High dispersion FeFe2O4 nanoparticles catalyst for oxygen reduction is synthesized by hydrothermal reaction and pyrolysis. The as‐prepare FeFe2O4‐0.50 might be a potential alternative catalyst for ORR in fuel cell. It was the evenly dispersed FeFe2O4 nanoscale and Fe−O bond in FeFe2O4‐0.50 that contributed its excellent electrochemical performance and tolerance for CO and methanol. In addition, FeFe2O4‐0.50 also showed stronger stability as well as methanol/CO tolerance than that of commercial 20 % Pt/C. RHE), respectively, higher about 20 mV and 1.29 mA cm−2 than that of FeFe2O4 (0.59 V and −0.56 mA V vs. Its half‐wave potential and limiting diffusion current density was 0.61 V and −1.85 mA V vs. The results indicated that, among all the as‐prepared samples, FeFe2O4‐0.50 was mainly composed of uniformly dispersed spherical nanoparticles of 20‐30nm and behaved the best ORR catalytic performance. The formation mechanism of octahedron Fe3O4 particles is also discussed.īy pyrolyzed the products from hydrothermal reaction of 1, 4, 5, 8‐naphthalene tetramethyl anhydride, NaOH and FeSO4, the nanoparticles of FeFe2O4 were produced, and then its electrochemical performance of oxygen reduction reaction (ORR) was evaluated in O2 saturated 0.1 M KOH solution. 165.3 emu g, a remnant magnetisation of ca. The octahedron Fe3O4 particles obtained in 2.0 M NaOH at 150☌ for 12 h show a high-saturation magnetisation of ca. The average diameter of the particles reduces from 20 to 0.5 m by simply changing the concentration of NaOH solution from 0.5 to 2 M. It was found that an increase in the concentration of NaOH solution resulted in a decrease in the average size of Fe3O4 particles. The influence of the concentration of NaOH solution on the size and shapes of the as-prepared Fe3O4 samples has been studied. X-ray diffraction, scanning electron microscopy and vibrating sample magnetometer were used for the structural, morphological and magnetic characterisation of the products, respectively. Monodispersed octahedron Fe3O4 particles have been directly synthesised on a large-area iron substrate using a template-free hydrothermal route.
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