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Huang, Jian; Du, Kaifa; Wang, Peilin; Yin, Huayi; Wang, Dihua
Electrochimica acta, 05/2021, Letnik: 378Journal Article
•Oxides are electrochemically split to homogeneous FeCoNiCu MEAs and oxygen.•The current efficiency is over 85% with an energy efficiency of 2.9 kWh/kg-MEA.•The compositions and structures of MEAs can be accurately controlled.•The MEA lasts for 10 h without any degradation at 50 mA/cm2 for OERs. The exploitation of facile preparation methods and novel applications of entropy alloys has gained ever-increasing attention in recent years. In this paper, homogeneous FeCoNiCu medium entropy alloys (MEAs) with a face-centered cubic (FCC) structure are prepared by the electrochemical reduction of oxides in molten Na2CO3-K2CO3 using a low-cost Ni10Cu11Fe oxygen-evolution inert anode. The current efficiency reaches 85.3% with a low energy consumption of 2.9 kWh/kg-MEA. At the cathode, Ni acts as a solvent to dissolve other elements and facilitate the formation of the FCC phase, and the co-reduction process enhances the element diffusion rate thereby ensuring the homogeneity of the electrolytic MEAs. In addition, the electrolytic MEAs are pressed into pellet electrodes with an in situ formed oxides layer to catalyze oxygen evolution reactions (OER) in 1.0 M KOH solution. The electrocatalytic activity of the electrolytic MEAs outperforms the commercial IrO2/Ta2O5-Ti electrode, i.e., the overpotential of the electrode is 439 mV at 50 mA/cm2 and the electrode lasts for 10 h without any degradation. Therefore, this paper provides a facile approach to preparing homogeneous MEAs at below 1173 K using oxides feedstock, to accurately controlling compositions and structures of MEAs, and thereby to tailoring functionalities of MEAs. Display omitted
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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