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在CaCl2熔盐中,以Co3O4和CeO2混合氧化物为原料,采用熔盐电脱氧法制备CeCo5合金。研究电解电压、烧结温度等对电脱氧过程的影响。采用SEM和XRD对不同条件下制备的产物微观形貌和相组成进行表征,并结合动电位极化法,研究电脱氧机理。采用循环伏安法研究材料的电化学性能。结果表明:随着电解电压的升高和烧结温度的降低,电脱氧速度逐渐加快。在850°C下烧结的混合氧化物试样,在3.1V电压下电解,可制备出纯相的CeCo5合金。在电脱氧过程中,Co3O4还原成单质Co,CeO2还原成CeOCl,CeOCl在单质Co表面还原而形成CeCo5合金。所制备的合金表现出良好的电化学循环稳定性。
In CaCl2 molten salt, Co3O4 and CeO2 mixed oxides as raw materials, the use of molten salt deoxidation CeCo5 alloy preparation. The effects of electrolysis voltage and sintering temperature on the deoxygenation process were studied. The morphology and phase composition of the products prepared under different conditions were characterized by SEM and XRD, and the mechanism of electro-deoxidation was studied in combination with the kinetic potential polarization method. The electrochemical properties of materials were studied by cyclic voltammetry. The results show that the rate of deoxidation increases with the increase of electrolysis voltage and sintering temperature. At 850 ° C under the mixed oxide sample sintered at 3.1V voltage electrolysis, can be prepared pure phase CeCo5 alloy. In the electro-deoxidation process, Co3O4 is reduced to elemental Co, CeO2 is reduced to CeOCl, and CeOCl is reduced on the surface of elemental Co to form a CeCo5 alloy. The prepared alloy shows good electrochemical cycling stability.