How did Henri Moissan isolate fluorine in 1886?

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In 1886, the French chemist Henri Moissan successfully isolated fluorine by performing electrolysis on a solution of potassium hydrogen fluoride in hydrogen fluoride.12

Prior to this achievement, the isolation of fluorine had been a long-standing challenge in inorganic chemistry due to the element's extreme reactivity and toxic nature. For his successful isolation of the element and his later work with the electric furnace, Moissan was awarded the Nobel Prize for Chemistry in 1906.21