Electrospun α-Fe2O3 nanostructures for supercapacitor applications
Electrospun α-Fe2O3 nanostructures for supercapacitor applications
复制标题
DOI：
10.1039/c3ta12352a
复制
发表时间：
2013-01-01
影响因子：
11.9
通讯作者：
Sivakumar, N.
中科院分区：
文献类型：
--
作者：
Binitha, G.;Soumya, M. S.;Sivakumar, N.
在此，我们报道了通过静电纺丝技术，使用乙酰丙酮铁作为前体，聚乙酸乙烯酯和聚乙烯吡咯烷酮作为各自的聚合物，轻松合成了两种具有不同形貌的α-Fe2O3纳米结构。将电纺金属氧化物-聚合物复合纤维在 500 摄氏度下烧结以获得两种不同的纳米结构，在本手稿中表示为纳米颗粒和多孔纤维。使用粉末 X 射线衍射 (XRD)、拉曼光谱、扫描电子显微镜 (SEM)、能量色散 X 射线光谱 (EDAX) 和透射电子显微镜 (TEM) 对这些晶体纳米结构进行了表征。表征结果阐明了各自纳米结构中粒径为 21 和 53 nm 的赤铁矿 (α-Fe2O3) 的主导地位。进行电泳沉积以制造薄膜电极，然后对其进行电化学分析。电化学表征表明，两种制备的电极在1 M LiOH电解质中均表现出优异的性能，多孔纤维和纳米颗粒结构的比电容值分别为256和102 F g(-1)，在1 mV s(-1)的扫描速率下，即使在3000次循环后也具有优异的电容保持率，从而使其成为有前景的储能设备电极材料。
Herein, we report the facile synthesis of two alpha-Fe2O3 nanostructures with different morphologies via an electrospinning technique using ferric acetyl acetonate as a precursor and polyvinyl acetate and polyvinyl pyrrolidone as the respective polymers. The as-electrospun metal oxide-polymer composite fibers were sintered at 500 degrees C to obtain two distinct nanostructures, denoted as nanograins and porous fibers throughout this manuscript. These crystalline nanostructures were characterized using powder X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDAX) and transmission electron microscopy (TEM). The characterization results elucidated the predominance of hematite (alpha-Fe2O3) with particle sizes of 21 and 53 nm, for the respective nanostructures. Electrophoretic deposition was carried out in order to fabricate thin film electrodes, which were then subjected to electrochemical analysis. Electrochemical characterization revealed that both of the fabricated electrodes exhibited excellent performance in 1 M LiOH electrolyte with specific capacitance values of 256 and 102 F g(-1) for the porous fiber and nanograin structures, respectively, at a scan rate of 1 mV s(-1) and excellent capacitance retention, even after 3000 cycles, thus making them promising electrode materials for energy storage devices.