Heroult

Paul-Louis-Toussaint Héroult was a French chemist who co-developed the Hall–Héroult process, the major industrial method for extracting aluminum from its oxide by electrolysis.

As part of his work in the 1880s, Héroult independently conceived and demonstrated in 1886 that aluminum could be produced by electrolyzing alumina dissolved in molten cryolite. This method uses an electrolytic cell operated at high temperature with carbon electrodes to yield aluminum metal at the cathode and oxygen at the anode.

Developed in parallel with Charles Martin Hall in the United States, the Hall–Héroult process dramatically lowered the cost of aluminum and enabled its widespread commercial use. The invention transformed aluminum from a costly material into a broadly available commodity and remains the standard method for large-scale production.

Today, Héroult's name is attached to the process he helped develop, which is credited alongside Hall's for shaping modern metallurgy and manufacturing. The Hall–Héroult process continues to be the dominant technique for producing aluminum worldwide, illustrating the lasting impact of Héroult’s contribution to electrochemistry.