FeO@C/MAX复合材料的制备及电化学动力学性能
Preparation and electrochemical kinetics properties of FeO@C/MAX composites
张鑫 1路馨语 1许蕊 1牛永安2
作者信息
- 1. 沈阳化工大学 化学工程学院,辽宁 沈阳 110142
- 2. 沈阳化工大学 材料科学与工程学院,辽宁 沈阳 110142
- 折叠
摘要
将α-Fe2O3@C与钛粉和铝粉一同进行高温煅烧,制备了FeO@C/MAX(FCM)复合材料.通过XRD、SEM、TEM表征了FCM复合材料在不同Ti/C与Al/C物质的量比下的结构、组成及形貌变化,采用电化学动力学分析方法定量计算了FCM复合材料的赝电容占比,推测可能的电荷储存机理.结果表明,随着Ti/C与Al/C物质的量比的增大,FCM复合材料中MAX相(Ti2AlC和Ti3AlC2)的含量随之变化,而α-Fe2O3转变为不稳定的FeO.当n(Ti)∶n(Al)∶n(C)=3∶1∶2时,制得的FCM-312样品在1 mV/s扫描速率下的比电容最大,为125.09 F/g,约为α-Fe2O3@C的 4.76 倍.FCM复合材料中部分MAX相在电化学过程中发生氧化还原反应,为离子间电子快速输运提供了条件,增加了FCM复合材料的赝电容占比.其中,FCM-312 样品在 10 mV/s扫描速率下的赝电容占比为22.12%.
Abstract
FeO@C/MAX(FCM)composites were prepared from calcination of α-Fe2O3@C with titanium powder and aluminum powder at high temperature.The structure,composition and morphology of FCM composites at different molar ratios of Ti/C and Al/C were characterized by XRD,SEM and TEM.Moreover,the pseudo-capacitance ratio of FCM composites was quantitatively calculated by electrochemical kinetics analysis with the possible charge storage mechanism deduced.The results showed that the content of MAX phase(Ti2AlC and Ti3AlC2)in the FCM composites was changed with the increment of Ti/C molar ratio as well as Al/C molar ratio,but α-Fe2O3 transformed into unstable FeO.According to data from electrochemical tests,the maximum specific capacitance of FCM-312 prepared with n(Ti)∶n(Al)∶n(C)=3∶1∶2 was 125.09 F/g at a sweep rate of 1 mV/s,approximately 4.76-fold higher than that of α-Fe2O3@C.Some MAX phases of FCM composites underwent redox reaction during the electrochemical process,which provided conditions for rapid electron transport between ions,and increased the pseudo-capacitance ratio of FCM composites.Among them,the pseudo-capacitance ratio of FCM-312 sample at 10 mV/s scanning rate reached 22.12%.
关键词
MAX/FeO/煅烧/动力学/电荷存储/功能材料Key words
MAX/FeO/calcination/dynamics/charge storage/functional materials引用本文复制引用
基金项目
辽宁省自然科学基金面上项目(2022-MS-312)
辽宁省教育厅项目(LQ2019009)
辽宁省教育厅项目(LJKZ0428)
出版年
2024
NETL
NSTL
维普
万方数据