-titm curves characterized by two inflectirMi points (Fig. 8.25a), as in all previous cases, were obtained. It is important to note that the potential of the beginning of 

It should also be mentioned that the current efficiency for alloy electrodeposition in all cases was very low, about 5 %. This could be seen in the inset of Fig. 8.25b for the Ni/Mo ratio 1/3, where the t]i vs. E changes from 17 to 5 % in the region of sharp increase of current density, while at the potentials more negative than the second inflection point (B), the value of % is constant, being about 5 % [1, 14]. 

Three different electrolytes were used for the investigations 0.1 M NiS04-f 1 M (NH4)2SO4-f0.7 M NH4OH + X M Na2Mo04, with x being 0.03 M, 0.1 M, and 

3 Morphology of Mo-Ni-O Powders Electrodeposited from Chloride-Containing Electrolytes 

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It should be emphasized here that most of the phases detected in the recrystallized electrodeposited Mo-Ni-O powders [14, 15] (MoNi4 and M0O3) were also found in as-electrodeposited Mo-Ni-O powders, indicating their formation during the process of alloy electrodeposition. 

Fig. 5.60 SEM and EDS analysis of electrodeposited Mo-Ni-O powders after annealing at 600°C (Reprinted from [122] with the permission of Elsevier.)...

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