Why do electrolytic nickel-refining cells use diaphragm compartments?

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In electrorefining, electrolytic cells utilize diaphragm compartments specifically to prevent the migration of impurities from the anode to the cathode. By physically separating these areas, the diaphragm ensures that the nickel deposited onto the pure nickel cathodes remains free from contaminants that are released from the anode during the refining process.1