On the development of metallic inert anode for molten CaCl2–CaO System
On the development of metallic inert anode for molten CaCl2–CaO System
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DOI：
10.1016/j.electacta.2011.01.026
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发表时间：
2011-03
影响因子：
6.6
通讯作者：
Huayi Yin;Lili Gao;Hua Zhu;X. Mao;F. Gan;Dihua Wang
中科院分区：
文献类型：
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作者：
Huayi Yin;Lili Gao;Hua Zhu;X. Mao;F. Gan;Dihua Wang
从热力学分析、金属电化学和氧化物溶解度测量等方面，研究了钙氧化钙熔液中惰性阳极形成的一些基本问题。首次计算并记录了金属电剥离、金属氧化物电生成、金属氧化物电溶解以及氧和氯析出等关键阳极反应的吉布斯自由能变化，为氯化物熔体中金属惰性阳极的开发提供了参考。研究了典型金属（Ni, Fe, Co, Mo, Cu， Ag和Pt）在熔体中的阳极行为。结果证实了金属在熔体中的热力学稳定顺序，表明在含CaO熔体中，表面氧化物的形成可以提高电极的稳定性。此外，还测定了几种氧化物（NiO, Fe2O3, Cr2O3, Co3O4, NiFe2O4）在纯cacl2或CaCl2-CaO熔体中的溶解度，以评价熔体中氧化涂层或金属陶瓷惰性阳极的稳定性。结果表明，随着CaO浓度的增加，NiO的溶解度降低，fe2o3的溶解度增加。镀有NiO膜的Ni在阳极极化过程中具有更高的稳定性。
Some fundamental aspects related to inert anode development in molten CaCl2–CaO were investigated based on thermodynamic analysis, electrochemistry of metals and solubility of oxide measurements. The Gibbs free energy change of several key anodic reactions including electro-stripping of metals, electro-formation of metallic oxides, electro-dissolution of metallic oxides as well as oxygen and chlorine evolution was calculated and documented, for the first time, as a reference to develop metallic inert anode in chloride based melts. The anodic behaviors of typical metals (Ni, Fe, Co, Mo, Cu, Ag, and Pt) in the melt were investigated. The results confirmed the thermodynamic stability order of metals in the melts and revealed that surface oxide formation can increase the stability of the electrodes in CaO containing melt. Furthermore, solubility of several oxides (NiO, Fe2O3, Cr2O3, Co3O4, NiFe2O4) in pure CaCl2or CaCl2–CaO melts was measured to evaluate the stability of oxide coating or a cermet inert anode in the melt. It was found that the solubility of NiO decreased with increasing CaO concentration, while that of Fe2O3increased. Ni coated with NiO film had much higher stability during anodic polarization.