Space hybrid propulsion system based on technology of photocatalytic water splitting for hydrogen production

The invention relates to a space hybrid propulsion system based on the technology of photocatalytic water splitting for hydrogen production, and aims to solve the problem that in an existing water-based propulsion system, solar arrays are large in size, a proton exchange membrane water electrolytic cell is high in requirements for electrical energy, large in loss of electrical energy and low in hydrogen production efficiency, and the propulsion system is complicated in structure. The space hybrid propulsion system comprises a water storage tank, a photocatalytic water splitting module, a hydrogen and oxygen storage module, a hydrogen and oxygen flow control module, a hydrogen and oxygen engine module and an oxygen cold gas engine module, wherein the photocatalytic water splitting module comprises an electrolytic cell, a proton exchange membrane, a hydrogen production electrode, an oxygen production electrode and a condenser; the proton exchange membrane is arranged in the electrolytic cell; the electrolytic cell is divided into a hydrogen production chamber and an oxygen production chamber by the proton exchange membrane; the hydrogen production electrode and the oxygen production electrode are separately arranged in the hydrogen production chamber and the oxygen production chamber; the condenser is arranged on the oxygen production chamber; the water storage tank is used for supplying water to the photocatalytic water splitting module; the hydrogen and oxygen storage module is used for storing hydrogen and oxygen; and the hydrogen and oxygen are supplied to the hydrogen and oxygen engine module and the oxygen cold gas engine module through the hydrogen and oxygen flow control module.