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Cathode electrodes used in chlor-alkali electrolyzers are usually made of carbon steel in diaphragm cells and nickel in membrane cells. A detailed examination of the cell voltage contributions shows a considerable impact of cathode overvoltage, influenced mainly by the electrode material and the operating current density. Commercialization of DSA anodes worldwide and increasing energy prices, provided impetus in “hydrogen evolution” applications to develop materials such as mixed oxides and high surface – high performing nickel based electrodes as cathodes to reduce energy consumption.