Process for producing gas, process for producing acidic water and alkaline water, and apparatus for producing the same

摘要: [PROBLEMS] This invention provides a process for producing gas, which is low in electrode cost and can cause photoelectric chemical reaction at applied voltage, acidic water alkaline water, an apparatus the same. [MEANS FOR SOLVING PROBLEMS] An anode cathode, are immersed aqueous solution electrically connected to each other, provided. The subjected redox produce hydrogen gas from cathode side, or while cathode. At least one of nitride semiconductor photocatalyst represented by AlyGa1-x-yInxN, wherein x-y ≤ 0.45, 0 x 1, y applies voltage across