Electrochemical Reduction of Tungsten Oxide in LiCl-KCl Molten Salt Eutectic using the Fluidised Cathode Process
Electrochemical Reduction of Tungsten Oxide in LiCl-KCl Molten Salt Eutectic using the Fluidised Cathode Process
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DOI：
10.1016/j.electacta.2016.12.114
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发表时间：
2017-02
影响因子：
6.6
通讯作者：
R. Abdulaziz;L. Brown;D. Inman;P. Shearing;D. Brett
中科院分区：
文献类型：
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作者：
R. Abdulaziz;L. Brown;D. Inman;P. Shearing;D. Brett
研究了利用流态化阴极法将WO_3还原为W金属的过程。伏安法与热力学预测进行了比较，使用了系统的优势图来帮助解释反应机理。主要的还原电位位于−2.14nV与Ag/Ag+之间。通过在恒定电位下进行近乎穷尽的电还原，法拉第电流效率估计为>；82%。金属是以均匀颗粒的形式结合到衬底电极上的，可以周期性地剥落。考察了金属氧化物与盐的摩尔比和流态化条件对工艺的影响。金属氧化物颗粒负载量越大，金属沉积层的生长速度越快，电流‘噪声’越小，而还原速率对Ar搅拌气体进气的流量相对不敏感，直到达到一个极限时，过渡到不同的流动状态可能是反应速率增加的原因。
The electrochemical reduction of WO3to W metal using a fluidised cathode process has been investigated. Voltammetry was compared with thermodynamic predictions using a predominance diagram for the system to help explain the reaction mechanism. The main reduction potential was located to be −2.14 V vs. Ag/Ag+. By performing near-exhaustive electroreduction at constant potential, the Faradaic current efficiency was estimated to be >82%. The metal is produced in the form of homogeneous particles bound to the substrate electrode, which can periodically spall off. The effects of metal oxide-to-salt ratio and of fluidisation conditions on the process were investigated. Higher loading of metal oxide particles resulted in an increase in the rate of metallic deposit growth and less current ‘noise’, while the rate of reduction was relatively insensitive to flow rate of the Ar agitation gas feed, up to a limit where transition to a different flow regime is expected to be the cause of increased reaction rate.