Research Article

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2019, 12(6): 1347–1353

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https://doi.org/10.1007/s12274-019-2303-1

Inverse opal manganese dioxide constructed by few-layered ultrathin nanosheets as high-performance cathodes for aqueous zinc-ion batteries

Hao Ren1, Jin Zhao1, Lan Yang1, Qinghua Liang1, Srinivasan Madhavi1,2 (*), and Qingyu Yan1,2 (*)

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1 School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
2 Energy Research Institute (ERI@N), Nanyang Technological University, Singapore 637553, Singapore

Keywords: inverse opal, ultrathin, few-layered nanosheets, MnO2, zinc ion batteries
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  • Abstract
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Considering the high safety, low-cost and high capacity, aqueous zinc ion batteries have been a potential candidate for energy storage ensuring smooth electricity supply. Herein, we have synthesized inverse opal manganese dioxide constructed by few-layered ultrathin nanosheets by a solution template method at mild temperature. The ultrathin nanosheets with the thickness as small as 1 nm are well separated without obvious aggregation. Used as cathode material for aqueous zinc ion batteries, the few-layered ultrathin nanosheets combined with the inverse opal structure guarantee excellent performance. A high specific discharge capacity of 262.9 mAh·g−1 is retained for the 100th cycle at a current density of 300 mA·g−1 with a high capacity retention of 95.6%. A high specific discharge capacity of 121 mAh·g−1 at a high current density of 2,000 mA·g−1 is achieved even after 5,000 long-term cycles. The ex-situ X-ray diffraction (XRD) patterns, selected-area electron diffraction (SAED) patterns and high-resolution transmission electron microscopy (HRTEM) results demonstrate that the discharge/charge processes involve the reversible formation of zinc sulfate hydroxide hydrate on the cathode while in-plane crystal structure of the layered birnessite MnO2 could be maintained. This unique structured MnO2 is a promising candidate as cathode material for high capacity, high rate capability and long-term aqueous zinc-ion batteries.
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Inverse opal manganese dioxide constructed by few-layered ultrathin nanosheets as high-performance cathodes for aqueous zinc-ion batteries. Nano Res. 2019, 12(6): 1347–1353 https://doi.org/10.1007/s12274-019-2303-1

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