Abstract: This hydrogen-oxygen reaction device includes a reaction vessel including a reaction region filled with a reaction catalyst which promotes a reaction between hydrogen and oxygen, an introduction portion which introduces an hydrogen-oxygen mixed gas having hydrogen or oxygen as a main component into the reaction vessel, a water vapor pipe of which one end portion is inserted into the reaction vessel and which includes a region in contact with the reaction region with at least a part of the region in contact with the reaction region being formed of a water vapor permeable membrane, a discharge portion through which a gas in the reaction vessel is discharged to an outside, and a cooling portion which cools the water vapor pipe outside the reaction vessel.

Abstract: This hydrogen-oxygen reaction device includes a reaction vessel including a reaction region filled with a reaction catalyst which promotes a reaction between hydrogen and oxygen, an introduction portion which introduces an hydrogen-oxygen mixed gas having hydrogen or oxygen as a main component into the reaction vessel, a water vapor pipe of which one end portion is inserted into the reaction vessel and which includes a region in contact with the reaction region with at least a part of the region in contact with the reaction region being formed of a water vapor permeable membrane, a discharge portion through which a gas in the reaction vessel is discharged to an outside, and a cooling portion which cools the water vapor pipe outside the reaction vessel.

Abstract: A regenerative fuel cell system includes: a fuel cell that causes hydrogen from a hydrogen storage unit and oxygen from an oxygen storage unit to react with each other to generate electricity; a water electrolysis device that electrolyze water discharged from the fuel cell to produce hydrogen and oxygen; a first gas reaction device that causes the hydrogen produced by the water electrolysis device and oxygen accompanying the hydrogen produced by the water electrolysis device to react with each other and return the hydrogen remaining after the reaction to the hydrogen storage unit; and a second gas reaction device that causes the oxygen produced by the water electrolysis device and hydrogen accompanying the oxygen produced by the water electrolysis device to react with each other and return the oxygen remaining after the reaction to the oxygen storage unit.