PSS Fibers Research Articles

High-performance thermoelectric PEDOT:PSS fiber bundles via rational ionic liquid treatment

Rapid growth of wearable technology generates increasing demand for lightweight and elastic energy harvesting systems. Among them, conducting polymer poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) shows great potential for lightweight and flexible thermoelectric generators. However, the practical applications of PEDOT:PSS have been restricted by the low Seebeck coefficient and power factor. Here, PEDOT:PSS/1,3-dimethylimidazolium dicyanamide (MMIM:DCA) fiber bundles with enhanced thermoelectric performance have been fabricated by optimizing the content of ionic liquids (ILs), and the duration of dual post-treatment with H2SO4 and NaBH4. The as-prepared fiber bundles exhibit a high power factor of 91.8 μW/m K−2 at 298 K. Detailed characterizations confirm that the phase separation and structural rearrangement of the polymer chains triggered by ILs ensure high charge carrier mobility, resulting in increased electrical conductivity. Meanwhile, the strong binding of DCA− to the PEDOT structure, combined with the hydrophilicity and potent reducing effect of MMIM+, synergistically alters the oxidation state of PEDOT, leading to an enhanced Seebeck coefficient. Moreover, the assembled flexible fiber bundle thermoelectric devices exhibit superior performance and usability, which show an output power density of 36.76 μW cm−2 with a temperature gradient of 25 K. This work offers valuable insights into the development of high-performance organic thermoelectric materials via the modulation of polymer chains.

Starfish-inspired ultrasensitive piezoresistive pressure sensor with an ultra-wide detection range for healthcare and intelligent production

Flexible pressure sensors have attracted significant attention due to their wide range of applications in various fields (e.g., robotis, healthcare, and human–machine interfaces). However, achieving both high sensitivity and a wide detection range remains a challenge. Here, we propose a novel starfish-inspired ultrasensitive piezoresistive pressure sensor capable of detecting an extensive range of pressures. The sensor’s design incorporates high and low spine structures inspired by the surface of a starfish, efficiently preventing rapid saturation of detection range and expanding the response range. Unlike single-material nanofiber structures, the ultrathin and ultrasensitive layer, fabricated using PEDOT: PSS/TPU nanofibers, possesses a large surface area ratio and numerous contact points. This allows for a quick increase in conductive channels when pressure is applied. The intertwining of PEDOT: PSS fibers with TPU fibers enhances both the mechanical strength of the fiber membrane and the initial resistance of the sensor, thereby increasing its sensitivity. Additionally, PVA fibers are fabricated over the interdigital electrode to serve as insulation layer for controlling resistance change between the sensitive layer and the electrode. Importantly, the interaction between the PVA fibers and the PEDOT: PSS/TPU fibers alters the deformation behavior of the sensitive layer fibers, further enhancing the performance of the sensor. The fabricated sensor demonstrates exceptional sensitivity (302.9 kPa−1), an extensive detection range of 0–426.7 kPa, and remarkable endurance of over 7,000 cycles at 110 kPa, rendering it a device with great potential for precise pressure sensing applications in health monitoring and intelligent production.

Continuous fabrication of flexible, high-performance PEDOT: PSS thermoelectric fiber without post-processing

Organic thermoelectric fibers (OTEFs) are popular in wearable self-powered technology due to easy weaving and power generation. However, limitations include poor spinning capability, weak mechanical strength, low output power, and dangerous post-treatment. Here, we report the rapid preparation of flexible, high-performance OTEFs without post-treatment through introducing ionic liquid (IL) of 1-ethyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide (EMIM: TFSI) into the Poly (3,4-ethylene dioxythiophene): Poly (styrene sulfonate) (PEDOT: PSS) to enhance thermoelectric properties, and mechanical strength, with just 1 wt% of IL enabling continuous fabrication of the PEDOT: PSS fiber. The resulting fiber exhibits remarkable electrical, and thermoelectric performance of ∼2267.7 S cm−1, and ∼85 μW m−1 K−2, respectively. It also demonstrates excellent strength (∼289.72 MPa), with a resistance change of less than 8 % after 10,000 bending cycles. The fabricated five-legs devices achieve an impressive output power and output power density of ∼7.84 nW and ∼4.32 μW cm−2 at 49 K, and the fabric textile generates a significant voltage of ∼47.8 mV using human body heat. This work proposes a new design strategy for high-performance organic thermoelectric fibers without additional post-processing, and the ultra-high output power and flexibility exhibit excellent combined application potential in both organic and inorganic TE fields.

