The present invention provides an oxide semiconductor electrode which can
realize a combination of high transparency with large surface area and is
highly responsive to ultraviolet light, as well as to visible light. The
oxide semiconductor electrode comprises a conductive substrate and an
oxide semiconductor layer provided on the conductive substrate. The oxide
semiconductor layer is a porous layer comprising porous titania particles
which have been joined to each other to define interparticulate
communicating pores. Preferably, the pores possessed by the titania
particles per se have a diameter of 10 to 40 nm, the interparticulate
communicating pores have a diameter of 10 to 70 nm, and the titania
particles have an average diameter of 10 to 70 nm.
