biostudies-literatureYu XFundamental Research Funds for the Central UniversitiesNatural Science Foundation of ChinaNational Natural Science Foundation of Chinae2205556https://www.ebi.ac.uk/biostudies/studies/S-EPMC9929274biostudies-literatureUnknown10(5)Iron group metals chalcogenides, especially NiS, are promising candidates for K-ion battery anodes due to their high theoretical specific capacity and abundant reserves. However, the practical application of NiS-based anodes is hindered by slow electrochemical kinetics and unstable structure. Herein, a novel structure of Ni₃ S₂ -Ni hybrid nanosphere with intra-core voids encapsulated by N-doped carbon shells (Ni₃ S₂ -Ni@NC-AE) is constructed, based on the first electrodeposited NiS nanosphere particles, dopamine coating outer layer, oxygen-free annealing treatment to form Ni₃ S₂ -Ni core and N-doped carbon shell, and selective etching of the Ni phase to form intra-core void. The electron/K⁺ transport and K<sup>+</Advanced science (Weinheim, Baden-Wurttemberg, Germany)Ni₃ S₂ -Ni Hybrid Nanospheres with Intra-Core Void Structure Encapsulated in N-Doped Carbon Shells for Efficient and Stable K-ion Storage.PMC9929274FRF-MP-20-175180402351874020FRF‐BD‐22‐02FRF‐MP‐20‐17FRF-BD-22-02Ren XWang MHou XYang TYu XYuan ZfalseNi₃ S₂ -Ni Hybrid Nanospheres with Intra-Core Void Structure Encapsulated in N-Doped Carbon Shells for Efficient and Stable K-ion Storage.Iron group metals chalcogenides, especially NiS, are promising candidates for K-ion battery anodes due to their high theoretical specific capacity and abundant reserves. However, the practical application of NiS-based anodes is hindered by slow electrochemical kinetics and unstable structure. Herein, a novel structure of Ni₃ S₂ -Ni hybrid nanosphere with intra-core voids encapsulated by N-doped carbon shells (Ni₃ S₂ -Ni@NC-AE) is constructed, based on the first electrodeposited NiS nanosphere particles, dopamine coating outer layer, oxygen-free annealing treatment to form Ni₃ S₂ -Ni core and N-doped carbon shell, and selective etching of the Ni phase to form intra-core void. The electron/K⁺ transport and K<sup>+</2023-01-01T00:00:00Z2023 Feb2025-04-04T11:16:58.318Z2025-04-04T11:16:58.318ZS-EPMC99292743658797610.1002/advs.202205556