Immobilizing primary electroactive nanomaterials in porous carbon matrix is an effective approach for boosting the electrochemical performance of potassium-ion batteries (PIBs) because of the synergy among functional components. Herein, an integrated hybrid architecture composed of ultrathin Cu₃P nanoparticles (~20 nm) confined in porous carbon nanosheets (Cu₃P⊂NPCSs) as a new anode material for PIBs is synthesized through a rational self-designed self-templating strategy. Benefiting from the unique structural advantages including more active heterointerfacial sites, intimate and stable electrical contact, effectively relieved volume change, and rapid K⁺ ion migration, the Cu₃P⊂NPCSs indicate excellent potassium-storage performance involving high reversible capacity, exceptional rate capability, and cycling stability. Moreover, the strong adsorption of K⁺ ions and fast potassium-ion reaction kinetics in Cu₃P⊂NPCSs is verified by the theoretical calculation investigation. Noted, the intercalation mechanism of Cu₃P to store potassium ions is, for the first time, clearly confirmed during the electrochemical process by a series of advanced characterization techniques.

由于功能组件之间的协同作用，将初级电活性纳米材料固定在多孔碳基质中是提高钾离子电池（PIB）电化学性能的有效方法。在此，通过合理的自行设计的自模板策略合成了一种由限制在多孔碳纳米片（Cu ₃ P⊂NPCSs）中的超薄 Cu ₃ P 纳米粒子（~20 nm）组成的集成混合结构，作为 PIB 的新型负极材料。受益于独特的结构优势，包括更活跃的异质界面位点、紧密而稳定的电接触、有效缓解体积变化以及快速的 K ⁺离子迁移，Cu ₃P⊂NPCSs 具有优异的储钾性能，包括高可逆容量、出色的倍率性能和循环稳定性。此外，理论计算研究证实了Cu ₃ P⊂NPCSs中K ⁺离子的强吸附和快速的钾离子反应动力学。注意到，Cu ₃ P 存储钾离子的嵌入机制首次在电化学过程中通过一系列先进的表征技术得到明确证实。