Fiber-based supercapacitors (FSCs) have attracted widespread attention for wearable applications and smart societies due to their high wearability, deformable energy supply, and safety and stability. However, due to the low porosity, active sites, and charge transfer of fibers, the capacity and rate performance of FSCs are both unsatisfactory. This article reports a novel heterostructured carbon-coated tubular carbon nitride embedded graphene fiber (CTg-C3N4@GF) for high-performance FSCs.The CTg-C3N4@GF electrode exhibits an extremely high areal capacitance (3,648 mF cm−2) and rate capability (2,488 mF cm−2 at 50 mA cm−2). In addition, the assembled solid-state FSC can also provide high energy density (296.2 μWh cm−2), cycling stability, and applications in wearable energy supply (for powering clocks and wearable starlight devices).The key to high performance lies in the electronic transfer of the carbon coating; nitrogen materials create abundant active sites, and the hollow nanotubes enhance transport pathways, achieving high ion absorption capacity, low ion diffusion resistance, improved conductivity, fast charge transfer kinetics, and excellent electrochemical reversibility.

Original link

Heterostructured Carbon-Coated Carbon Nitride Hollow Nanotubes Hybrid Microfibers for Ultra-High Capacity/Rate Wearable Energy Storage

Pub Date : 2026-01-04

DOI: 10.1002/adfm.202529151

Jiahui Li,  Haowei Hu,  Zhiyuan Xu,  Kaile Jin,  Xiaolin Zhu,  Zengming Man, Chao Yang,  Yuanyuan Lü,  Guan Wu