Ni/NiFe 2 O 4 Composite Electrode Prepared by Electro-deposition and Its Electro-catalytic Performance Towards Oxygen Evolution Reaction
Ni/NiFe 2 O 4 Composite Electrode Prepared by Electro-deposition and Its Electro-catalytic Performance Towards Oxygen Evolution Reaction
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DOI：
10.3724/sp.j.1095.2013.20385
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发表时间：
2013-01
期刊：
影响因子：
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通讯作者：
王丽品 王森林 段钱花;Wang Senlin Duan Qianhua Wang Lipin-Wang-Senlin-Duan-Qianhua-Wang-Lipin-114028374
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文献类型：
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作者：
王丽品 王森林 段钱花;Wang Senlin Duan Qianhua Wang Lipin-Wang-Senlin-Duan-Qianhua-Wang-Lipin-114028374
采用氢氧化物共沉淀法合成了尖晶石型NiFe2O4粉末，在瓦特镀镍中添加适量NiFe2O4粉末，采用电沉积法制备了Ni/NiFe2O4复合镀层。通过改变镀液pH值、阴极电流密度等参数，研究了复合电沉积的优化镀层条件。 jk.采用扫描电子显微镜(SEM)、能谱X射线衍射(XRD)和色散谱仪(EDS)对Ni/NiFe2O4复合镀层的成分和结构进行了表征。结果表明,优化镀敷条件为溶液pH=5.8～6.0、pH=5.8～6.0时,Ni/NiFe2O4复合镀层中NiFe2O4质量含量最高(55.15%)。 阴极电流密度jk = 40 × 10-3 ～ 60 × 10-3 A/cm2。在5 mol/L KOH溶液中，采用循环伏安法、稳态极化法和计时电流法研究了Ni/NiFe2O4复合电极对析氧反应（OER）的电催化性能。与镍电极相比，电催化性能 Ni/NiFe2O4电极的OER较高，表观活化能降低了62.07 kJ/mol，比表面积是镍电极的23.02倍。长时间的恒电位电解OER表明Ni/NiFe2O4复合电极稳定性良好。
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.