Polymer electrolyte fuel cells(PEFCs) have received a great deal of attention in terms of applications in transportation, portable devices and combined heat and power systems based on their high energy conversion efficiency and scalability. One major problem for PEFCs in commercial applications is the cost and scarcity of platinum, which is used as the cathode catalyst for oxygen reduction reaction(ORR). It is extremely important to develop non-precious-metal(NPM) cathode catalysts. Our research group has been developing NPM catalysts prepared by pyrolyzing Fe containing polyimide. This presentation will focus on the recent progress of our catalyst development and the reaction mechanism studied theoretically and experimentally by our collaborators.