Although Polymer electrolyte fuel cells (PEMFCs) have attracted considerable attention as a next generation energy converter, there are several obstacles for their wide-spread applications. One of them is their high manufacturing cost, which results from the usage of large amount of Pt-based electrocatalyst for oxygen reduction reaction (ORR). This can be mitigated by enhancing the ORR performance of Pt-based catalysts. In this study, the carbon-supported Pt catalysts with transition metal (TM) nitride cores (NiN@Pt and CoN@Pt)were synthesized by a galvanic reaction between Pt ions and TM on the surface of TM nitrides. A variety of preparation conditions were applied in order to investigate the effect of catalyst morphology on the ORR performance of prepared catalysts. Compared to a commercial Pt/C, both series catalysts showed higher ORR performance. Among the catalysts prepared, CoN@Pt showed highest specific ORR activity, which was 4.4 times higher than that of Pt/C.