Question

For the electrorefining of copper, what is the cathode made up of?

Answer 1

1. For electrorefining or purification of metal, the anode is the impure metal, the cathode is the pure metal, and the electrolyte is the one that contains the metal ions.
2. For the purification or electrorefining of copper, the anode is the impure copper, the cathode is the pure copper and the electrolyte is the Copper sulfate solution($\mathit{C}\mathit{u}\mathit{S}{\mathit{O}}_{\mathbf{4}}$).
3. So, Cathode is made up of pure copper metal.