Electrochemical preparation of cuprous o

This study investigates the anodic dissolution of copper in an alkaline sodium chloride solution as a preferred method for producing cuprous oxide powder. The principal electrode reactions involve the formation of cuprous chloride and the generation of hydrogen gas while maintaining specific alkalinity conditions. The research employs linear sweep voltammetry to systematically explore various variables including concentrations of sodium chloride and sodium hydroxide, solution temperatures, and the effects of different additives aimed at enhancing the electrochemical process. Findings reveal optimal operating conditions at temperatures of 80–85°C, sodium chloride concentrations ranging from 240 to 260 g l⁻¹, and sodium hydroxide kept below 1 g l⁻¹. Guidelines are established regarding the use of additives, such as calcium gluconate and specific inorganic compounds, to ensure effective production while minimizing the presence of carbonate ions. The presence of these ions should be controlled to below 0.25 g l⁻¹ Na₂CO₃ to prevent interference during the electrolysis. Overall, the electrochemical approach stands out for its economic feasibility and ability to produce high-quality cuprous oxide efficiently.