This invention could be used to make high performance PEM fuel cell catalyst. PEM fuel cell have variety application potentials such as fuel cell electric cars, back up power for remote communication tower and other stationary application. This invention fulfills the needs of high performance fuel cell catalyst with high Pt surface area and Pt loading. Compared with existing Pt/C catalyst, the Pt mass activity of catalyst made by this invention is 13 times higher, Pt loading could be controlled in a much wider range, Pt surface area could be much higher. It may also be used to make other core/shell structure with variety application potentials in catalysis.