Abstract
The physicochemical properties of urea-salt based melts such as the 66.7-33.3 mol % mixture of urea and choline chloride are com-parable to those of many room-temperature ionic liquids. Copper (I) oxide dissolves in this melt to form complex ions. The standard heterogeneous rate constants and transfer coefficients for the Cu(I)/Cu(II) and Cu(I)/Cu(0) electrode reactions were determined in this melt at both glassy carbon and platinum electrodes by using cyclic and rotating disk electrode voltammetric methods. The elec-trodeposition of copper was investigated on glassy carbon by using chronoamperometry. Comparison of the dimensionless data with the corresponding theoretical models for three-dimensional nuclea-tion indicated that the copper nucleation process was intermediate between the limiting cases for instantaneous and progressive nuc-leation. This suggests that nucleation of copper on glassy carbon proceeded at a finite number of active sites.
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