OPTICAL SEMICONDUCTOR ELECTRODE, AND WATER PHOTOLYSIS METHOD USING PHOTOELECTROCHEMICAL CELL PROVIDED WITH SAME

摘要

In order to improve hydrogen generation efficiency, an optical semiconductor electrode with high quantum efficiency, and a water photolysis method using a photoelectrochemical cell provided with said optical semiconductor electrode are provided. This optical semiconductor electrode (200) is provided with a conductive substrate (102), a first semiconductor photocatalytic layer (202) formed on the surface of the conductive substrate (102), and a second semiconductor photocatalytic layer (202) formed on the surface of the first semiconductor photocatalytic layer, wherein the optical semiconductor electrode (200) has multiple columnar projections on the surface, and the surface of the columnar projections is formed from the second semiconductor photocatalytic layer (202).