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以钛酸正丁酯为钛源、蔗糖为炭源,采用溶胶-凝胶法制得有机-无机复合干凝胶,后经高温炭热反应、氯气化学刻蚀分别得到中孔碳化钛及碳化物基炭材料(CDCs)。通过XRD、Raman、SEM、TEM和氮气吸附等表征,考察了钛酸正丁酯/蔗糖摩尔比例(R)对所制碳化钛和CDCs的孔结构和物理特性的影响。结果表明:在碳热过程所形成的中孔和大孔孔隙能够在氯气刻蚀过程中保持并传递给最终的炭材料。所制CDCs具有三种不同层次的孔隙结构,分别为氯气刻蚀碳化钛晶体所产生的微孔、源自蔗糖残留炭中所含的3nm~4nm中孔以及炭颗粒间相互叠加和连接所形成的大孔。通过改变R比值,所制CDCs的BET比表面积和孔容分别在1479m2/g~1640m2/g和1.06cm3/g~2.03cm3/g之间可调。
Using n-butyl titanate as titanium source and sucrose as carbon source, the organic-inorganic composite xerogel was prepared by sol-gel method. After high temperature carbon thermal reaction and chlorine gas chemical etching, mesoporous titanium carbide and carbide Carbon material (CDCs). The effects of n-butyl titanate / sucrose molar ratio (R) on the pore structure and physical properties of the prepared titanium carbide and CDCs were investigated by XRD, Raman, SEM, TEM and nitrogen adsorption. The results show that the mesopore and macropore pores formed during the carbothermal process can be retained and delivered to the final carbon material during chlorine etching. The prepared CDCs have three different levels of pore structure, namely, the pores generated by the chlorine etching titanium carbide crystal are derived from the 3nm ~ 4nm mesopores contained in the residual carbon of sucrose and the carbon particles are superposed and connected with each other Big hole. By changing the R ratio, the BET specific surface area and pore volume of the prepared CDCs were adjustable between 1479m2 / g ~ 1640m2 / g and 1.06cm3 / g ~ 2.03cm3 / g, respectively.