Preparation of Ordered Fe3O4 Nanohoneycombs and Their Application in Capacitors

IF 1.8 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY ECS Journal of Solid State Science and Technology Pub Date : 2024-04-17 DOI:10.1149/2162-8777/ad3c24

Yuga Osada, Takashi Yanagishita

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Abstract

Fe substrates with a depression pattern were anodized to obtain Fe oxide films with a nanohoneycomb structure and orderly arranged cylindrical pores of uniform size. Crystalline Fe oxide films could be obtained by the heat treatment of amorphous samples obtained by the anodization of Fe substrates, but the atmosphere during heat treatment had a significant effect on the surface structure and crystallinity of the resulting samples. The heat treatment of the anodized samples in air produced a crystalline Fe oxide film consisting of Fe₂O₃ and Fe₃O₄, but the nanohoneycomb structure could not be maintained above 400 °C because the Fe substrate was oxidized during the heat treatment, and its surface structure changed significantly. On the other hand, the heat treatment of the anodized samples in N₂ atmosphere yielded Fe₃O₄ nanohoneycombs, which retained their regular honeycomb structure after heat treatment. The evaluation of the capacitor properties of the heat-treated samples showed that the properties differed markedly owing to the effects of the surface structure and crystallinity, with the sample heat-treated at 400 °C in N₂ atmosphere with the largest specific capacitance. The Fe₃O₄ nanohoneycombs obtained in this study are expected to be useful as electrodes for high-capacity capacitors.

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有序 Fe3O4 纳米蜂窝的制备及其在电容器中的应用

对具有凹陷图案的铁基底进行阳极氧化处理，可获得具有纳米蜂窝状结构和大小均匀、排列有序的圆柱形孔隙的氧化铁薄膜。通过对铁基底阳极氧化得到的无定形样品进行热处理，可以得到结晶氧化铁薄膜，但热处理时的气氛对所得样品的表面结构和结晶度有很大影响。在空气中对阳极氧化样品进行热处理会产生由 Fe2O3 和 Fe3O4 组成的结晶氧化铁膜，但由于铁基底在热处理过程中被氧化，其表面结构发生了显著变化，因此纳米蜂窝结构无法在 400 °C 以上的温度下保持。另一方面，在 N2 气氛中对阳极氧化样品进行热处理可得到 Fe3O4 纳米蜂窝，热处理后仍能保持其规则的蜂窝结构。对热处理过的样品的电容器性能进行的评估表明，由于表面结构和结晶度的影响，其性能存在明显差异，其中在氮气环境中 400 °C 热处理过的样品的比电容最大。本研究获得的 Fe3O4 纳米蜂窝有望用作大容量电容器的电极。

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来源期刊

ECS Journal of Solid State Science and Technology MATERIALS SCIENCE, MULTIDISCIPLINARY-PHYSICS, APPLIED

CiteScore

4.50

自引率

13.60%

发文量

455

期刊介绍： The ECS Journal of Solid State Science and Technology (JSS) was launched in 2012, and publishes outstanding research covering fundamental and applied areas of solid state science and technology, including experimental and theoretical aspects of the chemistry and physics of materials and devices. JSS has five topical interest areas: carbon nanostructures and devices dielectric science and materials electronic materials and processing electronic and photonic devices and systems luminescence and display materials, devices and processing.