Abstract

In recent years electrochemical energy storage solutions such as supercapacitors have emerged as an attractive option. Supercapacitor electrode materials which are carbon-based composites with metal/metal oxide/metal hydroxide show enhanced energy density properties otherwise lacking in purely carbon-based systems. In this work, carbon nanospheres (CNSs) were synthesized using the hydrothermal method with an average diameter of 460 nm. Multiple samples were prepared of iron immobilization on the surface of CNSs by the ultra-sonication process using an organometallic complex, tris-(1,10-phenanthroline)-iron (II) sulfate (Fe-complex). The organo-metallic complex, as well as the synthesized CNS-Fe powders, were characterized using UV-Visible Spectroscopy, FTIR, SEM, and BET surface area analyzer as applicable. FTIR, UV-Visible and EDS results were used to delineate that the amount of Fe-complex immobilized on the CNSs is ranging from partial to complete coverage of the CNSs. The Fe-complex immobilized CNSs demonstrated good applicability for supercapacitor electrode applications. The electrochemical capacitance measurements with a three-electrode setup show that the pseudo capacitance value enhancement was best for CNS samples with a partial surface coverage of Fe-complex.

摘要

近年来，超级电容器等电化学储能解决方案已成为一种有吸引力的选择。作为具有金属/金属氧化物/金属氢氧化物的碳基复合材料的超级电容器电极材料显示出增强的能量密度特性，否则纯碳基系统缺乏这些特性。在这项工作中，使用水热法合成了平均直径为 460 nm 的碳纳米球 (CNS)。使用有机金属络合物三-(1,10-菲咯啉)-硫酸铁 (II) (Fe-络合物) 通过超声处理制备了多个样品在 CNS 表面上固定铁。使用紫外-可见光谱、FTIR、SEM 和 BET 表面积分析仪对有机金属络合物以及合成的 CNS-Fe 粉末进行表征。红外光谱, 紫外可见和 EDS 结果用于描述固定在 CNS 上的 Fe 配合物的量从部分到完全覆盖 CNS 不等。固定化铁络合物的 CNS 在超级电容器电极应用中表现出良好的适用性。使用三电极装置进行的电化学电容测量表明，对于部分表面覆盖有 Fe 复合物的 CNS 样品，伪电容值增强效果最好。