How did Moissan prepare fluorine? What are the modifications done  to his method?

Moissan first prepared fluorine in 1886 through the electrolysis of anhydrous hydrofluoric acid (HF). He used a platinum electrode and a mixture of potassium bifluoride (KF·HF) as the electrolyte. When an electric current was passed through the electrolyte, it decomposed, producing fluorine gas at the anode and hydrogen ________ _______ _________ ______ ______.
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