Compactness and versatility of fiber‐based micro‐supercapacitors (FMSCs) make them promising for emerging wearable electronic devices as energy storage solutions. But, increasing the energy storage capacity of microscale fiber electrodes, while retaining their high power density, remains a significant challenge. Here, this issue is addressed by incorporating ultrahigh mass loading of ruthenium oxide (RuO₂) nanoparticles (up to 42.5 wt%) uniformly on nanocarbon‐based microfibers composed largely of holey reduced graphene oxide (HrGO) with a lower amount of single‐walled carbon nanotubes as nanospacers. This facile approach involes (1) space‐confined hydrothermal assembly of highly porous but 3D interconnected carbon structure, (2) impregnating wet carbon structures with aqueous Ru³⁺ ions, and (3) anchoring RuO₂ nanoparticles on HrGO surfaces. Solid‐state FMSCs assembled using those fibers demonstrate a specific volumetric capacitance of 199 F cm⁻³ at 2 mV s⁻¹. Fabricated FMSCs also deliver an ultrahigh energy density of 27.3 mWh cm⁻³, the highest among those reported for FMSCs to date. Furthermore, integrating 20 pieces of FMSCs with two commercial flexible solar cells as a self‐powering energy system, a light‐emitting diode panel can be lit up stably. The current work highlights the excellent potential of nano‐RuO₂‐decorated HrGO composite fibers for constructing micro‐supercapacitors with high energy density for wearable electronic devices.

中文翻译：

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纳米RuO2装饰的多孔石墨烯复合纤维，用于超高能量密度的微型超级电容器

基于光纤的微型超级电容器（FMSC）的紧凑性和多功能性使它们有望成为新兴的可穿戴电子设备的储能解决方案。但是，在保持其高功率密度的同时，增加微型纤维电极的能量存储能力仍然是一项重大挑战。在此，此问题通过将超高质量负载的氧化钌（RuO ₂）纳米颗粒（最高42.5 wt％）均匀地结合在纳米碳基微纤维上而得以解决，该纳米纤维主要由带孔的氧化石墨烯（HrGO）组成，单壁层的数量较少碳纳米管作为纳米间隔物。这种简便的方法涉及（1）高度多孔但3D互连的碳结构的空间约束水热组装，（2）用Ru ³⁺水溶液浸渍湿碳结构离子，以及（3）将RuO ₂纳米颗粒锚固在HrGO表面上。使用这些纤维组装的固态FMSC在2 mV s ^-1下显示出199 F cm ^-3的比容。预制FMSC还提供27.3 mWh cm ^-3的超高能量密度，是迄今为止报道的FMSC最高的能量密度。此外，将20个FMSC与两个商业柔性太阳能电池集成在一起作为自供电能源系统，可以稳定地点亮发光二极管面板。当前的工作凸显了纳米RuO ₂装饰的HrGO复合纤维在构建可穿戴电子设备中具有高能量密度的微型超级电容器方面的巨大潜力。