Electrosynthesis of Ti2COn from TiO2/C Composite in Molten CaCl2: Effect of Electrolysis Voltage and Duration
Electrosynthesis of Ti2COn from TiO2/C Composite in Molten CaCl2: Effect of Electrolysis Voltage and Duration
复制标题
熔融 CaCl2 中 TiO2/C 复合材料电合成 Ti2COn：电解电压和持续时间的影响
DOI：
10.1149/2.015311jes
复制
发表时间：
2013
影响因子：
3.9
通讯作者：
Wang, Dihua
中科院分区：
文献类型：
--
作者：
Tang, Dingding;Xiao, Wei;Tian, Longfei;Wang, Dihua
以TiO_2-石墨复合前驱体为原料，在CaCl_2熔盐中电还原，成功地合成了氧含量可控的Ti_2CO_n粉体。系统地研究了电解时间和外加槽电压对产物碳、氧含量的影响。利用X射线衍射（XRD）、扫描电子显微镜（SEM）和X射线光电子能谱（XPS）对中间产物进行分析，研究了复合电极的还原途径。建议还原开始于将TiO 2和石墨转化为CaTiO 3和Ti 2 COn。然后将所得的CaTiO 3还原成CaTiO 4，随后将其还原成Ti 2COn。本发明的石墨显著地加速了TiO 2的电还原。随着电解槽电压的升高和电解时间的延长，氧含量降低。研究发现，为避免最终产品中氧的耗尽，应严格控制电解槽电压和电解时间。所得产物在室温下显示出良好的电子导电性。该工艺对于由TiO 2-石墨复合材料生产Ti 2COn表现出相对较高的电流效率。(C)2013年电化学学会。All rights reserved.
Ti2COn powders with controllable oxygen contents have been successfully synthesized by electro-reduction of solid TiO2-graphite composite precursors in molten CaCl2. The effect of electrolysis time and applied cell voltage on the carbon and oxygen content of the product was systematically investigated. The reduction pathway of the composite electrode was studied based on the analysis of intermediate products using X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). It is suggested that the reduction starts with converting TiO2 and graphite to CaTiO3 and Ti2COn. The resulting CaTiO3 is then reduced to CaTi2O4 which is subsequently reduced to Ti2COn. The present graphite significantly accelerates the electro-reduction of TiO2. The oxygen content decreases with increasing the electrolysis cell voltage and prolonging the electrolysis time. It is found that the cell voltage and electrolysis duration should be strictly controlled to avoid oxygen-depletion in the final product. The obtained product shows good electronic conductivity at room temperature. This process exhibits a relatively high current efficiency for production of Ti2COn from TiO2-graphite composite. (C) 2013 The Electrochemical Society. All rights reserved.
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DOI：
10.1149/1.3159327
发表时间：
2009-08
期刊：
--
影响因子：
--
作者：
O. Kjos;G. Haarberg;A. Martínez
通讯作者：
O. Kjos;G. Haarberg;A. Martínez
熔盐中电解还原固体CaWO4生产细钨粉
影响因子：
3.9
作者：
Tang, Dingding;Xiao, Wei;Yin, Huayi;Tian, Longfei;Wang, Dihua
通讯作者：
Wang, Dihua
DOI：
10.4028/www.scientific.net/kem.436.41
发表时间：
2010-05
期刊：
Key Engineering Materials
影响因子：
--
作者：
A. Martínez;K. S. Osen;E. Skybakmoen;O. Kjos;G. Haarberg;K. Dring
通讯作者：
A. Martínez;K. S. Osen;E. Skybakmoen;O. Kjos;G. Haarberg;K. Dring
影响因子：
2.3
作者：
A. N. Enyashin;A. Ivanovskii
通讯作者：
A. N. Enyashin;A. Ivanovskii
影响因子：
3.7
作者：
R. S. Seth;S. B. Woods
通讯作者：
R. S. Seth;S. B. Woods