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在CaCl2熔盐中,直接从TiO2和Fe2O3的混合阴极电解还原制备了TiFe合金.在1173 K和3.1 V电解条件下,电解10 h后可制得含氧量(质量分数)为0.43%的TiFe.电解过程可以大致分为两个阶段:反应初期铁优先于钛还原出来,钛元素则以CaTiO3的形式存在;随着电解的进行,电极的外层首先被还原为TiFe,同时电极出现分层现象,外层为疏松的TiFe相,内层则较为致密,主要由Fe和CaTiO3组成.由电解制备的TiFe无须活化,经电化学性能测试,放电容量为33 mA.h.g-1,优于传统方法制备的TiFe合金.
In CaCl2 molten salt, the TiFe alloy was prepared directly from the cathode of TiO2 and Fe2O3 mixed electrolytes, TiFe alloy with oxygen content (mass fraction) of 0.43% can be obtained after electrolysis at 1173 K and 3.1 V for 10 h The electrolysis process can be roughly divided into two stages: in the early stage of reaction, iron is preferentially reduced from titanium and titanium is present in the form of CaTiO3; as the electrolysis proceeds, the outer layer of the electrode is first reduced to TiFe and the electrode delaminates Phenomenon, the outer layer is loose TiFe phase, the inner layer is more dense, mainly composed of Fe and CaTiO3 TiFe prepared by electrolysis without activation, the electrochemical performance test, the discharge capacity of 33 mA.hg-1, better than the traditional TiFe alloy prepared by the method.