Preparation of multi-shelled ZnMn2O4 hollow spheres@Ni(OH)2 nanosheets for high-performance hybrid supercapacitors

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science Pub Date : 2024-12-20 DOI:10.1016/j.apsusc.2024.162170

Feng Zuo, Huidong Xie, Changyu Hu, Kang Chen, Hanyu Yang, Kangkang Wang, Guoping Han, Hu Liu

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Abstract

Herein, multi-shelled ZnMn₂O₄ hollow nanospheres were synthesized via a mixed solvothermal method using colloidal carbon spheres as templates. Subsequently, a layer of Ni(OH)₂ nanoflakes was densely grown on the surface of the ZnMn₂O₄ nanospheres through a secondary hydrothermal process, yielding a heterostructure nanoflower-like ZnMn₂O₄@Ni(OH)₂ electrode material. ZnMn₂O₄@Ni(OH)₂ shows high specific capacitance through the synergistic mechanism that the multi-shelled ZnMn₂O₄ nanospheres act as “charge storage” and the Ni(OH)₂ nanosheets act as “charge transducers” to quickly introduce charges into the ZnMn₂O₄ nanospheres. The resulting ZnMn₂O₄@Ni(OH)₂ electrode material exhibits a specific capacitance of 816.36 F g⁻¹ at a current density of 1 A g⁻¹, which is higher than that of individual ZnMn₂O₄ hollow nanospheres and Ni(OH)₂ nanoflakes. An asymmetric supercapacitor device was fabricated by integrating the ZnMn₂O₄@Ni(OH)₂ nanoflowers with activated carbon. The device demonstrated a high energy density of 74.8 Wh·kg⁻¹ at a power density of 3240 W·kg⁻¹ and a long cycle life of 75 % capacitance retention after 5000 cycles. The simple synthesis route and excellent performance of the ZnMn₂O₄@Ni(OH)₂ electrode material show strong potential for future energy storage applications. The results provide the future energy-storage devices with excellent electrochemical properties by the hetero-growth of transitional metal oxides/hydroxides.

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来源期刊

Applied Surface Science 工程技术-材料科学：膜

CiteScore

12.50

自引率

7.50%

发文量

3393

审稿时长

67 days

期刊介绍： Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.