Optimization of Wet-Spun PEDOT:PSS Fibers for Thermoelectric Applications Through Innovative Triple Post-treatments

Owing to the high flexibility, low thermal conductivity, and tunable electrical transport property, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) exhibits promising potential for designing flexible thermoelectric devices in the form of films or fibers. However, the low Seebeck coefficient and power factor of PEDOT:PSS have restricted its practical applications. Here, we sequentially employ triple post-treatments with concentrated sulfuric acid (H2SO4), sodium borohydride (NaBH4), and 1-ethyl-3-methylimidazolium dichloroacetate (EMIM:DCA) to enhance the thermoelectric performance of flexible PEDOT:PSS fibers with a high power factor of (55.4 ± 1.8) μW m−1 K−2 at 25 °C. Comprehensive characterizations confirm that excess insulating PSS can be selectively removed after H2SO4 and EMIM:DCA treatments, which induces conformational changes to increase charge carrier mobility, leading to enhanced electrical conductivity. Simultaneously, NaBH4 treatment is employed to adjust the oxidation level, further optimizing the Seebeck coefficient. Additionally, the assembled flexible fiber thermoelectric devices show an output power density of (60.18 ± 2.79) nW cm−2 at a temperature difference of 10 K, proving the superior performance and usability of the optimized fibers. This work provides insights into developing high-performance organic thermoelectric materials by modulating polymer chains.Graphical

All-Polymeric stretchable conductive fiber with versatile intelligent wearable applications via microfluidic spinning technology

It remains a great challenge to fabricate all-polymer stretchable conductive fibers simultaneously presenting high mechanical robustness, high stretchability, and high conductivity through convenient and fast process, even though they exhibit great application potential in the intelligent wearable fields in replacement of the traditional metal wires or the liquid metal-based conductive fibers. In this paper, an all-polymeric fiber with core–shell structure is continuously produced through co-axial microfluidic spinning strategy. The composition of the fluids and the processing parameters of MST are regulated to adjust the size of the obtained PU@PEDOT:PSS fiber, and then optimizing its electric properties and the mechanical performances. The polyurethane (PU) elastic shell layer and the H2SO4-doped PEDOT:PSS conductive core provide the obtained composite fiber with a high conductivity exceeding 220 S m−1, as well as an impressive stretchability up to above 400 % strain, thus endowing it with versatile intelligent wearable applications, including the super-sensitive strain sensor for human motions monitoring, textile-based triboelectric nanogenerator for self-powered impact sensing, and the electro-thermal conversion fabric for keep warming.

High Thermoelectric Performance and Flexibility in Rationally Treated PEDOT:PSS Fiber Bundles

Organic thermoelectric fibers have great potential as wearable thermoelectric textiles because of their one-dimensional structure and high flexibility. However, the insufficient thermoelectric performance, high fabrication cost, and mechanical fragility of most organic thermoelectric fibers significantly limit their practical applications. Here, we employ a rapid and cost-effective wet-spinning method to prepare dimethyl sulfoxide-doped poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) fiber bundles, followed by rational post-treatment with concentrated sulfuric acid (98% H2SO4) to enhance their thermoelectric performance. The wearable fiber bundles composed of multiple individual PEDOT:PSS fibers have effectively reduced resistance and overall high tensile strength and stability. Rational treatment with H2SO4 partially removes excessive PSS, thereby increasing the electrical conductivity to 4464 S cm‒1, while the parallel bundle is also a major factor in improving the power factor of up to 80.8 μW m‒1 K‒2, which is super-competitive compared with those of currently published studies. Besides, the thermoelectric device based on these fiber bundles exhibits high flexibility and promising output power of 2.25 nW at a temperature difference of 25 K. Our work provides insights into the fabrication of all-organic flexible high-conductivity textiles with high thermoelectric properties.Graphical

High-Hole-Mobility Fiber Organic Electrochemical Transistors for Next-Generation Adaptive Neuromorphic Bio-Hybrid Technologies.

