CATALYST FOR FUEL CELLS, ELECTRODE CATALYST LAYER, MEMBRANE ELECTRODE JOINED BODY, SOLID POLYMER TYPE FUEL CELL, METHOD FOR PRODUCING TITANIUM OXIDE FOR CATALYST CARRIERS, AND METHOD FOR PRODUCING CATALYST FOR FUEL CELLS

摘要

The present invention provides a fibrous rutile-type oxide that contains an oxygen atom, a nitrogen atom, and a transition metal atom. The transition metal atom is at least one atom selected from the group consisting of a titanium atom, a tantalum atom, a niobium atom, and a zirconium atom. The rutile-type oxide is represented by the chemical formula MOxNy, where M represents the transition metal atom. In the chemical formula, x satisfies x=2-(y+j) (j≥0).