标题: Electrochemical preparation and homogenization of face-centered FeCoNiCu medium entropy alloy electrodes enabling oxygen evolution reactions
作者: Huang, J (Huang, Jian); Du, KF (Du, Kaifa); Wang, PL (Wang, Peilin); Yin, HY (Yin, Huayi); Wang, DH (Wang, Dihua)
来源出版物: ELECTROCHIMICA ACTA 卷: 378 文献号: 138142 DOI: 10.1016/j.electacta.2021.138142 出版年: MAY 10 2021
摘要: The exploitation of facile preparation methods and novel applications of entropy alloys has gained everincreasing 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/cm(2) 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. (C) 2021 Elsevier Ltd. All rights reserved.
作者关键词: Medium entropy alloy; Molten salt electrochemistry; Oxide reduction; Oxygen evolution reaction; Alkaline solution
地址: [Huang, Jian; Du, Kaifa; Wang, Peilin; Yin, Huayi; Wang, Dihua] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.
[Huang, Jian; Du, Kaifa; Wang, Peilin; Yin, Huayi; Wang, Dihua] Wuhan Univ, Int Cooperat Base Sustainable Utilizat Resources, Wuhan 430072, Peoples R China.
通讯作者地址: Wang, DH (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.
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