| abstract |
An object of the present invention is to provide an oxygen reduction catalyst having a high catalytic activity and a high durability using a transition metal (such as titanium) and a method for producing an electrode catalyst for a fuel cell using the same. The present invention relates to an XRD measurement method using X-ray diffraction (XRD) measurement using a Cu-K? Ray as a constituent element in a specific ratio of titanium, carbon, nitrogen and oxygen, ° and each of maximum peak intensity in the 27 ° to 28 °, which accounts for each of areas a-D, at least the area a and the areas a-D with the box, each peak in the B of the I a, I B, I C and I D is and provides I a> I B, and 0.3≤ (I a / (I a + I C + I D)) oxygen reduction catalyst at the same time satisfying the relation of ≤1. |