摘要
Misfit layer compounds (MLC) exhibit a distinctive alternating stacking structure, fostering mismatched heterointerfaces that synergistically enhance interface charge storage and electrode structural integrity. In this study, we synthesized exfoliated few-layer (BiSe) 1.10 NbSe 2 MLC (FL-(BiSe) 1.10 NbSe 2 MLC) through vacuum solid-state synthesis complemented by point probe ultrasonic processing. By strategically alternating BiSe and NbSe 2 layers, a structured stack with a naturally mismatched heterogeneous interface is achieved. This design leverages a threefold mechanism involving conversion, alloying, and intercalation, contributing to enhanced electrochemical stability of the material. Finite element analysis reveals that the FL-(BiSe) 1.10 NbSe 2 exhibits reduced interfacial stress compared to pure BiSe, ensuring superior structural integrity of BiSe within the NbSe 2 layers. Utilizing the van der Waals gaps within NbSe 2 layers for improved K + migration, the MLC exhibits remarkable rate performance, representing its first successful integration into potassium ion hybrid capacitor (PIHC) components. Consequently, the FL-(BiSe) 1.10 NbSe 2 electrode, serving as the potassium-ion battery (PIB) anode shows a capacity of 191 mA h g −1 at 4 A/g with consistent cyclability, enduring 2000 cycles at a 1 A/g current density in the PIHC configuration. This study provides new insights into the structural strategy for electrodes with conversion, alloying, and intercalation triple mechanisms, in addition to offering a reliable pathway for designing carbon-free potassium-ion intercalation anode materials.