چكيده فارسي :
Nowadays, Feul cells are technology that have major potential to develop renewable energy. The bottleneck of this technologies lies in the high expense of platinum group metal (PGM) electrocataysts for catalyzing the oxygen reduction reaction (ORR) at the cathode [1]. with plan on this issue, transition-metal and nitrogen codoped nanocarbons (TM-N-C, TM: Fe, Co, Ni, Cu, etc.) are inseparable part of researches on ORR electrocatalysts because of their outstanding electrocatalytic activity, superior electrochemical stability, and methanol tolerance. Fuel cells are the suitable items to be a promising vehicle of energy generation. Recently, one of the most promising candidates to replace commercial catalyst (Pt/C) in cathode is using metal organic frameworks, where metal and nitrogen embedded in carbon matrix are regarded active site for oxygen reduction reaction . However, the high temperature will reduce the amount of heteroatoms doping (e.g., nitrogen), which decreases the number of active sites. Therefore, the determination of a suitable temperature is a key factor to prepare the high efficient porous carbon catalysts derived from different MOF precursors [2]. Herein, we report the preparation of ultraSonic Fe nanoparticles embedded in nitrogen-doped by direct pyrolysis of Fe-based zeolitic imidazolate frameworks (Fe-ZIF) at 1000 oC in Ar.
