PEROVSKITE TYPE OXIDE PARTICULATE, PEROVSKITE TYPE OXIDE CARRYING PARTICLE, CATALYST MATERIAL, CATALYST MATERIAL FOR OXYGEN REDUCTION, CATALYST MATERIAL FOR FUEL CELL, AND ELECTRODE FOR FUEL CELL

摘要

PROBLEM TO BE SOLVED: To provide catalyst for an electrode using none other than metal oxide particles capable of being used as a substitute of platinum-carrying carbon particles or metal platinum particles with a possibility of greatly reducing a volume of use of platinum.

SOLUTION: The transition metal oxide particulates having a perovskite structure expressed in a general formula of ABO3as a main phase is structured with a lattice constant satisfying a conditional expression of: 1.402<2b/(a+c)<1.422. Here, in the conditional expression, a and c denote a length of each minor axis of perovskite type crystal lattices, and b denotes a length of a major axis. Further, in the general formula, A denotes one or more elements selected from lanthanum, strontium, cerium, calcium, yttrium, erbium, praseodymium, neodymium, samarium, europium, silicon, magnesium, barium, niobium, lead, bismuth, and antimony, and B denotes one or more elements selected from iron, cobalt, manganese, copper, titanium, chromium, nickel, and molybdenum.

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