Al3+ coagulated wet-spun graphene fibers show a large surface area and high electrical conductivity, resulting in large capacitance.

Flexible and pliable fiber electrodes with decent electrical conductivity and high capacitance density are crucial to fiber-shaped supercapacitors (FSCs) whose real-world applications include electronic textiles, miniaturized energy storage devices, and so on. Herein, we report a hybrid fiber structure made of reduced graphene oxide (rGO) and MXene, both of which are highly conductive two-dimensional (2D) materials, assembled into fibers via the scalable wet-spinning technique. By incorporation of 60 wt % MXene, the hybrid fibers can reach a balanced performance with conductivity up to 743.1 S cm −1 , meanwhile maintaining decent flexibility. To improve ion accessibility to inner pores within the fibers, nonvolatile electrolyte (H 2 SO 4 ) was preincorporated in between MXene and rGO layers. In addition, the size effect of MXene sheets on the overall performance of hybrid fibers was studied, favoring larger size of MXene in general. With these effective strategies, our optimal FSCs provide outstanding energy density (ca. 12 μWh cm −2 and 9.85 mWh cm −3 ) at a high power density (ca. 8.8 mW cm −2 and 7.1 W cm −3 ), showing great promise where high volumetric output is desired.

Graphene-based e-textiles have attracted great interest because of their promising applications in sensing, protection, and wearable electronics. Here, we report a scalable screen-printing process along with continuous pad-dry-cure treatment for the creation of durable graphene oxide (GO) patterns onto viscose nonwoven fabrics at controllable penetration depth. All the printed nonwovens show lower sheet resistances (1.2–6.8 kΩ/sq) at a comparable loading, as those reported in the literature, and good washfastness, which is attributed to the chemical cross-linking applied between reduced GO (rGO) flakes and viscose fibers. This is the first demonstration of tunable penetration depth of GO in textile matrices, wherein GO is also simultaneously converted to rGO and cross-linked with viscose fibers in our processes. We have further demonstrated the potential applications of these nonwoven fabrics as physical sensors for compression and bending.

In this study, we developed a new synthesis method for modifying activated carbon fibers (ACFs) by dopamine with oxidation-based self-polymerization (DA-ACFs).