Electrodeposition of Cobalt‐Aluminum Alloys from Room Temperature Chloroaluminate Molten Salt

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Abstract
The electrochemical reduction of cobalt(II) in the 1.5:1.0 :EMIC (EMIC = 1‐ethyl‐3‐methylimidazolium chloride) room temperature molten salt leads to cobalt metal at potentials positive of +0.4 V and to alloys when the deposition potential is negative of +0.4 V. The value of x in gradually increases up to a value of 2 as the electrodeposition potential (E deposition) decreases; however, plots of x vs. E deposition exhibit sloping plateaus and indicate preferential formation of alloys having integral compositions of and . The formation of these alloys can be interpreted as an underpotential deposition‐based process or as a free energy of alloy formation. Evaluation of the chronoamperometric transient behavior during electrodeposition shows that pure Co deposition proceeds via 3D progressive nucleation with diffusion‐controlled growth. However, as E deposition crosses from Co metal into the alloy‐forming range, the nucleation process exhibits characteristics indicative of kinetic control.

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