| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a highly active electrode catalyst which is obtained by using materials comparatively inexpensive and comparatively large in resource quantities and which is used at a high electrical potential in an acidic electrolyte. <P>SOLUTION: The electrode catalyst comprises: a metal compound containing at least one kind of metal element, selected from the group consisting of a group 4 element and group 5 element in the long-form periodic table, and an oxygen atom; and a carbonaceous material covering at least a part of the metal compound. The electrode catalyst has: an oxygen deficiency index of 0.125 to 0.170, wherein the oxygen deficiency index is represented in terms of the inverse number of the peak value of the first nearest neighbor element in the radial distribution function obtained by Fourier-transforming the EXAFS oscillation of the metal element as observed in EXAFS measurement; and a crystallinity index of 4.5 to 8.0, wherein the crystallinity index is represented in terms of the peak value of the second nearest neighbor element in the radial distribution function. <P>COPYRIGHT: (C)2012,JPO&INPIT |
