ELECTRODEPOSITION OF ZINC, NICKEL, AND CADMIUM TO GRAPHITE

• Main Author: Indah Pratiwi, Putri
• Format: Theses
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/34107
• Institution: Institut Teknologi Bandung

Electrodeposition is a process to collect precipitate on cathode by electrolysis. The idea of this method is reduction of metal ion in the electrolyte and its deposition onto cathode material. Electrons flow to the cathode and reduce ions around the cathode to zero oxidation number, i.e precipitate.. The metal ion in the electrolyte is reduced and precipitate into the cathode. Result of this process is determined by many factors: electrodes' materials, electrolyte, electric current, overpotential, and complex agent. In this experiment, cadmium, nickel, and zinc were deposited onto graphite. Graphite was considered as good material that has high conductivity and is corrosion resistant. GWINSTEK gps-3030D was used as power source (electron source). Cadmium was optimally deposited at 0.1 A in 15 minutes under 0.04 M CdSO4 solution. It is shown by the most efficient electric current measured, 82.61 %. Nickel was deposited 66.31 % efficient at 0.05 A in 30 minutes under 0.1 M NiSO4 solution and zinc was deposited 49.19 % efficient at 0.05 A in 30 minutes under 0.02 M ZnCl2 solution. Potentiometry shown that the potential of galvanic cell corresponded the -logarithm of solution concentration of the cell's electrolytes.