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AFCs were the widely used fuel cells in space industry. Alkaline fuel cell is also called as “Bacon fuel cell” as it was invented by Francis Thomas Bacon. It is one of the considered fuel cell design. It is similar to PEM fuel cell except for the use of alkaline membrane instead of acid membrane. It uses a solution of potassium hydroxide in water as the electrolyte and non-precious metal as a catalyst at the anode and cathode. It uses hydrogen as fuel and pure oxygen to produce water and electricity. Because of its efficiency greater than 60%, it is used in space industries.