One-dimensional (1D, wire- and fiber-shaped) supercapacitors have recently attracted interest due to their roll-up, micrometer-sized, and potential applications in portable or wearable electronics. Herein, a 1D wire-shaped electrode was developed based on Fe₃O₄ nanosheet arrays connected on the Fe wire, which was prepared via oxidation of Fe wire in 0.1 M KCl solution (pH=3) with O₂ rich environment under 70 °C. The obtained Fe₃O₄ nanosheet arrays displayed a high specific capacitance (20.8 mF cm^-1 at 10 mV s^-1) and long cycling lifespan (91.7% retention after 2500 cycles). The excellent performance may attribute to the connected nanosheet structure with abundant open spaces and the intimate contact between the Fe₃O₄ and iron substrate. In addition, a wire-shaped asymmetric supercapacitor was fabricated and had excellent capacitive properties with a high energy density (9 µWh cm^-2) at power density of 532.7 µW cm^-2 and remarkable long-term cycling performance (99% capacitance retention after 2000 cycles). Considering low cost and earth-abundant electrode material, as well as outstanding electrochemical properties, the assembled supercapacitor will possess enormous potential for practical applications in portable electronic device.

一维（一维，线形和纤维形）超级电容器由于其易卷起，微米级的尺寸以及在便携式或可穿戴电子设备中的潜在应用，最近引起了人们的关注。在此，基于连接在Fe线上的Fe ₃ O ₄纳米片阵列，开发了一维线状电极，该电极是通过将Fe线在富含O _2的0.1 M KCl溶液（pH = 3）中于70°C的条件下在70°C的条件下氧化而制得的C。将所得的Fe ₃ ö _4个纳米片阵列所显示的高的比电容（20.8 mF及其厘米^-1以10mV小号^-1）和长的循环寿命（2500次循环后保留力为91.7％）。优异的性能可以归因于具有足够的开放空间的连接的纳米片结构以及Fe ₃ O ₄与铁基体的紧密接触。另外，制造了一种线形非对称超级电容器，该电容器具有出色的电容特性，在532.7 µW cm ^-2的功率密度下具有高能量密度（9 µWh cm ^-2）和出色的长期循环性能（经过测试后电容保持率达99％） 2000个周期）。考虑到低成本和富含地球的电极材料以及出色的电化学性能，组装好的超级电容器在便携式电子设备中的实际应用将具有巨大的潜力。