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energy density, impressive flexibility and excellent waterproof ability (fully immersed and charged/discharged under the water more than 33hrs for 3000 cycles with the capacity retention of approximately 80%). Combined with first principle theory calculation, the reversible electrochemical mechanisms of the FARZBs with one-step redox processes of Co 3 O 4 /CoOOH without obvious zinc dendrite deposits and structural change of Co 3 O 4 nanowires have been confirmed by cyclic voltammetry, in-situ X-ray diffraction, in-situ Raman and scanning/transmission electron microscopy. These results demonstrate that the FARZBs are promising power sources for emerging wearable electronics.

+ These authors contributed equally to this work. Abstract Recently, fiber-shaped yarn supercapacitors (YSCs) have attracted extensively attention due to their merits of small volume, high flexibility and potential to be woven in the textiles for future wearable electronics. PEDOT: PSS possesses properties of high-redox capacitance, high conductivity and high intrinsic flexibility, so PEDOT: PSS yarn electrodes are quite promising in the field of YSCs. However, to the best of our knowledge, twisted yarns based on wetspun PEDOT: PSS fibers for fiber-shaped YSCs have not been reported. Herein, we develop a new coagulation bath with CaCl 2 in aqueous solution for preparing meter-long PEDOT: PSS fibers. The PEDOT: PSS fibers with good mechanical properties can be easily woven, sewed, knotted and braided as the YSCs electrode. The PEDOT: PSS fiber-based YSCs show a high areal capacitance of 119 mF cm -2 and areal energy density of 4.13 µWh cm -2 .

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