摘要
利用热处理法通过温度精确控制实现Ti_(3)C_(2)T_(x)的结构调控以提高材料的电容性能。首先,利用TG曲线研究了Ti_(3)C_(2)T_(x)质量随着温度变化的规律,并利用SEM、TEM、XRD和XPS对不同温度热处理后的Ti_(3)C_(2)T_(x)结构及形貌进行分析。结果显示,在热处理温度为200~300℃时,热处理后Ti_(3)C_(2)T_(x)保持较好的二维结构,表面有TiO_(2)纳米颗粒生成,F含量减少;当热处理温度高于300℃时,Ti_(3)C_(2)T_(x)成分减少,二氧化钛(TiO_(2))大量生成并团聚,破坏了材料二维结构。通过电化学性能分析,结果显示在100 mV·s^(-1)的扫速下,经250℃热处理后的Ti_(3)C_(2)T_(x)比电容达到316 F·g^(-1),在电流密度10 A·g^(-1)下,经5000圈循环充放电测试后的电容保持率为78%,热处理后Ti_(3)C_(2)T_(x)的电阻Rs会增加。
In this paper,the effect of heat treatment on the structure and capacitive properties of Ti_(3)C_(2)T_(x)was investigated.Firstly,the temperature-dependent changes of the quality of Ti_(3)C_(2)T_(x)was studied by TG curve,and the structure and morphology of Ti_(3)C_(2)T_(x)after heat treatment at different temperatures were analyzed by SEM,TEM,XRD and XPS.The results showed that the annealing of Ti_(3)C_(2)T_(x)at 200—300℃ leads to the formation of TiO_(2)nanoparticles on the surface and F content decrease while maintaining a good two-dimensional structure.However,at the temperature higher than 300℃,the composition of Ti_(3)C_(2)T_(x)decreases,and large agglomerates of TiO_(2)forms,destroying the two-dimensional structure of the material.Through the analysis of electrochemical performance,it was found that the specific capacitance of Ti_(3)C_(2)T_(x)after heat treatment at 250℃ reached 316 F·g^(-1)at the scanning speed of 100 mV·s^(-1),with a capacitance retention rate of 78% after 5000 cycles of charge-discharge test was at the current density of 10 A·g^(-1).It should be noted that the resistance Rs of Ti_(3)C_(2)T_(x)increased after heat treatment.
作者
杨贺川
王燕
蔡旺锋
张旭斌
李国兵
YANG Hechuan;WANG Yan;CAI Wangfeng;ZHANG Xubin;LI Guobing(School of Chemical Engineering and Technology,Tianjin University,Tianjin 300350,China)
出处
《化学工业与工程》
北大核心
2025年第4期1-8,共8页
Chemical Industry and Engineering
基金
国家自然科学基金资助项目(21978198)。