The latest developments in fiber design and materials science are paving the way for fibers to evolve from parts in passive components to functional parts in active fabrics. Designing conformable, organic electrochemical transistor (OECT) structures using poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) fibers has excellent potential for low-cost wearable bioelectronics, bio-hybrid devices, and adaptive neuromorphic technologies. However, to achieve high-performance, stable devices from PEDOT:PSS fibers, approaches are required to form electrodes on fibers with small diameters and poor wettability, that leads to irregular coatings. Additionally, PEDOT:PSS-fiber fabrication needs to move away from small batch processing to roll-to-roll or continuous processing. Here, it is shown that synergistic effects from a superior electrode/organic interface, and exceptional fiber alignment from continuous processing, enable PEDOT:PSS fiber-OECTs with stable contacts, high µC* product (1570.5 F cm-1 V-1 s-1 ), and high hole mobility over 45 cm2 V-1 s-1 . Fiber-electrochemical neuromorphic organic devices (fiber-ENODes) are developed to demonstrate that the high mobility fibers are promising building blocks for future bio-hybrid technologies. The fiber-ENODes demonstrate synaptic weight update in response to dopamine, as well as a form factor closely matching the neuronal axon terminal.

Highly Conductive n‐Type Polymer Fibers from the Wet‐Spinning of n‐Doped PBDF and Their Application in Thermoelectric Textiles

AbstractThe field of electronic textiles currently lacks n‐type polymer fibers that can complement the more established p‐type polymer fibers. Here, a highly conductive n‐type polymer fiber is obtained via wet‐spinning of n‐doped poly(3,7‐dihydrobenzo[1,2‐b:4,5‐b’]difuran‐2,6‐dione) (n‐PBDF). The electrical conductivity of the fibers increases from 1000 to 1600 S cm−1 with increased draw during processing and correlates well with Young's modulus. Wide‐angle X‐ray scattering reveals the existence of a bimodal orientation of the polymer chains, favoring parallel alignment to the fiber axis with increased draw. After 14 d in 80% humid air, fiber conductivity stabilizes maintaining 81% of the initial conductivity. Although the electrical conductivity drops slightly over time, the Seebeck coefficient increases, resulting in the highest thermoelectric power factor being measured at 91 µW m−1 K−2 for the most drawn fiber 14 d after its fabrication. A proof‐of‐concept two‐couple thermoelectric textile is crafted by embroidering bundles of n‐type PBDF fibers and p‐type PEDOT:PSS fibers. The device generates 2.40 nW at a 22 °C temperature gradient. This work represents the initial steps and a crucial advancement toward fabricating high‐performance n‐type polymer fibers that can complement their p‐type counterparts to close the existing performance gap.

Processability of Thermoelectric Ultrafine Fibers via Electrospinning for Wearable Electronics.

Polymer-based thermoelectric generators hold great appeal in the realm of wearable electronics as they enable the utilization of body heat for power generation. Fibers produced from conducting polymers for use in thermoelectric generators have high porosity and good flexibility, providing comfort-based performance advantages over thin films for wearable electronics. Some fiber processing techniques have been explored to produce textile-based thermoelectric generators; however, they fail to approach the conductivities of polymeric thin films. Ultrafine fibers solution processed through electrospinning yield fiber diameters on the nanoscale, allowing for high surface area to volume ratios and thus low thermal conductivity; however, a number of processing challenges in electrospinning conducting polymers limit the success of preparing high performing thermoelectric textiles. In this work, the specific processing challenges inherent to electrospinning conducting polymers are addressed for both n- and p-type materials. For the p-type polymer, 63 wt % PEDOT:PSS fibers are fabricated through solution formulation improvements yielding a conductivity of 3 S/cm and a power factor of 0.1 μW/mK2. The first of their kind n-type poly(NiETT)/PVA electrospun fibers were created yielding a conductivity of 0.11 S/cm and a power factor of 0.0036 μW/mK2. These nonwoven ultrafine fiber mats show progress toward achieving textile-based thermoelectric materials with equivalent performance of comparable polymeric thin films. This work shows the feasibility of creating ultrafine fibers for use in thermoelectric generators through electrospinning including the first demonstration of poly(NiETT)/PVA fibers.

Production of Blended Poly(acrylonitrile): Poly(ethylenedioxythiophene):Poly(styrene sulfonate) Electrospun Fibers for Neural Applications.

