One simple and environmental friendly synthesis strategy for preparing low-cost magnetic Fe3C@C materials has been facilely developed using a modified sol-gel approach,wherein natural magnetite acted as the iron sourc...One simple and environmental friendly synthesis strategy for preparing low-cost magnetic Fe3C@C materials has been facilely developed using a modified sol-gel approach,wherein natural magnetite acted as the iron source.A chelating polycarboxylic acid such as citric acid(CA)was employed as the carbon source,and it dissolved Fe very effectively,Fe3O4 and natural magnetite to composite an iron-citrate complex with the assistance of ammonium hydroxide.The core-shell structure of the as-prepared nanocomposites was formed directly by high-temperature pyrolysis.The Fe3C@C materials exhibited superparamagnetic properties(38.09 emu/mg),suggesting potential applications in biomedicine,environment,absorption,catalysis,etc.展开更多
采用水热法成功地合成了前驱体,并在氮气条件下煅烧得到氮掺杂的碳化铁/碳立方体。通过XRD、BET、 SEM、TEM对目标产物进行了表征,研究了氮掺杂的碳化铁/碳立方体的微观结构、表面形貌。氮掺杂的碳化铁/碳立方体作为锂离子负极材料的电...采用水热法成功地合成了前驱体,并在氮气条件下煅烧得到氮掺杂的碳化铁/碳立方体。通过XRD、BET、 SEM、TEM对目标产物进行了表征,研究了氮掺杂的碳化铁/碳立方体的微观结构、表面形貌。氮掺杂的碳化铁/碳立方体作为锂离子负极材料的电化学测试表明,在200 m A/g的电流密度下首次可逆容量达到889 m A·h/g,循环200次后,容量保持率为88.1%。同时,电流密度从0.1 A/g增加到5 A/g,容量具有一定的衰减,但恢复到0.1 A/g时,容量几乎维持到原来的水平,表明其具有良好的倍率性能。所以,制备的氮掺杂的碳化铁/碳多孔立方体具有较高的比容量、良好的循环性能和广泛的应用前景。展开更多
基金supported by the National Natural Science Foundation of China(No.51876046 and No.51711540032)。
文摘One simple and environmental friendly synthesis strategy for preparing low-cost magnetic Fe3C@C materials has been facilely developed using a modified sol-gel approach,wherein natural magnetite acted as the iron source.A chelating polycarboxylic acid such as citric acid(CA)was employed as the carbon source,and it dissolved Fe very effectively,Fe3O4 and natural magnetite to composite an iron-citrate complex with the assistance of ammonium hydroxide.The core-shell structure of the as-prepared nanocomposites was formed directly by high-temperature pyrolysis.The Fe3C@C materials exhibited superparamagnetic properties(38.09 emu/mg),suggesting potential applications in biomedicine,environment,absorption,catalysis,etc.
文摘采用水热法成功地合成了前驱体,并在氮气条件下煅烧得到氮掺杂的碳化铁/碳立方体。通过XRD、BET、 SEM、TEM对目标产物进行了表征,研究了氮掺杂的碳化铁/碳立方体的微观结构、表面形貌。氮掺杂的碳化铁/碳立方体作为锂离子负极材料的电化学测试表明,在200 m A/g的电流密度下首次可逆容量达到889 m A·h/g,循环200次后,容量保持率为88.1%。同时,电流密度从0.1 A/g增加到5 A/g,容量具有一定的衰减,但恢复到0.1 A/g时,容量几乎维持到原来的水平,表明其具有良好的倍率性能。所以,制备的氮掺杂的碳化铁/碳多孔立方体具有较高的比容量、良好的循环性能和广泛的应用前景。
