A photocatalytic power generation system comprising a solar housing, a photoanode, an electrolyte membrane, a cathode, an oxygen diffusion membrane, and an external power generation circuit, wherein: the solar housing comprises an input window transparent to photoanode activating radiation; the solar housing comprises an anode side and a cathode side; the photoanode is positioned within the solar housing at the anode side and is electrically coupled to the external power generation circuit; the cathode is positioned within the solar housing at the cathode side and is electrically coupled to the external power generation circuit; the cathode is structurally configured to receive a hydrogen ion from a proton pathway provided by the electrolyte membrane, receive an oxygen molecule, and combine the hydrogen ion and the oxygen molecule into recombined water via reduction of the hydrogen ion and the oxygen molecule; the electrolyte membrane is positioned between and electrochemically engaged with the photoanode and the cathode forming a photocatalytic cell; the electrolyte membrane is structurally configured to provide a proton pathway between the photoanode and the cathode; the solar housing comprises a closed-loop water chamber containing a gaseous solution comprising water vapor, the chamber having an anode side flow channel positioned at the anode side and a cathode side flow channel positioned at the cathode side; the solar housing comprises a recombined water channel configured to convey the gaseous solution comprising water vapor extending from the anode side flow channel to the cathode side flow channel; the solar housing comprises an oxygen transport channel extending from the anode side flow channel to the cathode side flow channel; the photoanode is structurally configured to receive photoanode activating radiation and, upon exposure to photoanode activating radiation, output an electron receivable by the external power generation circuit and generate an electron hole such that water housed within the closed-loop water chamber oxidizes into a hydrogen ion and an oxygen molecule at the electron hole; and the oxygen diffusion membrane is positioned between the anode side flow channel and the oxygen transport channel and is structurally configured to inhibit recombined water generated at the cathode from flowing from the cathode side flow channel to the anode side flow channel along the oxygen transport channel and permit recombined water generated at the cathode to flow from the cathode side flow channel to the anode side flow channel along the recombined water channel. the solar housing comprises an input window transparent to photoanode activating radiation; the solar housing comprises an anode side and a cathode side; the photoanode is positioned within the solar housing at the anode side and is electrically coupled to the external power generation circuit; the cathode is positioned within the solar housing at the cathode side and is electrically coupled to the external power generation circuit; the cathode is structurally configured to receive a hydrogen ion from a proton pathway provided by the electrolyte membrane, receive an oxygen molecule, and combine the hydrogen ion and the oxygen molecule into recombined water via reduction of the hydrogen ion and the oxygen molecule; the electrolyte membrane is positioned between and electrochemically engaged with the photoanode and the cathode forming a photocatalytic cell; the electrolyte membrane is structurally configured to provide a proton pathway between the photoanode and the cathode; the solar housing comprises a closed-loop water chamber containing a gaseous solution comprising water vapor, the chamber having an anode side flow channel positioned at the anode side and a cathode side flow channel positioned at the cathode side; the solar housing comprises a recombined water channel configured to convey the gaseous solution comprising water vapor extending from the anode side flow channel to the cathode side flow channel; the solar housing comprises an oxygen transport channel extending from the anode side flow channel to the cathode side flow channel; the photoanode is structurally configured to receive photoanode activating radiation and, upon exposure to photoanode activating radiation, output an electron receivable by the external power generation circuit and generate an electron hole such that water housed within the closed-loop water chamber oxidizes into a hydrogen ion and an oxygen molecule at the electron hole; and the oxygen diffusion membrane is positioned between the anode side flow channel and the oxygen transport channel and is structurally configured to inhibit recombined water generated at the cathode from flowing from the cathode side flow channel to the anode side flow channel along the oxygen transport channel and permit recombined water generated at the cathode to flow from the cathode side flow channel to the anode side flow channel along the recombined water channel.