Titanium substrate material, electrode for water electrolysis, and solid polymer water electrolysis device

Abstract

A titanium substrate material includes: a substrate main body made of a sintered titanium particle body; and a titanium oxide film formed on the substrate main body, wherein a proportion of anatase titanium oxide among titanium oxide constituting the titanium oxide film is 90% or more. It may have a porosity of the substrate main body is within a range of 30% or more and 92% or less. It may have a compressive strength of the titanium substrate is 0.5 MPa or more.

Dependencies are inferred from the claim text.