CaCl_2熔盐中自烧结电解制备碳化钒及其机制  

Preparation and the Reaction Mechanism of Vanadium Carbide by Electrochemical Reduction of the Cathode Self-sintered in Molten CaCl_2 Salt

作　　者：郎晓川[1] 谢宏伟[1] 翟玉春[1] 邹祥宇[1] 

机构地区：[1]东北大学,辽宁沈阳110819

出　　处：《稀有金属材料与工程》2014年第10期2515-2519,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51204039)

摘　　要：以氧化钒和石墨粉为原料,采用聚乙烯醇粘接制备阴极片。以光谱石墨棒为阳极,阴极片在800℃氯化钙熔盐中自烧结,恒电压3.2 V下,通过熔盐电解法制备碳化钒。结果表明:粘接的阴极片强度满足熔盐电解的要求,通过熔盐电解,不仅完成阴极片自烧结的过程,并制备出组分单一的碳化钒粉体。通过不同电解阶段产物的物相及循环伏安曲线对反应机制进行研究的结果表明:碳化钒的形成过程为3步反应:V5++(C)→V3++(C)→V2++(C)→V(Cx)。The V2O5,C powder and polyvinyl alcohol were mixed in a certain ratio and then pressed to form pellets.The pellets of the V2O5-C mixtures were self-sintered,and were directly electrochemically reduced to vanadium carbide at the same time in molten CaCl2 at 800 oC and 3.2 V with a graphite anode.The results show the bonding strength of the V2O5-C mixtures can meet the cathode pellet requirement when electrolyzing.High purity vanadium carbide powder with the excellent sintering nature is obtained.The results of the cyclic voltammetry measurement and the XRD analysis reveal that the reaction mechanism of vanadium carbide by the direct electrochemical reduction is three steps,V5＋＋（C）→V3＋＋（C）→V2＋＋（C）→V（Cx）.

关 键 词：熔盐电解 碳化钒 循环伏安法 自烧结 机制 

分 类 号：TQ135.11[化学工程—无机化工]