Increased efforts have recently been devoted to developing high-energy-density flexible supercapacitors for their practical applications in portable and wearable electronics. Although high operating voltages have been achieved in fiber-shaped asymmetric supercapacitors (FASCs), low specific capacitance still restricts the further enhancement of their energy density. This article specifies a facile and cost-effective method to directly grow three-dimensionally well-aligned zinc–nickel-cobalt oxide (ZNCO)@Ni(OH)₂ nanowire arrays (NWAs) on a carbon nanotube fiber (CNTF) with an ultrahigh specific capacitance of 2847.5 F/cm³ (10.678 F/cm²) at a current density of 1 mA/cm², These levels are approximately five times higher than those of ZNCO NWAs/CNTF electrodes (2.10 F/cm²) and four times higher than Ni(OH)₂/CNTF electrodes (2.55 F/cm²). Benefiting from their unique features, we successfully fabricated a prototype coaxial FASC (CFASC) with a maximum operating voltage of 1.6 V, which was assembled by adopting ZNCO@Ni(OH)₂ NWAs/CNTF as the core electrode and a thin layer of carbon coated vanadium nitride (VN@C) NWAs on a carbon nanotube strip (CNTS) as the outer electrode with KOH poly(vinyl alcohol) (PVA) as the gel electrolyte. A high specific capacitance of 94.67 F/cm³ (573.75 mF/cm²) and an exceptional energy density of 33.66 mWh/cm³ (204.02 μWh/cm²) were achieved for our CFASC device, which represent the highest levels of fiber-shaped supercapacitors to date. More importantly, the fiber-shaped ZnO-based photodetector is powered by the integrated CFASC, and it demonstrates excellent sensitivity in detecting UV light. Thus, this work paves the way to the construction of ultrahigh-capacity electrode materials for next-generation wearable energy-storage devices.

中文翻译：

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构建用于高性能同轴光纤形状不对称超级电容器的超高容量锌镍镍钴氧化物@Ni（OH）₂核壳纳米线阵列。

近来，人们加大了对开发高能量密度柔性超级电容器的投入，以使其在便携式和可穿戴电子产品中得到实际应用。尽管在纤维状不对称超级电容器（FASC）中已经实现了高工作电压，但是低比电容仍然限制了其能量密度的进一步提高。本文介绍了一种简便且经济高效的方法，可在具有超高碳纳米管纤维（CNTF）上直接生长三维取向良好的三维锌-镍-钴氧化物（ZNCO）@Ni（OH）₂纳米线阵列（NWA）在1 mA / cm ²的电流密度下的比电容为2847.5 F / cm ³（10.678 F / cm ²）这些水平大约是ZNCO NWAs / CNTF电极（2.10 F / cm ²）的五倍，是Ni（OH）₂ / CNTF电极（2.55 F / cm ²）的四倍。得益于其独特的功能，我们成功制造了原型同轴FASC（CFASC），其最大工作电压为1.6 V，该组件通过采用ZNCO @ Ni（OH）₂ NWAs / CNTF作为芯电极和一层薄碳层组装而成以KOH聚乙烯醇（PVA）为凝胶电解质，在碳纳米管带（CNTS）上作为外电极涂覆氮化钒（VN @ C）NWA。94.67 F / cm ³（573.75 mF / cm ²）的高比电容和33.66 mWh / cm ³的出色能量密度我们的CFASC设备达到了（204.02μWh/ cm ²）的水平，代表了迄今为止纤维状超级电容器的最高水平。更重要的是，基于集成式CFASC的光纤状ZnO基光电探测器具有出色的检测紫外线灵敏度。因此，这项工作为构建下一代可穿戴式储能设备的超高容量电极材料铺平了道路。