Integrated Sustainable Wind Power Harvesting and Ultrahigh Energy Density Wire‐Shaped Supercapacitors Based on Vertically Oriented Nanosheet‐Array‐Coated Carbon Fibers

Wind power harvesting in conjunction with supercapacitors (SCs) has attracted considerable attention. Nevertheless, the bottleneck in this field is how to develop SCs with low electrical resistance and high energy density. Herein, an ingenious strategy to integrate wind power harvesting and asymmetric wire‐shaped SCs (WSSCs) has been put forward for the first time. Remarkably, the asymmetric WSSCs are realized by using vertical FeOOH and CoNi₂S₄ nanosheet‐array‐coated flexible carbon fibers as negative and positive yarn electrodes, in which a vertically oriented and cross‐linked porous network, formed by electroactive nanosheet arrays, facilitates ionic diffusion and charge transport. Benefiting from an intriguing configuration, these asymmetric WSSCs, with superior flexibility and weavability, act as efficient energy storage devices, which exhibit low resistance, high volumetric energy density (3.2 mWh cm^‐3), and strong durability (91.2% after 20 000 cycles). As a result, two serial WSSCs with a high voltage of 3 V can be effectively recharged, by harvesting a sustainable wind source, and repeatedly supplying power to the lamp without decline of electrochemical performance. Therefore, this work throws light on a new avenue for the development of sustainable energy harvesting and wearable energy storage.