Catalyst coated membranes are thin-film membranes that have been coated with a catalytic material, such as metal or metal oxide, to increase the rate of a chemical reaction. The catalytic coating helps to reduce the amount of energy required for the reaction to occur, allowing for more efficient and cost-effective processes. By reducing the energy required for the reaction, catalyst coated membranes can be used in a variety of applications, such as water treatment, fuel cells, and chemical synthesis.