Currently, one-dimensional nanostructured binary metal oxides attract a great attention in supercapacitors (SCs) application due to their rapid charge transportation. In this respect, different nanostructures of FeCo₂O₄ are designed by simply tuning the reaction temperature in hydrothermal synthesis. These nanostructures are directly grown on flexible stainless steel mesh and further applied as binder-free electrodes for SCs. The systematic study is carried out to confirm the relation between surface characteristics and electrochemical properties of FeCo₂O₄ thin film. Among different nanostructures, FeCo₂O₄ nanowire arrays exhibit hierarchical mesoporous structure and demonstrate good surface properties including high surface area and appropriate pore volume. As a consequence, relatively high specific capacitance of 1963 F g⁻¹ is obtained for the FeCo₂O₄ nanowire electrode. Further, asymmetric SC is fabricated using nanowired-FeCo₂O₄ and nanoparticulated-MnO₂ thin films as negative and positive electrodes with neutral Na₂SO₄ electrolyte. Impressively, the MnO₂//FeCo₂O₄ cell could be successfully cycled in a wide voltage window of 2.0 V, which can achieve a specific capacitance of 218 F g⁻¹ and energy density of 43 Wh kg⁻¹. In addition, the SCs exhibit improved capacitance with cycling, which is attributed to opening of micro-pores occurred by frequent ion transport.

当前，一维纳米结构的二元金属氧化物由于其快速的电荷传输而在超级电容器（SCs）的应用中引起了极大的关注。在这方面，通过简单地调节水热合成中的反应温度来设计FeCo ₂ O _4的不同纳米结构。这些纳米结构直接在柔性不锈钢网上生长，并进一步用作SC的无粘合剂电极。进行了系统的研究，以确认FeCo ₂ O ₄薄膜的表面特性与电化学性能之间的关系。在不同的纳米结构中，FeCo ₂ O ₄纳米线阵列表现出分层的中孔结构，并显示出良好的表面性能，包括高表面积和适当的孔体积。结果，对于FeCo ₂ O ₄纳米线电极获得了相对较高的1963 F g ^-1的比电容。此外，使用具有中性Na ₂ SO ₄电解质的纳米线-FeCo ₂ O ₄和纳米颗粒-MnO ₂薄膜作为负电极和正电极来制造不对称SC 。令人印象深刻的是MnO ₂ // FeCo ₂ O ₄电池可以在2.0 V的宽电压窗口内成功循环，这可以实现218 F g ^-1的比电容和43 Wh kg ^-1的能量密度。此外，SCs具有改善的循环电容，这归因于由于频繁的离子传输而导致的微孔的打开。