应用化学

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复合电沉积制备Ni/NiFe2O4电极及其电催化析氧性能

王丽品,王森林*,段钱花   

  1. (华侨大学材料科学与工程学院应用化学系 厦门 361021)
  • 收稿日期:2012-08-31 修回日期:2012-10-11 出版日期:2013-06-10 发布日期:2013-06-10
  • 通讯作者: 王森林,教授; Tel:0595-22693746; Fax:0592-6162221; E-mail:slwang@hqu.edu.cn; 研究方向:应用电化学及金属表面处理

Ni/NiFe2O4 Composite Electrode Prepared by Electro-deposition and Its Electro-catalytic Performance Towards Oxygen Evolution Reaction

WANG Lipin, WANG Senlin*, DUAN Qianhua   

  1. (Department of Applied Chemistry,College of Materials Science and Engineering,
    Huaqiao University,Xiamen 361021,China)
  • Received:2012-08-31 Revised:2012-10-11 Published:2013-06-10 Online:2013-06-10

摘要: 采用共沉淀法制备尖晶石型NiFe2O4粉体,然后将其加入瓦特镀镍液中,采用复合电沉积制备Ni/NiFe2O4复合电极。 通过改变镀液的pH值、阴极电流密度jk等条件,探索最佳工艺条件。 运用扫描电子显微镜(SEM)、能谱分析(EDS)和X射线衍射仪(XRD)表征粉体以及复合电极的组成和结构。 结果表明,在镀液pH值为5.8~6.0、jk为40×10-3~60×10-3 A/cm2条件下,所得复合电极中NiFe2O4的质量分数最高可达55.15%。 采用循环伏安、稳态极化以及恒电势阶跃,研究了电极在5 mol/L KOH溶液中的电催化析氧性能。 与Ni电极对比,Ni/NiFe2O4复合电极的电催化析氧性能更好,比表面积是镍电极的23.02倍,表观活化能降低了62.07 kJ/mol。 恒电势长时间电解析氧实验表明,Ni/NiFe2O4复合电极在碱性介质中具有较高的析氧稳定性。

关键词: 复合电沉积, Ni/NiFe2O4, 析氧反应, 电催化

Abstract: The spinel-type NiFe2O4 powders have been synthesized by a hydroxide co-precipitation method. The Ni/NiFe2O4 composite coating was prepared through electro-deposition in Watt nickel plating by adding some NiFe2O4 powders. The optimized plating conditions for the composite electro-deposition were investigated by varying parameters, such as the plating solution pH and the cathode current density jk. The composition and structure of the Ni/NiFe2O4 composite coating were characterized by scanning electron microscopy(SEM), energy X-ray diffraction(XRD) and dispersive spectrometer(EDS). The results show that the NiFe2O4 mass content in the Ni/NiFe2O4 composite coating is the highest(55.15%) at optimized plating conditions of a solution pH=5.8~6.0 and a cathodic current density jk=40×10-3~60×10-3 A/cm2. In 5 mol/L KOH solution, the electro-catalytic properties towards the oxygen evolution reaction(OER) of the Ni/NiFe2O4 composite electrode was studied using cyclic voltammetry, steady-state polarization, and chronoamperometry. Compared with the nickel electrode, the electro-catalytic properties towards OER of the Ni/NiFe2O4 electrode is higher and the apparent activation energy is decreased by 62.07 kJ/mol, and its specific surface area is 23.02 times as large as that of the nickel electrode. The constant-potential electrolysis with long time for OER shows that the stability of the Ni/NiFe2O4 composite electrode is good.

Key words: Composite electro-deposition, Ni/NiFe2O4, Oxygen evolution reaction, Electro-catalysis

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