NOVELTY - A device for water electrolysis, comprises: an oxygen electrode, a hydrogen electrode, and a hydroxide-exchange membrane arranged so that hydroxide ions produced at the hydrogen electrode by reducing water pass through the hydroxide-exchange membrane for reaction at the oxygen electrode.    USE - As a device for water electrolysis which is used for removing CO2, and for reducing oxygen (claimed).    ADVANTAGE - The present device is efficient and cost-effective for removal of CO2 and is easily incorporated into current and future coal-fired power plants.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) water electrolysis involving reducing water at a hydrogen electrode to produce hydroxide ions, passing the hydroxide ions through a hydroxide-exchange membrane, and reacting the passed-through hydroxide ions at an oxygen electrode to produce water and oxygen gas;    (2) removing CO2, involving contacting one side of a facilitated transport membrane with CO2, and releasing CO2 at another side of the membrane, where the membrane comprises an ionomer having basic functional groups;    (3) reducing oxygen, involving either reducing oxygen in the presence of an oxygen reduction reaction catalyst that comprises multiple twinned, crystalline Ag nanowires, each nanowire having a diameter of 25-60 nm; or reducing oxygen in the presence of an oxygen reduction reaction catalyst that comprises platinum-coated palladium nanotubes, where the platinum content of each platinum-coated palladium nanotube is 5-50% of the total mass of the nanotube;    (4) an oxygen reduction reaction catalyst comprising either multiple twinned, crystalline Ag nanowires, each nanowire having a diameter of 25-60 nm; or platinum-coated palladium nanotubes, where the platinum content of each platinum-coated palladium nanotube is 5-50% of the total mass of the nanotube;    (5) a fuel cell comprising the oxygen reduction reaction catalyst; and    (6) preparing (p2) an atomic-sized layer of a metal on a nanotube substrate, involving mixing a nanotube substrate with a solution containing atoms of a coating metal such that a layer of the coating metal is formed, where the layer is 1 to 3 atoms thick.