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首页> 外文期刊>Applied Nanoscience >The effect of solution pH on the electrochemical performance of nanocrystalline metal ferrites MFe2O4 (M=Cu, Zn, and Ni) thin films
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The effect of solution pH on the electrochemical performance of nanocrystalline metal ferrites MFe2O4 (M=Cu, Zn, and Ni) thin films

机译：溶液pH值对纳米晶金属铁氧体MFe2O4（M = Cu，Zn和Ni）薄膜的电化学性能的影响

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摘要

Nanocrystalline metal ferrite MFe2O4 (M=Cu, Zn, and Ni) thin films have been synthesized via electrodeposition–anodization process. Electrodeposited (M)Fe2 alloys were obtained from aqueous sulfate bath. The formed alloys were electrochemically oxidized (anodized) in aqueous (1?M KOH) solution, at room temperature, to the corresponding hydroxides. The parameters controlling the current efficiency of the electrodeposition of (M)Fe2 alloys such as the bath composition and the current density were studied and optimized. The anodized (M)Fe2 alloy films were annealed in air at 400?°C for 2?h. The results revealed the formation of three ferrite thin films were formed. The crystallite sizes of the produced films were in the range between 45 and 60?nm. The microstructure of the formed film was ferrite type dependent. The corrosion behavior of ferrite thin films in different pH solutions was investigated using open circuit potential (OCP) and potentiodynamic polarization measurements. The open circuit potential indicates that the initial potential E im of ZnFe2O4 thin films remained constant for a short time, then sharply increased in the less negative direction in acidic and alkaline medium compared with Ni and Cu ferrite films. The values of the corrosion current density I corr were higher for the ZnFe2O4 films at pH values of 1 and 12 compared with that of NiFe2O4 and CuFe2O4 which were higher only at pH value 1. The corrosion rate was very low for the three ferrite films when immersion in the neutral medium. The surface morphology recommended that Ni and Cu ferrite films were safely used in neutral and alkaline medium, whereas Zn ferrite film was only used in neutral atmospheres.
机译：通过电沉积-阳极氧化工艺合成了纳米晶金属铁氧体MFe 2 O 4 （M = Cu，Zn和Ni）薄膜。从硫酸盐浴中获得电沉积的（M）Fe 2 合金。在室温下，将形成的合金在（1？M KOH）水溶液中电化学氧化（阳极氧化）成相应的氢氧化物。研究并优化了控制（M）Fe 2 合金电沉积电流效率的参数，如镀液组成和电流密度。阳极氧化的（M）Fe 2 合金膜在空气中于400°C退火2？h。结果揭示形成了三个铁氧体薄膜。所生产的薄膜的微晶尺寸在45至60nm之间。所形成的膜的微观结构取决于铁氧体类型。使用开路电势（OCP）和电势极化测量研究了铁氧体薄膜在不同pH溶液中的腐蚀行为。开路电势表明ZnFe 2 O 4 薄膜的初始电势E im 在短时间内保持恒定，然后急剧上升。与镍和铜铁氧体薄膜相比，在酸性和碱性介质中的负方向更少。 pH为1和12的ZnFe 2 O 4 膜的腐蚀电流密度I corr 的值高于NiFe 2 O 4 和CuFe 2 O 4 仅在pH值为1时较高。腐蚀速率为当浸入中性介质时，对于三个铁氧体薄膜来说，该值非常低。表面形态建议在中性和碱性介质中安全使用Ni和Cu铁氧体膜，而仅在中性气氛中使用Zn铁氧体膜。

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