| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide particulate carrying carbon particle which can be used as a replacement of platinum carrying carbon particle or metal platinum particle used generally at present for an electrode catalyst of a fuel cell, capable of drastically reducing the amount of platinum used compared with conventional platinum carrying carbon particles or the like. <P>SOLUTION: Zirconium oxide particulate (yttrium-noble metal-contained zirconium oxide particulate) which contains yttrium and a noble metal element in a crystal lattice made of mainly zirconium oxide is carried by carbon particles, and the total content of the noble metal element is 0.04-0.2 mol% to the total content of the metal elements constituting the yttrium-noble metal-contained zirconium oxide particulate. As a means of manufacturing such particulate carrying carbon particles, a method is adopted in which firstly, a solution containing complex ion of the metals constituting the yttrium-noble metal-contained zirconium oxide particulate is prepared, and then, carbon particles are dispersed in the solution obtained and after having the complex ion of the metals adsorbed to the carbon particles, water and heat treatment is applied. <P>COPYRIGHT: (C)2007,JPO&INPIT |
