Large-scale solar water decomposition hydrogen production method based on photocatalysis - photoelectrocatalysis

The invention provides a high-efficiency large-scale solar water decomposition hydrogen production technique based on photocatalysis - photoelectrocatalysis. The technique comprises the following steps that soluble high-valence electron carriers are converted into low-valence electron carriers by a powdered photocatalyst under illumination of the sun, so that large-area solar storage is realized, besides, oxygen is emitted, and protons are generated; an electrolyte solution storing the electron carriers and the protons is conveyed into a photoelectrocatalysis basin; and a photon-generated carrier is generated at the anode of the photoelectrocatalysis basin by utilizing the sunlight, so that the low-valence electron carriers are oxidized into the high-valence electron carriers, and protons are combined at the cathode of the photoelectrocatalysis basin to generate hydrogen. After the hydrogen is collected, the electrolyte solution is returned to a photocatalysis system for recycling. The whole reaction is drive