ScholarWorks@숙명여자대학교

초록

In this work, the Fe–N/C catalyst and core–shell Fe@SiO2 nanoparticle was synthesized using electron beam (e-beam) irradiation to improve the oxygen reduction reaction activity in the polymer electrolyte membrane fuel cells. The Fe–Nx and Fe cores were synthesized at 80 kGy, and the SiO2 shell was manufactured at 40 kGy using e-beam irradiation. The coordination between Fe and 1,10-phenanthroline was effectively controlled by the molecular structure of bidentate. The material properties of the Fe–N/C catalysts were investigated using transmission electron microscopy (TEM), Inductively coupled plasma mass spectroscopy (ICP-MS), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The pyridinic N % was found to be 63.7% and 66.7% for Fe–N/C and 57Fe–N/C catalysts. Furthermore, the electrochemical properties of the Fe–N/C catalysts were investigated by Linear Sweep Voltammetry (LSV) and cyclic voltammetry (CV). The Fe–N/C catalyst showed higher activity at half-cells in 0.1 M HClO4 solution than the Fe–N/C catalyst synthesized by ultrasonic irradiation. The shell formation of SiO2, which prevents Fe oxidation, was confirmed by EDS mapping in Fe@SiO2.

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