A hollow graphene/conducting polymer composite fiber is created with high mechanical and electronic properties and used to fabricate novel fiber-shaped supercapacitors that display high energy densities and long life stability. The fiber supercapacitors can be woven into flexible powering textiles that are particularly promising for portable and wearable electronic devices.

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MXenes with good conductivity and hydrophilicity are a new family of potential electrocatalysts (e.g., for hydrogen evolution). However, pristine MXenes usually show unsatisfactory catalytic activity compared with traditional platinum group metal electrocatalysts. We introduce both phosphorus and oxygen into Mo 2 CT x MXenes through a simple phosphorization course. The phosphorized Mo 2 CT x MXenes exhibit significantly improved electrocatalytic performance toward hydrogen evolution reaction compared with pristine Mo 2 CT x MXenes, with a dramatic decrease in overpotential (more than 100 mV at 10 mA cm −2 ). Theoretical computation suggests that P and O doped Mo 2 CT x MXenes possess a metallic band structure and an optimal hydrogen adsorption, which lead to improved conductivity and electrocatalytic kinetics, respectively. This work not only advances the understanding of property-tuning of the latest two-dimensional MXene materials but also paves the way for the development of MXene-based materials that can be applied in the field of energy conversion and storage.

Table of Content By a facile two-step dissolution-precipitation treatment, novel core-shell S quantum dots/PVK nanocomposites are synthesized.Fig. 5. (a) Nyquist plots of the electrode for the different SQD/PVK nanocomposites, pure PVK and pure sulfur cathode after five cycles from 200 kHz to 100 mHz at room temperature. (b) Rate capabilities of the sulfur electrode and SQD/PVK nanocomposites. Cycling performance of sulfur and SQD/PVK nanocomposites electrode at a rate of 0.2 C (c) and 0.5 C (d).Fig. 6. (a) Typical CV curves of the SQD/PVK-B electrode. (b) Galvanostatic charge/discharge profiles of the SQD/PVK-B electrode at 0.75 C (c) EIS of the SQD/PVK-B electrode at different cycles. (d) Cycling performance of the SQD/PVK-B electrode at a rate of 0.75C. SEM image of the SQD/PVK-B electrode:(e) the fresh electrode, (f) the electrode after 500 cycles at 0.75 C.