氯化钙熔盐中电解-刻蚀制备碳化钛衍生碳研究

doi:10.19964/j.issn.1006-4990.2022-0278

摘要/Abstract

摘要：

在氯化钙熔盐中首先通过电还原高钛渣/碳制备碳化钛，对碳化钛进行电化学刻蚀得到碳化钛衍生碳（TiC-CDC）。研究了熔盐温度对碳化钛产物组成和结构的影响规律，获得制备形貌结构良好的碳化钛前驱体的条件，以便下一步电化学刻蚀。研究结果表明:熔盐温度是重要的影响因素，在较低的温度下反应速率较慢，温度过高则会造成产物烧蚀现象和能源浪费，在950 ℃下得到的产物形貌结构较好。对950 ℃下制备的碳化钛电化学刻蚀18 h，得到无定型碳和有序石墨带结构共存的碳化钛衍生碳，其孔结构主要为微孔，比表面积为327.88 m²/g，证明通过熔盐电还原-刻蚀能够制备出不同结构的碳化物衍生碳。与氯化法相比，该方法更环保，但是刻蚀时间较长，刻蚀效率还有待提高。

关键词: 碳化钛, 碳化钛衍生碳, 高钛渣, 熔盐电还原, 刻蚀

Abstract:

Titanium carbide（TiC） was firstly prepared by electroreduction of high titanium slag/C in CaCl₂ molten salt，and the TiC was electrochemically etched to obtain titanium carbide-derived carbon（TiC-CDC）.The influence law of molten salt temperature on the composition and structure of TiC products was investigated to obtain the conditions for the preparation of TiC precursors with good morphology and structure for the next step of electrochemical etching.The research results showed that the molten salt temperature was an important influencing factor.The reaction rate was slow at lower temperature，while high temperature would cause product ablation and energy waste，and the products obtained at 950 ℃ had better morphological structure.The TiC prepared at 950 ℃ was electrochemically etched for 18 h，and the TiC-CDC with the coexistence of amorphous carbon and ordered graphite band structure was obtained.The pore structure of the product was mainly microporous with a specific surface area of 327.88 m²/g，which proved that the carbide-derived carbon with different structures could be prepared by molten salt electroreduction-etching.It was more environmentally friendly than the chlorination method，but the etching time was longer and the etching efficiency was needed to be improved.

Key words: titanium carbide, titanium carbide-derived carbon, high titanium slag, molten salt electroreduction, etching

中图分类号:

TF19

彭爽, 陈朝轶, 王仕愈, 白杨, 李天培, 顾炜. 氯化钙熔盐中电解-刻蚀制备碳化钛衍生碳研究[J]. 无机盐工业, 2023, 55(3): 78-83.

PENG Shuang, CHEN Chaoyi, WANG Shiyu, BAI Yang, LI Tianpei, GU Wei. Study on preparation of titanium carbide derived carbon by electrolysis-etching in CaCl₂ molten salt[J]. Inorganic Chemicals Industry, 2023, 55(3): 78-83.

图/表 12

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编号	主要元素质量分数/%
编号	O	Mg	Al	Si	Ca	Ti	Mn	Fe
1	40.63	0.31	1.77	2.11	0.41	50.19	1.31	3.27
2	41.82	0.33	1.28	1.61	0.55	49.06	1.33	4.02
3	40.55	0.29	1.32	2.05	0.62	50.12	1.41	3.64
平均	41.00	0.31	1.46	1.92	0.53	49.79	1.35	3.64

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