摘要
将α-Fe_(2)O_(3)@C与钛粉和铝粉一同进行高温煅烧,制备了Fe O@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(Ti_(2)Al C和Ti_(3)Al C_(2))的含量随之变化,而α-Fe_(2)O_(3)转变为不稳定的Fe O。当n(Ti)∶n(Al)∶n(C)=3∶1∶2时,制得的FCM-312样品在1 m V/s扫描速率下的比电容最大,为125.09 F/g,约为α-Fe_(2)O_(3)@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 m V/s扫描速率下的赝电容占比为22.12%。
FeO@C/MAX(FCM)composites were prepared from calcination ofα-Fe_(2)O_(3)@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(Ti_(2)AlC and Ti_(3)AlC_(2))in the FCM composites was changed with the increment of Ti/C molar ratio as well as Al/C molar ratio,butα-Fe_(2)O_(3) 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 ofα-Fe_(2)O_(3)@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%.
作者
张鑫
路馨语
许蕊
牛永安
ZHANG Xin;LU Xinyu;XU Rui;NIU Yongan(School of Chemical Engineering,Shenyang University of Chemical Technology,Shenyang 110142,Liaoning,China;School of Materials Science and Engineering,Shenyang University of Chemical Technology,Shenyang 110142,Liaoning,China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2024年第2期373-380,共8页
Fine Chemicals
基金
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,LJKZ0428)。