This study describes, for the first time, the successful incorporation of poly(ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) in Poly(acrylonitrile) (PAN) fibers. While electroconductive PEDOT:PSS is extremely challenging to electrospun into fibers. Therefore, PAN, a polymer easy to electrospun, was chosen as a carrier due to its biocompatibility and tunable chemical stability when cross-linked, particularly using strong acids. PAN:PEDOT:PSS blends, prepared from PEDOT:PSS Clevios PH1000, were electrospun into fibers (PH1000) with a diameter of 515 ± 120 nm, which after being thermally annealed (PH1000 24H) and treated with heated sulfuric acid (PH1000 H2SO4), resulted in fibers with diameters of 437 ± 109 and 940 ± 210 nm, respectively. The fibers obtained over the stepwise process were characterized through infra-red/Raman spectroscopy and cyclic voltammetry. The final fiber meshes showed enhanced electroconductivity (3.2 × 10-3 S cm-1, four-points-assay). Fiber meshes biocompatibility was evaluated using fibroblasts and neural stem cells (NSCs) following, respectively, the ISO10993 guidelines and standard adhesion/proliferation assay. NSCs cultured on PH1000 H2SO4 fibers presented normal morphology and high proliferation rates (0.37 day-1 vs. 0.16 day-1 for culture plate), indicating high biocompatibility for NSCs. Still, the low initial NSC adhesion of 7% calls for improving seeding methodologies. PAN:PEDOT:PSS fibers, here successful produced for the first time, have potential applications in neural tissue engineering and soft electronics.

Influence of relative humidity on the structure, swelling and electrical conductivity of PEDOT:PSS fibers

PEDOT:PSS is a conducting polymer with a wide variety of applications in the field of organic electronics. Over the past few years our group has developed PEDOT:PSS fibers with high electrical conductivity and robust mechanical properties, and we have observed changes in their properties that seemed to stem from seasonal changes in atmospheric relative humidity. In this work, we report the influence of relative humidity on the swelling, electrical conductivity and structure of wet-spun PEDOT:PSS fibers. The diameter of the fibers linearly increased with relative humidity up to the 70–80% range where the increase became exponential. The electrical conductivity reversibly decreased with increasing relative humidity with a similar linear and then exponential behavior. Additionally, an irreversible decrease (aging) in electrical conductivity was also observed. To gain more insight into the structural origin of these changes, wide angle x-ray scattering of the PEDOT:PSS fibers were gathered at different relative humidities in the 10–90% range so that the changes in structure could be observed in situ. On one hand, the lamella stacking distance of PEDOT and PSS chains increased linearly up to the 70–80% relative humidity range where the increase became exponential. On the other hand, the π-π stacking distance between PEDOT chains remained unaltered. We found that the changes in the lamella stacking distance were closely correlated to the changes observed for the diameter and electrical conductivity.

Robust and knittable wet-spun PEDOT: PSS fibers via water

Since achieving green and sustainable development has become a global goal, a unique coagulation bath system without organic solvents has been developed for wet-spinning poly(3,4-ethylenedioxythiophene): poly (styrene sulfonate) (PEDOT: PSS) conductive fibers. A small amount of metal ions was added to water to promote fiber solidification. Especially, with Fe3+ and thermal drawing aid, the resultant fiber reveals a maximum tensile breaking strength of 1263.1 ± 58.3 MPa, the highest reported value for pure PEDOT: PSS fibers to the best of our knowledge. The knitted fabrics woven from robust PEDOT: PSS fibers show superior flexibility and thermal insulation, demonstrating their excellent application potential in flexible electronic fabrics.

