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TiO2和Fe2O3直接電解還原制備TiFe合金

Direct preparation of TiFe alloy by electrolytic reduction from TiO2 and Fe2O3

  • 摘要: 在CaCl2熔鹽中,直接從TiO2和Fe2O3的混合陰極電解還原制備了TiFe合金.在1173 K和3.1 V電解條件下,電解10 h后可制得含氧量(質量分數)為0.43%的TiFe.電解過程可以大致分為兩個階段:反應初期鐵優先于鈦還原出來,鈦元素則以CaTiO3的形式存在;隨著電解的進行,電極的外層首先被還原為TiFe,同時電極出現分層現象,外層為疏松的TiFe相,內層則較為致密,主要由Fe和CaTiO3組成.由電解制備的TiFe無須活化,經電化學性能測試,放電容量為33 mA·h·g-1,優于傳統方法制備的TiFe合金.

     

    Abstract: TiFe alloy was prepared directly by electrolytic reduction from the mixture of TiO2 and Fe2O3 in molten CaCl2 at 1173 K and 3.1 V. The reduced product was TiFe with an oxygen content of 0.43% in mass fraction after electrolyzing for 10 h. The whole electrolysis process, roughly, includes two periods:the reduction of Fe element and the forming of TiFe. In the initial stage of electrolysis, Fe element is reduced first prior to titanium and CaTiO3 is formed. Then the external cathode is reduced to TiFe. Meanwhile, the cathode is layered:the external loose layer mainly contains TiFe and the inner layer, which is much harder and more compact, chiefly consists of Fe and CaTiO3. Electrochemical behavior test shows that the discharge capacity of TiFe alloy produced by electrolysis without activation is about 33 mA·h·g-1 and TiFe alloy by this performance is better than those prepared by other methods.

     

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