The copper coulometer is a one of the common application of the copper-copper(II) sulfate electrode. Such a coulometer consists of two identical copper electrodes immersed in slightly acidic pH-buffered solution of copper(II) sulfate. Passing of current through the element leads to the anodic dissolution of the metal on anode and simultaneous deposition of copper-ions on the cathode. These reactions have 100% efficiency over a wide range of the current densities.
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