Understanding the evolution of mechanical and electrical properties of wet-spun PEDOT:PSS fibers with increasing carbon nanotube loading

Unprecedented demands for advanced fiber materials have been raised by the quick development of wearable intelligent devices. It is still a significant problem to increase the mechanical qualities of fibers without compromising their chemical properties. The impact of different carbon nanotube (CNT) loading on the physical properties of wet-spun poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) fibers are explored in depth along with a wet spinning process for the continuous fabrication of PEDOT:PSS/CNT hybrid fibers. We discovered that the main challenge in a mechanically reinforced system of PEDOT:PSS fibers is to prevent the binding and aggregation of CNT within the fibres; enhancement is typically accomplished at 5 wt% CNT loadings. On the other hand, the conductivity of PEDOT:PSS fibers rises as CNT content increases. By applying the new understanding, the highly conductive PEDOT:PSS/CNT hybrid fiber exhibits greater rate performance and cycle stability in the electrochemical test is obtained. The PEDOT:PSS/CNT hybrid fiber-based fiber-shaped supercapacitors (FSC) have been assembled and they show good long-term cycle stability. Meanwhile, energy and power densities reach ∼16.05 mW h cm−3 and ∼13292 mW cm−3, respectively. This work provides a favorable reference for the mass production of fiber electrodes with high mechanical properties for energy storage.

Highly Conductive, Ultrastrong, and Flexible Wet-Spun PEDOT:PSS/Ionic Liquid Fibers for Wearable Electronics

Conductive poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) fibers with high electrical conductivity, flexibility, and robustness are urgently needed for constructing wearable fiber-based electronics. In this study, the highly conductive (4288 S/cm), ultrastrong (a high tensile strength of 956 MPa), and flexible (a low Young's modulus of 3.8 GPa) PEDOT:PSS/1-ethyl-3-methylimidazolium dicyanamide (EMIM:DCA) (P/ED) fiber was prepared by wet-spinning and a subsequent H2SO4-immersion-drawing process. As far as we know, this is the best performance of the PEDOT:PSS fiber reported so far. The structure and conformation of the P/ED fiber were characterized by FESEM, XPS, Raman spectroscopy, UV-vis-NIR spectroscopy, and WAXS. The results show that the high performances of the P/ED fiber are mainly attributed to the massive removal of PSS and high degree of crystallinity (87.9%) and orientation (0.71) of PEDOT caused by the synergistic effect of the ionic liquid, concentrated sulfuric acid, and high stretching. Besides, the P/ED fiber shows a small bending radius of 0.1 mm, and the conductivity of the P/ED fiber is nearly unchanged after 1000 repeated cycles of bending and humidity changes within 50-90%. Based on this, various P/ED fiber-based devices including the circuit connection wire, thermoelectric power generator, and temperature sensor were constructed, demonstrating its wide applications for constructing flexible and wearable electronics.

Wet-spun PEDOT: PSS/ionic liquid composite fibers for wearable e-textiles

Wet-spinning technology plays an essential role in the development of wearable electronics. Poly(3,4-ethylene dioxythiophene): poly(styrene sulfonate) (PEDOT: PSS) fibers have been widely investigated in this field due to their advantages of being environment-friendly and low-cost. They are mainly wet-spun from a coagulation bath containing ethanol and water with additional metal salts. However, the conductivity of PEDOT: PSS fibers spun by this method is low. Here, we propose a novel coagulation bath made of ionic liquid (IL), ethanol, and water, and the resultant PEDOT: PSS fibers could achieve a conductivity of 118.3 S·cm−1. Furthermore, the fiber-shaped supercapacitor prepared by such PEDOT: PSS/IL fibers reveals an optimal capacitance retention rate of 97 % even after 10,000 cycles, and the capacitance loss of the supercapacitor is only 7 % at −20 ℃. The sensor derived from the PEDOT: PSS/IL fibers has superb sensing capability, indicating their promising applications for wearable electronics.

Highly stretchable and elastic PEDOT:PSS helix fibers enabled wearable sensors

A self-helical PEDOT:PSS fiber with a high breaking tensile elongation (950%), superior electrical conductivity (650 S cm−1), and remarkable elasticity (400%) was successfully prepared and reveals promising application in wearable electronics.

Synergistic Charge Percolation in Conducting Polymers Enables High‐Performance In Vivo Sensing of Neurochemical and Neuroelectrical Signals

Challenges remain in establishing a universal method to precisely tune electrochemical properties of conducting polymers for multifunctional neurosensing with high selectivity and sensitivity. Here, we demonstrate a facile and general approach to achieving synergistic charge percolation in conducting polymers (i.e., poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate), PEDOT:PSS) by incorporating conductive catalysts (i.e., carbon nanotubes, CNTs) and post-processing. The approach shows synergistic effects: (i) CNTs and post-processing together promote PEDOT ordered interconnection for highly efficient charge percolation that accelerates electrochemical kinetics; (ii) CNTs catalyze the electrooxidation of vitamin C for selective electrochemical sensing; (iii) CNTs enhance the charge storage/injection capacity of PEDOT:PSS. The prepared CNT-PEDOT:PSS fiber mechanically matches with neural tissues and is proved to be a biocompatible versatile microsensor capable of high-performance neurosensing in vivo.

