采用交流阻抗谱技术研究了Nb2O5的电脱氧机理.Nb2O5的电脱氧过程的交流阻抗谱的响应规律和中间产物表明,Nb2O5的电脱氧反应是分三步逐级进行的:第一步是Nb2O5得到电子还原为低价氧化物NbO2,交流阻抗谱表现为高频半圆;第二步是NbO2得到电子还原为NbO,交流阻抗谱出现第二个响应半圆;第三步是NbO还原为金属Nb,交流阻抗谱在低频端出现第三个响应半圆.用等效电路拟和交流阻抗谱,得到了脱氧反应的电荷传递电阻及其活化能.电荷传递电阻和活化能均随着阴极电势的增加而降低.
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