High Dispersion FeFe₂O₄ nanoparticles synthesis and its Oxygen Reduction Reaction catalytic performance

Abstract

By pyrolyzed the products from hydrothermal reaction of 1, 4, 5, 8-naphthalene tetramethyl anhydride, NaOH and FeSO 4 , the nanoparticles of FeFe 2 O 4 were produced, and then its electrochemical performance of oxygen reduction reaction (ORR) was evaluated in O 2 saturated 0.1 M KOH solution. The results indicated that, among all the as-prepared samples, FeFe 2 O 4 -0.50 was mainly composed of uniformly dispersed spherical nanoparticles of 20-30nm and behaved the best ORR catalytic performance. Its half-wave potential and limiting diffusion current density was 0.61 V and À 1.85 mA cm À 2 @0.4 V vs. RHE), respectively, higher about 20 mV and 1.29 mA cm À 2 than that of FeFe 2 O 4 (0.59 V and À 0.56 mA cm À 2 @0.4 V vs. RHE). In addition, FeFe 2 O 4 -0.50 also showed stronger stability as well as methanol/CO tolerance than that of commercial 20 % Pt/C. It was the evenly dispersed FeFe 2 O 4 nanoscale and FeÀ O bond in FeFe 2 O 4 -0.50 that contributed its excellent electrochemical performance and tolerance for CO and methanol. The asprepare FeFe 2 O 4 -0.50 might be a potential alternative catalyst for ORR in fuel cell.

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“…19-0629. 23,24 The characteristic diffractions at 30.32°, 35.66°, 43.32°, 53.66°, 57.20°, and 62.76° 2 θ are indexed by their hkl Miller indices (2 2 0), (3 1 1), (4 0 0), (4 2 2), (5 1 1), and (4 4 0), respectively. The major (3 1 1) diffractions (Fig.…”

“…19-0629. 23,24 The characteristic diffractions at 30. 23 Thermal annealing at 1273 K increased the crystallite size of as-synthesized FeFe 2 O 4 from 20.2 to 33.8 nm due to the high-temperature sintering effect.…”

“…23,24 The characteristic diffractions at 30. 23 Thermal annealing at 1273 K increased the crystallite size of as-synthesized FeFe 2 O 4 from 20.2 to 33.8 nm due to the high-temperature sintering effect. The coalesced clusters of FeFe 2 O 4 nanoparticles are seen in the scanning electron micrograph (Fig.…”