标题：Electrochemical Synthesis of Nano-Metallic Carbides from the Mixtures of Metal Oxide and Graphite

作者：Fan, JH (Fan, Jinhang); Yang, YJ (Yang, Yijia); Tang, DD (Tang, Dingding); Xiao, W (Xiao, Wei); Mao, XH (Mao, Xuhui); Wang, DH (Wang, Dihua)

来源出版物：JOURNAL OF THE ELECTROCHEMICAL SOCIETY 卷：164 期：7 页码：E144-E150 DOI：10.1149/2.0471707jes 出版年：2017

摘要：Nanocrystalline transition metal carbides (TMCs, M = Ti, Zr, Hf, Nb and Ta) have been synthesized by direct electrochemical reduction of solid mixture precursors composed of transition metal oxides and graphite powder (TMOs-C) in molten CaCl2 at 850 degrees C. The synthesis temperature is much lower than that of the conventional carbothermic reduction process. SEM analysis showed that the particle sizes of the as-prepared TMCs powders were about 15-30 nm. The formation processes of nanocrystalline TMCs monitored by analyzing partially reduced samples were confirmed to be similar to each other and could be divided into three steps: TMOs-C first to CaMaOb and MCxOy, then to pure MCxOy and last to MC. It has been found that the electrolysis production of (TMCs)-Cs-V is much faster than that of (TMCs)-Cs-IV. The formation of intermediate MCxOy during the electrolysis processes was investigated and their stability should be the key influence factor of the electro-deoxidation rate of the mixtures. (C) 2017 The Electrochemical Society.

入藏号：WOS:000404397300108

文献类型：Article

语种：English

扩展关键词： CHEMICAL-VAPOR-DEPOSITION; MOLTEN CALCIUM-CHLORIDE; NANOCRYSTALLINE TITANIUM CARBIDE; NIOBIUM CARBIDE; LOW-TEMPERATURE; CARBOTHERMAL SYNTHESIS; TIC POWDERS; SOLID NB2O5; REDUCTION; PRECURSORS

通讯作者地址：Wang, DH (通讯作者),Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.

电子邮件地址：wangdh@whu.edu.cn

地址： [Fan, Jinhang; Yang, Yijia; Tang, Dingding; Xiao, Wei; Mao, Xuhui; Wang, Dihua] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.

研究方向：Electrochemistry; Materials Science

ISSN：0013-4651

eISSN: 1945-7111

影响因子：3.259