The development of sustainable options for energy storage in textiles is needed to power future wearable “Internet-of-Things” (IoT) electronics. This research explores the necessity of considering new and innovative alternatives that address the critical aspects of sustainability, reuse, repair, and second-life utilization in the development process.

Based on this perspective, we investigate the possibility to combine commercial carbon fibers yarns, as current collectors, with an in-situ regenerated cellulose-based hydrogel (RCIHs) as an electrolyte, to design 1D fiber-shaped capacitors (FSCs). Owing to its nature, the developed RCIHs are quite susceptible to the relative humidity (RH) variation, which in turn reflects in the device’s performance, in terms of areal-specific capacitance, specific energy, and power density. The areal specific capacitance reaches 433.02 μF·cm−2 at 5 μA·cm−2, while the specific energy density is 1.73 × 10−2 μWh·cm−2. The maximum achieved specific power density is 5.33 × 10−1 mW·cm−2 at 1 mA·cm−2.Moreover, the 1D FSCs display a long-life cycle, 92 % capacitance retention after 10000 consecutive CVs cycles.

In addition, an environmentally responsible approach can be implemented and the materials that integrate the FSCs can be recovered and reused again to fabricate new 1D FSCs without compromising the electrochemical performance, ensuring 92 % retention after 10000 consecutive CVs cycles.