The effect of iron oxide concentration on the conductive behavior of a molten oxide electrolyte has been investigated at 1823 K using stepped linear scan voltammetry. To maximize the current flow through the electrolyte the ohmic drop in the cell was minimized by shortening the electrode distance. The acquired current was then interpreted by means of an ohmic drop correction, taking into account the conductivity of the alumina-silicate electrolyte and the geometrical form factor of the cell. Via this methodology, a mass transfer limitation in dependence of the iron oxide concentration was identified. This mass transfer limitation vanishes above 7 wt pct of iron oxide where charge transfer starts to be limited solely by electrochemical reaction kinetics. In the analyzed range of concentration, an impact of iron oxide on electronic conduction was not measurable. In addition to these findings, the faradaic yield of the anode half-reaction was determined by the life-measure of O 2 -production. Hereby, a domain of an anodic yield close to 100 pct for various iron oxide concentrations was identified. Based on these findings, suitable conditions for the electrochemical production of liquid iron were determined.

中文翻译：

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氧化铁浓度对用于生产液态铁金属的熔融氧化物电解质性能的影响

已使用阶梯线性扫描伏安法在 1823 K 下研究了氧化铁浓度对熔融氧化物电解质导电行为的影响。为了使通过电解质的电流最大化，通过缩短电极距离来最小化电池中的欧姆降。然后通过欧姆降校正来解释获得的电流，同时考虑到铝硅酸盐电解质的电导率和电池的几何形状因子。通过这种方法，确定了依赖于氧化铁浓度的传质限制。这种传质限制在氧化铁的 7 wt% 以上消失，其中电荷转移开始仅受电化学反应动力学的限制。在分析的浓度范围内，氧化铁对电子传导的影响无法测量。除了这些发现之外，阳极半反应的法拉第产率由O 2 产生的寿命测量确定。因此，确定了对于各种氧化铁浓度的阳极产率接近 100%的区域。基于这些发现，确定了电化学生产铁水的合适条件。