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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高性能混合超级电容器用多壳ZnMn2O4空心spheres@Ni(OH)2纳米片的制备

本文以胶体碳球为模板，采用混合溶剂热法制备了多壳ZnMn2O4空心纳米球。随后，通过二次水热法在ZnMn2O4纳米球表面密集生长一层Ni(OH)2纳米片，得到异质结构纳米花状ZnMn2O4@Ni(OH)2电极材料。ZnMn2O4@Ni(OH)2通过多壳ZnMn2O4纳米球作为“电荷存储”和Ni(OH)2纳米片作为“电荷换能器”快速将电荷引入ZnMn2O4纳米球的协同机制显示出高比电容。所得ZnMn2O4@Ni(OH)2电极材料在电流密度为1 a g−1时的比电容为816.36 F g−1，高于单个ZnMn2O4空心纳米球和Ni(OH)2纳米片。将ZnMn2O4@Ni(OH)2纳米花与活性炭相结合，制备了不对称超级电容器器件。该器件在功率密度为3240 W·kg - 1时具有74.8 Wh·kg - 1的高能量密度，在5000次循环后具有75% %的长循环寿命。ZnMn2O4@Ni(OH)2电极材料具有简单的合成路线和优异的性能，在未来的储能应用中具有很强的潜力。研究结果为过渡金属氧化物/氢氧化物的异质生长提供了未来具有优异电化学性能的储能装置。

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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.