Synergistic Charge Percolation in Conducting Polymers Enables High‐Performance In Vivo Sensing of Neurochemical and Neuroelectrical Signals

AbstractChallenges remain in establishing a universal method to precisely tune electrochemical properties of conducting polymers for multifunctional neurosensing with high selectivity and sensitivity. Here, we demonstrate a facile and general approach to achieving synergistic charge percolation in conducting polymers (i.e., poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate), PEDOT:PSS) by incorporating conductive catalysts (i.e., carbon nanotubes, CNTs) and post‐processing. The approach shows synergistic effects: (i) CNTs and post‐processing together promote PEDOT ordered interconnection for highly efficient charge percolation that accelerates electrochemical kinetics; (ii) CNTs catalyze the electrooxidation of vitamin C for selective electrochemical sensing; (iii) CNTs enhance the charge storage/injection capacity of PEDOT:PSS. The prepared CNT‐PEDOT:PSS fiber mechanically matches with neural tissues and is proved to be a biocompatible versatile microsensor capable of high‐performance neurosensing in vivo.

A PEDOT:PSS thermoelectric fiber generator

Organic thermoelectric (TE) fibers, that combine the impressive structural features and high heat-to-electricity conversion capability, have made great achievements in recent years, while convenient and efficient preparation of flexible polymer fibers remains a great challenge. Herein, flexible poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) fibers are efficiently produced through a convenient freeze-thaw (FT) induced gelation and subsequent high speed wet-spinning process. The spinnability and TE properties of the resultant PEDOT:PSS spinning dopes are obviously improved by regulating the FT cycles, the extrusion velocity, the length/diameter ratio of the needle, as well as the type of coagulation bath. Accordingly, the optimized PEDOT:PSS fiber obtained at a pretty high extrusion speed (150 mm min−1 or 1037 mL h−1) exhibits a considerably high electrical conductivity of 1013 ± 32 S cm−1, which outperforms most wet-spinning PEDOT:PSS fibers reported so far, and also displays excellent mechanically-stable TE properties upon large mechanical bending or twisting deformation. Based on the PEDOT:PSS fibers, a simple and flexible TE generator is further assembled, which can generate stable output performance by harvesting human body heat or low temperature of ice cube, indicating its good adaptability to various scenarios. This work provides a novel, convenient, and effective approach to develop the PEDOT:PSS fibers and versatile fiber-based TE devices.

Construction of hierarchical polypyrrole coated copper-catecholate grown on poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) fibers for high-performance supercapacitors

Fiber-shaped supercapacitors (FSCs) are considered as the optimal candidate for wearable energy devices, due to their high safety, excellent electrochemical stability, workability and body adaptability. However, the specific capacitances of today’s FSCs such as carbon nanotube fibers and graphene fibers, are still not high enough for practical applications due to the limitation of their energy storage mode. So, we design a ternary composite fiber-shaped electrode: First, a kind of metal organic framework (MOF), copper-catecholate (Cu-CAT) nanorods, are in-situ grown on a wet-spun poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) fiber at the ambient temperature. Second, polypyrrole (PPy) is electrodeposited on the surface of the Cu-CAT/PEDOT:PSS fiber to obtain PPy@Cu-CAT@PEDOT:PSS fiber (PPy@Cu-CAT@PF). The growing Cu-CAT with high porosity anchored on the fiber surface provides electrochemical activate sites and the encapsulation of PPy effectively provides a continuous charge transfer path and improve its cycling stability. Notably, the PPy@Cu-CAT@PF electrode exhibits a satisfactory areal capacitance of 669.93 mF cm−2 at 2 mA cm−2, which remains 61.66% even at a high current density of 20 mA cm−2. Furthermore, the assembled symmetric FSC displays excellent electrochemical properties and outstanding mechanical flexibility, demonstrating its feasibility as a wearable supercapacitor.