The paper presents the heterogeneous engineering of MnSe@NC@ReS₂ core–shell nanowires for advanced sodium-ion (SIBs) and potassium-ion (PIBs) batteries. The authors successfully synthesized these nanowires by growing ReS₂ nanosheets on the surface of MnSe@NC nanowires, which exhibit excellent Na⁺/K⁺ storage performance. As anode materials, the MnSe@NC@ReS₂ nanowires maintained a specific capacity of 300 mAh·g⁻¹ after 400 cycles at 1.0 A·g⁻¹ for SIBs and 120 mAh·g⁻¹ after 900 cycles at 1.0 A·g⁻¹ for PIBs. The 1D-2D hybrid structure enhances the specific surface area, improves mechanical strength, and accelerates ion migration, making these nanowires promising candidates for high-performance anode materials in SIBs and PIBs. The synthesis process involves the preparation of MnO nanowires, MnSe@NC nanowires, and finally, the MnSe@NC@ReS₂ heterostructure nanowires through a series of chemical and thermal treatments.The paper presents the heterogeneous engineering of MnSe@NC@ReS₂ core–shell nanowires for advanced sodium-ion (SIBs) and potassium-ion (PIBs) batteries. The authors successfully synthesized these nanowires by growing ReS₂ nanosheets on the surface of MnSe@NC nanowires, which exhibit excellent Na⁺/K⁺ storage performance. As anode materials, the MnSe@NC@ReS₂ nanowires maintained a specific capacity of 300 mAh·g⁻¹ after 400 cycles at 1.0 A·g⁻¹ for SIBs and 120 mAh·g⁻¹ after 900 cycles at 1.0 A·g⁻¹ for PIBs. The 1D-2D hybrid structure enhances the specific surface area, improves mechanical strength, and accelerates ion migration, making these nanowires promising candidates for high-performance anode materials in SIBs and PIBs. The synthesis process involves the preparation of MnO nanowires, MnSe@NC nanowires, and finally, the MnSe@NC@ReS₂ heterostructure nanowires through a series of chemical and thermal treatments.