Chronopotentiometric study of CuO in aqueous and nonaqueous solvents

Abstract

Chronopotentiometry technique was employed to study the nature of CuO leaching in various solvent systems. Chronopotentiometry curves were obtained using a carbon paste electrode as the working electrode. The potential-time curve was obtained applying a constant potential of 2V and varying the current from 10 x 10-6A to 200 x 10-6A. The slope of the curves varied between -4.27 at 10 x 10-6A to -29.63 at 50 x 10-6 A to -5.85 V/s at 200 x 10-6A. Correlation values obtained were between -0.972 to -0.948. For the chronopotentiometric curve at a particular current density, the it1/2 term becomes independent of further change in current value. This indicates that copper oxides dissolution is controlled by solid-state diffusion.