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Two-step hydrothermal preparing nanoflower-like Ni3Fe/Ni3S2 high-efficiency electrocatalysts to enhance oxygen evolution reaction in alkaline media |
CHEN Yuxiang, HE Hanwei |
Powder Metallurgy Research Institute, Central South University, Changsha 410083, China |
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Abstract Ni3Fe/Ni3S2 oxygen evolution catalysts were synthesized by two-step hydrothermal method using Fe(NO3)3·9H2O and Na2S·9H2O as Fe source and S source, respectively, and nickel mesh (NM) as the Ni source and support substrate. The microstructure and morphology of the catalysts were analyzed by XRD, XPS, SEM, and TEM, and the electrochemical properties were tested by an electrochemical workstation. The results demonstrate that the Ni3Fe/Ni3S2 catalyst synthesized by the two-step hydrothermal method has rich three-dimensional nanoflower morphology, which enhances the spatial utilization of the catalyst. Ni3S2 exposes a high refractive index $\{\bar{2}10\}$. crystalline surface, which contributes to the synergistic effect with the (111) crystalline surface of Ni3Fe to enhance the catalytic activity. The oxygen evolution overpotential is 229 mV at a current density of 10 mA/cm2 in 1 mol/L KOH (25 ℃), the overpotential is 335 mV for a current density of 600 mA/cm2 in 5.35 mol/L KOH (80 ℃), and the decay rate of the overpotential is only 2.39% after 6 000 cyclic voltammetry cycles. It demonstrates that the catalyst has good oxygene evolution performance and stability.
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Received: 31 March 2023
Published: 22 November 2023
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