Manufacturing method of photocathode for producing hydrogen using photoelectrochemical water splitting

摘要

The present invention is a method of manufacturing a material used as a photoelectrode for hydrogen production using photoelectrochemical water decomposition, preparing a Si wafer, coating a spherical polymer bead on top of the Si wafer, and plasma treatment Reducing the size of the polymer beads coated on the Si wafer; depositing a precious metal on the Si wafer coated with the reduced size polymer beads; and removing the polymer beads to form a precious metal pattern made of the precious metal. A step of forming, etching the Si wafer using the noble metal pattern as an etching catalyst to form Si nanowires on the Si wafer, removing the noble metal pattern, and Si formed on the Si wafer The nano-wire is used as a sacrificial material to perform a galvanic substitution reaction, so the Si nano-wire has branches Is a step of changing to a chalcogen nanowire, and a step of chemically reacting the result of the galvanic substitution reaction to cause the chalcogen constituting the chalcogen nanowire to be converted into a chalcogen compound and cation exchange of the reaction result of the topochemical reaction. It relates to a method of manufacturing a photocathode for hydrogen production comprising the step of causing the chalcogenide compound to be converted to chalcogenide by reacting. According to the present invention, since it is made of a nanostructure in the form of a nanowire having branches and made of a chalcogenide material having a band gap suitable for a visible light absorption rate, it has a high specific surface area, thereby improving the efficiency of hydrogen production by sunlight.