Abstract
Bimetallic selenide with core–shell structure (CoSe2/ZnSe/NC@ZnSe/NC) has been successfully prepared through facile carbonization and selenization processes of its core–shell metal–organic framework precursors, in which the precursor is synthesized by epitaxial growth of zinc-based zeolite imidazolate framework (ZIF-8) on the surface of cobalt-based and zinc-based zeolite imidazolate framework (ZIF-67@ZIF-8). The core–shell structure has the advantage of alleviating the volume expansion during repeated insertion and extraction of sodium ions which can effectively avoid structural collapse. Additionally, bimetallic selenides and heterostructure are effective strategies to greatly improve the rate capability of the material. Therefore, the core–shell structural CoSe2/ZnSe/NC@ZnSe/NC material can maintain the original dodecahedron structure and delivers a specific capacity of 308.6 mAh·g−1 at 1.0 A·g−1 after 300 cycles with the desirable capacity retention of 90%. With the synergistic effects of heterostructure and core–shell structure, CoSe2/ZnSe/NC@ZnSe/NC exhibits better electrochemical performance than CoSe2/ZnSe/NC and CoSe2/NC. These prove that both core–shell structure and heterostructure have positive effects on improving the electrochemical properties of materials.
Graphical abstract
摘要
以外延生长法制备了核壳结构ZIF8-ZIF67@ZIF8金属有机骨架前驱体, 然后通过简单的碳化和硒化过程成功制备了具有核壳结构的双金属硒化物(CoSe2/ZnSe/NC@ZnSe/NC)。该核壳结构可以有效减轻电极充放电过程中的体积膨胀, 因此可有效避免电极结构的坍塌。同时, 构筑双金属硒化物和异质结构可以有效提高电池材料的倍率性能。因此, 核壳结构的CoSe2/ZnSe/NC@ZnSe/NC电极材料不仅能够保持原有的十二面体结构, 在1.0A·g−1电流密度下循环300次后仍能保持308.6 mAh·g−1的单位容量, 容量保持率达到90%。在异质结构和核壳结构的协同作用下, CoSe2/ZnSe/NC@ZnSe/NC表现出比CoSe2/ZnSe/NC和CoSe2/NC更加优异的电化学性能。进一步证明了核壳结构和异质结构对材料的电池性能有着更加显著的影响。
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (Nos. 52101243 and 51563002), the Natural Science Foundation of Guangdong Province (Nos. 2020A1515010886 and 2021A1515010078), the Scientific and Technological Plan of Guangdong Province, China (No. 2019B090905007), and the Science and Technology Planning Project of Guangzhou (No. 202102010373).
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Liang, HJ., Li, XT., Zheng, WZ. et al. Rational design of heterostructured core–shell Co-Zn bimetallic selenides for improved sodium-ion storage. Rare Met. 41, 3381–3390 (2022). https://doi.org/10.1007/s12598-022-02035-9
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DOI: https://doi.org/10.1007/s12598-022-02035-9