A Kinetics‐Tailored Ternary Selenide@Graphene Core–Shell Heterostructured Fibers for High‐Performance Wearable Energy Storage and Biosensing

作者：Fang Li, Kaile Jin, Die Pan, Xiaolin Zhu, Yifan Gao, Zengming Man, Chao Yang, Guan Wu · 发表于：Advanced Functional Materials · 年份：2025 · DOI：10.1002/adfm.202527692 · 被引用次数：4 · 研究领域：Supercapacitor Materials and Fabrication、MXene and MAX Phase Materials、2D Materials and Applications

Abstract Achieving both high energy density and long‐term cycling stability in high performance fiber‐based supercapacitors remains a fundamental challenge, due to the intrinsic trade‐offs between charge storage capacity, structural durability, and rapid reaction kinetics. Here, a novel ternary metal selenides (NiCoCuSe x ) is presented, anchored at reduced graphene oxide (rGO) fibers with a Core–Shell heterostructure, abundant reactive sites, a selenidation‐induced defect‐rich surface, and a synergistic multi‐metal interaction. Benefiting from above, this heterostructured fiber enables efficient charge transport, low diffusion barriers, favorable OH − adsorption energetics, and stable multi‐electron transfer kinetics. As a result, the NiCoCuSe x ‐rGO electrode delivers an exceptional areal capacitance of 8482.97 mF cm −2 and superior cycling stability (93.4% retention after 10 000 cycles). Moreover, the asymmetric solid‐state supercapacitor (ASC) constructed with NiCoCuSe x ‐rGO//rGO electrode achieves a high energy density of 46.88 µWh cm −2 , successfully powering devices including LEDs, watches, and phones. Additionally, the NiCoCuSe x ‐rGO fiber serves as an efficient non‐enzymatic ascorbic acid (AA) sensor, demonstrating high sensitivity (3.69 mA mM −1 cm −2 ), a wide linear response range (0.005–0.1 mM) with low detection limit (0.05 mM) for monitoring AA levels in sweat. This work provides an innovative strategy for designing high‐performance multicomponent metal sele...