2020 年 84 巻 6 号 p. 177-189
The solution-based electrochemical process has long been widely used in various fields, such as electroplating metals, metal oxides, and compound layers in mechanical, anti-corrosion, electrical, electronics and energy applications. This process encompass oxidation-reduction reactions, acid-base reactions, and ligand-exchanging reactions relating to the equilibrium potential, solution pH, and stability constant. Here, techniques used in various calculations for the equilibrium potential, pH, soluble species ratio, potential-pH diagram, and solubility curves were described based on thermodynamics, including the chemical potentials of chemical substances and the stability constants of metal complexes. The practical aspects of these calculations were discussed in the electrochemical and chemical preparations of metal compound precursors, metal oxide and hydroxide layers, and the CuO/Cu2O bi-layers for solar cells and photocathode applications.
