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Hybrids of Fe3O4/CoSe2 as efficient electrocatalysts for oxygen reduction reaction
- Huang, Yanli, Feng, Chuanqi, Wu, Huimin, Wang, Shengfu, Wang, Feng, Liu, Huakun
- Journal of materials science 2018 v.53 no.2 pp. 1123-1134
- X-ray diffraction, X-ray photoelectron spectroscopy, catalysts, dielectric spectroscopy, electrochemistry, ethanol, ethylene glycol, hot water treatment, iron oxides, methanol, oxygen, scanning electron microscopy, sulfuric acid, transmission electron microscopy
- Here we demonstrated two different hydrothermal methods for synthesizing Fe₃O₄/CoSe₂ hybrids with different weight ratios of Fe₃O₄ and CoSe₂. The synthesized materials were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. And the electrochemical properties were obtained by linear sweep voltammetry, chronoamperometry and electrochemical impedance spectroscopy. For the first method, the obtained catalyst with loading 20% Fe₃O₄ on CoSe₂ (C20a) exhibits the highest oxygen reduction reaction activity. While for the second method, the obtained catalyst with loading 30% Fe₃O₄ on CoSe₂ (C30b) exhibits the highest oxygen reduction reaction activity, with an onset potential of 0.775 V, a half-wave potential of 0.600 V, and Tafel slope of 65 mV decade⁻¹ in O₂-saturated 0.5 M H₂SO₄. Which are better than those of C20a (0.753, 0.567 V and 67 mV decade⁻¹), CoSe₂ (0.708, 0.560 V and 66 mV decade⁻¹) and Fe₃O₄ (0.700, 0.556 V and 79 mV decade⁻¹). More importantly, C30b shows much higher stability and better methanol, ethanol and ethylene glycol tolerance than other prepared materials.