The Formation of Unipositive Nickel by Electrolysis in Concentrated Salt Solutions^1,2

The Anodic Dissolution of Nickel in Acetonitrile

“…However, there are a number of complex compounds containing nickel(I) (1). Ni(I) has also been postulated as an intermediate in the electrodeposition of nickel (2) and anodic dissolution in aqueous systems (3). It has also been indicated that nickel dissolves anodically in acetonitrile to produce a mixture of nickel(I) and (II) (3).…”

Kinetic and electrochemical analysis of Ni(II) reduction at the dropping mercury electrode in the presence of thiourea

“…(10, 11); it has also been postulated by other workers (35). The formulation of the discharge giving the Ni(1) species…”

“…The formal mechanism explaining the appearance of the main wave consists (10,11,34,35) of diffusion and dehydration (acid catalyzed) by partial loss of water molecules of the N~( H~o )~~+ species, and the discharge of Ni(H20),"' species on the DME:…”

The Mechanism of Blackening of Nickel Anodes

“…It is known that these black cathodic plates contain nickel sulfide. Sanborn and Orlemann (6) have shown the formation of an intermediate Ni (I) ion during the electrolytic reduction of Ni (II) in concentrated salt solutions. Therefore it is reasonable to expect that part of the nickel sulfide arises from the above reactions.…”