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利用Mg O部分稳定的Zr O2固体电解质管集成构建Pt,O2(air)|Zr O2作参比电极的可控氧流电解池,采用循环伏安、方波伏安、计时电位、恒电位电解等电化学测试技术研究了1673 K高温下Si O2-Ca O-Mg O-Al2O3熔渣中Ni2+的电化学行为.结果表明,O2-在熔渣中的扩散和在Zr O2固体电解质内的电迁移不是熔渣中电活性物质还原的限制性环节,在本实验条件下利用构建的可控氧流电解池研究熔渣中Ni2+的电化学行为是可行的.熔渣中Ni2+在Ir电极上还原到Ni是受扩散控制的一步还原的可逆过程,利用循环伏安和计时电位测试技术所得数据计算得出了含有3%Ni O的熔渣中Ni2+的扩散系数分别为(3.50±0.18)×10-6和(2.80±0.22)×10-6cm2/s,与相关文献结果基本吻合.
A controllable oxygen flow cell with Pt, O2 (air) | ZrO2 as reference electrode was fabricated by using ZrO2 solid electrolyte tube partially stabilized by MgO. The cyclic voltammetry, square wave voltammetry, chronopotentiometry and potentiostatic electrolysis The electrochemical behavior of Ni2 + in Si O2-Ca O-Mg O-Al2O3 slag at elevated temperature of 1673 K was investigated by means of electrochemical measurements. The results show that the diffusion of O2- in slag and the electric charge in Zr O2 solid electrolyte It is feasible to study the electrochemical behavior of Ni2 + in the slag by using the controlled oxygen flow cell under the present experimental conditions, because the migration is not a limiting part of the reduction of electroactive substances in the slag. Ni2 + in the slag is reduced on the Ir electrode To Ni is a reversible process of diffusion-controlled one-step reduction. Using the data obtained from the cyclic voltammetry and chronopotentiometry techniques, the diffusion coefficients of Ni2 + in slag containing 3% NiO were calculated as (3.50 ± 0.18) × 10 -6 and (2.80 ± 0.22) × 10-6cm2 / s, which are in good agreement with the related literatures.