熔盐电脱氧法制备合金时物质间相互影响的研究进展
发布时间：2018-08-28 10:34
【摘要】：熔盐电脱氧法是一种高温下直接电解金属氧化物制备金属或合金的电化学方法,采用该方法制备合金时,物质间存在先后还原及相互影响。还原顺序主要取决于金属氧化物分解电压的大小,分解电压小的金属氧化物还原更容易,还原速率相对较快,更先完成还原;金属氧化物混合电解相对于各自单独电解的时间均相应缩短,说明在混合烧结、电解过程中物质间产生了相互影响,其相互影响主要有:混合烧结过程中试样的微观形貌(包括颗粒大小、颗粒形貌、试样孔隙率)相对于单独烧结发生改变,同时试样导电性提高;混合电解过程中先还原的金属提高了试样的导电性、降低了后还原金属氧化物的过电位及缩短了后还原金属氧化物的还原路径,掺杂的金属氧化物促进了钙钛矿化中间产物的还原。故今后的研究中应重点关注金属氧化物混合烧结过程中微观形貌变化、变化机制和对电解的影响,及先还原金属对后还原金属氧化物还原路径的影响,从而通过实验调控促进电解效率的提高。
[Abstract]:Molten salt electrodeoxidation is an electrochemical method for the preparation of metal or alloy directly by electrolysis of metal oxides at high temperature. The reduction order mainly depends on the decomposition voltage of metal oxide. The reduction of metal oxide with small decomposition voltage is easier and the reduction rate is relatively fast. The time of mixed electrolysis of metal oxides is shortened relative to that of individual electrolysis, which indicates that in the process of mixed sintering, there is a mutual influence between the matter and each other in the process of electrolysis. The main effects are as follows: the microstructure of the sample (including particle size, particle morphology, sample porosity) is changed compared with the single sintering process, and the electrical conductivity of the sample is improved in the process of mixed sintering. In the process of mixed electrolysis, the first reduced metal improves the electrical conductivity of the sample, reduces the overpotential of the post-reduced metal oxide and shortens the reduction path of the post-reduced metal oxide. The reduction of perovskite intermediate products was promoted by doping metal oxides. Therefore, in the future research, attention should be paid to the change of micromorphology, the mechanism of change and the influence on electrolysis during the process of mixed sintering of metal oxides, and the influence of the first reduction metal on the reduction path of metal oxides. Thus, the electrolysis efficiency can be improved by experimental regulation.
【作者单位】： 重庆大学化学化工学院;
【基金】：国家教育部中央高校基本科研业务费项目(CDJZR10 22 0003)资助
【分类号】：TF111.522
本文编号：2209134
[Abstract]:Molten salt electrodeoxidation is an electrochemical method for the preparation of metal or alloy directly by electrolysis of metal oxides at high temperature. The reduction order mainly depends on the decomposition voltage of metal oxide. The reduction of metal oxide with small decomposition voltage is easier and the reduction rate is relatively fast. The time of mixed electrolysis of metal oxides is shortened relative to that of individual electrolysis, which indicates that in the process of mixed sintering, there is a mutual influence between the matter and each other in the process of electrolysis. The main effects are as follows: the microstructure of the sample (including particle size, particle morphology, sample porosity) is changed compared with the single sintering process, and the electrical conductivity of the sample is improved in the process of mixed sintering. In the process of mixed electrolysis, the first reduced metal improves the electrical conductivity of the sample, reduces the overpotential of the post-reduced metal oxide and shortens the reduction path of the post-reduced metal oxide. The reduction of perovskite intermediate products was promoted by doping metal oxides. Therefore, in the future research, attention should be paid to the change of micromorphology, the mechanism of change and the influence on electrolysis during the process of mixed sintering of metal oxides, and the influence of the first reduction metal on the reduction path of metal oxides. Thus, the electrolysis efficiency can be improved by experimental regulation.
【作者单位】： 重庆大学化学化工学院;
【基金】：国家教育部中央高校基本科研业务费项目(CDJZR10 22 0003)资助
【分类号】：TF111.522
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