ISSN:
1572-8838
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Electrical Engineering, Measurement and Control Technology
Notes:
Abstract The stability of nickel chloride and oxide as well as the electrochemical behaviour of the Ni2+ ion have been studied in ZnCl2-2NaCl melts at 450°C by means of X-ray diffractions (XRD), potentiometry, cyclic voltammetry, chronoamperometry and chronopotentiometry. The standard potential of the redox couple Ni(II)/Ni(O) and solubility product of nickel oxide have been determined (E°Ni(s)/Ni(II) = −1.006 ± 0.001 V (against Cl2(1 atm)/Cl−), pKs = 4.8 ± 0.1 in molality scale). These results have allowed the construction of E-pO2− equilibrium diagrams. Nickel (II) reduction is close to the reversibility according to the scheme: $${\text{NiCl}}_{\text{2}} ({\text{solvated}}){\text{ + 2e}}^ - \Rightarrow {\text{Ni(s) + 2Cl}}^ - $$ with a diffusion coefficient, D Ni, close to 3 × 10 −6cm2s−1.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00243343
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