电化学
水溶液
介孔材料
化学
热液循环
化学工程
插层(化学)
离子
阴极
锌
电解质
无机化学
纳米技术
材料科学
电极
催化作用
有机化学
物理化学
工程类
作者
Yao Chen,Ze-Hua Lu,Tongzhou Chen,Yong Liu,Guangting Han,Gang Xu
标识
DOI:10.1016/j.jelechem.2022.117084
摘要
δ-MnO2 (K0.44Mn2O4·1.5H2O) hierarchical nanoflowers self-assembled with nanosheets were synthesized via a template-free hydrothermal route by using a mixture suspension of KMnO4 and MnSO4·H2O as precursors. The primary δ-MnO2 nanosheets spread along (0 0 1) plane with a thickness of ca. 2–5 nm. It is argued that the intercalations of K+ ions and water molecules among the interlayers of MnO6 octahedrons make the layered lattice structure of δ-MnO2 much stable, resulting in the δ-MnO2 hierarchical nanoflowers. The enlarged interlayer spacings effectively activate the storage of Zn2+ ions in the δ-MnO2 hierarchical nanoflowers. As cathodes for aqueous zinc ion batteries, thus, the δ-MnO2 hierarchical nanoflowers exhibit excellent electrochemical performances. The Zn//δ-MnO2 battery can deliver a high specific capacity of 293.6 mAh/g at a current density of 0.3 A/g and still maintains 217.8 mAh/g after 100 cycles. Besides, a high rate capacity of 84.6 mAh/g can be achieved at 3 A/g. It is believed that but for the promotion of Zn2+ ions diffusion by expanding interlayer spacings, the high specific area and mesoporous structure of the hierarchical architecture of the δ-MnO2 nanoflowers strongly improve the electrochemical performances through fully contacting with the electrolytes.
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