CARBON CARRIER PLATINUM SKELETON ALLOY ELECTRODE CATALYST HAVING VACANCY TYPE LATTICE DEFECT

摘要

PROBLEM TO BE SOLVED: To reairige high activity and long-tern stability by selectively removing a base metal component from an alloy crystal of specific base metal component and platinum to make a skeleton catalyst. SOLUTION: A solid solution body alloy formed of one kind of base metal selected from groups of gallium, vanadium, chromium, manganese, iron, cobalt, nickel, and copper and a platinum is any of irregular face-centered cubic crystal, regular cubic crystal, and a regular tetragonal crystal. While an alloy crystal form is held from such a platinum-base metal alloy, when only the base metal component is removed, a lattice point of a base metal element position becomes vacant, and an alloy having its vacancy type lattice defect, that is, a platinum skeleton alloy can be obtained. As a degree of removing the base metal is higher, the finer alloy is promoted by alloy particle cracking. Although this platinum skeleton alloy crystal has higher degree of platinum content than the solid solution alloy, the original crystal shape is held; therefore, oxygen reduction activity which is higher than that of the solid solution alloy free of the single platinum or vacancy is presented.