Pom-Pom Flower-like Morphology of δ-MnO<sub>2</sub> with Superior Electrochemical Performances for Rechargeable Aqueous Zinc Ion Batteries
A rechargeable aqueous zinc-ion battery is an encouraging alternative for grid-scale energy storage applications, owing to its advantages of high safety, low cost, and environmental benignity. Since MnO<sub>2</sub> is found to be one of the most efficient intercalation cathode materials...
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MDPI AG
2023-02-01
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| author | Priya Yadav Dimas Putro Jaekook Kim Alok Kumar Rai |
| author_facet | Priya Yadav Dimas Putro Jaekook Kim Alok Kumar Rai |
| author_sort | Priya Yadav |
| collection | DOAJ |
| description | A rechargeable aqueous zinc-ion battery is an encouraging alternative for grid-scale energy storage applications, owing to its advantages of high safety, low cost, and environmental benignity. Since MnO<sub>2</sub> is found to be one of the most efficient intercalation cathode materials for ZIBs, the layered type δ-MnO<sub>2</sub> polymorph exhibits reversible intercalation/de-intercalation of Zn<sup>2+</sup> ions with a high capacity. Unfortunately, the δ-MnO<sub>2</sub> cathode suffers from poor cyclability, low-rate capability, and structural degradation during charge–discharge cycles. Therefore, δ-MnO<sub>2</sub> with Pom-Pom Flower-like morphology have been synthesized using a facile hydrothermal method. The unique morphology of δ-MnO<sub>2</sub> provides a high surface area with numerous reaction sites, leading to excellent electrochemical performance. The obtained results revealed that the δ-MnO<sub>2</sub> electrode retained ~99% of its initial capacity even after 250 cycles, which can be ascribed to the reversible Zn<sup>2+</sup> insertion/de-insertion from the current unique morphology of the layered δ-MnO<sub>2</sub> nanostructure. In addition, the electrochemical and structural investigation also indicates a two-step co-insertion of H<sup>+</sup> and Zn<sup>2+</sup> ions into the interlayer of δ-MnO<sub>2</sub> during the discharge process. Thus, the superior electrochemical performances of the δ-MnO<sub>2</sub> cathode paves a way for the high capacity and a long lifespan of zinc-ion batteries. |
| first_indexed | 2024-03-11T09:09:08Z |
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| last_indexed | 2024-03-11T09:09:08Z |
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| spelling | doaj.art-856e0007af6a4020b6da6e322b6cfcaf2023-11-16T19:08:02ZengMDPI AGBatteries2313-01052023-02-019213310.3390/batteries9020133Pom-Pom Flower-like Morphology of δ-MnO<sub>2</sub> with Superior Electrochemical Performances for Rechargeable Aqueous Zinc Ion BatteriesPriya Yadav0Dimas Putro1Jaekook Kim2Alok Kumar Rai3Department of Chemistry, University of Delhi, Delhi 110007, IndiaDepartment of Materials Science and Engineering, Chonnam National University, 300 Yongbong-dong, Bukgu, Gwangju 500-757, Republic of KoreaDepartment of Materials Science and Engineering, Chonnam National University, 300 Yongbong-dong, Bukgu, Gwangju 500-757, Republic of KoreaDepartment of Chemistry, University of Delhi, Delhi 110007, IndiaA rechargeable aqueous zinc-ion battery is an encouraging alternative for grid-scale energy storage applications, owing to its advantages of high safety, low cost, and environmental benignity. Since MnO<sub>2</sub> is found to be one of the most efficient intercalation cathode materials for ZIBs, the layered type δ-MnO<sub>2</sub> polymorph exhibits reversible intercalation/de-intercalation of Zn<sup>2+</sup> ions with a high capacity. Unfortunately, the δ-MnO<sub>2</sub> cathode suffers from poor cyclability, low-rate capability, and structural degradation during charge–discharge cycles. Therefore, δ-MnO<sub>2</sub> with Pom-Pom Flower-like morphology have been synthesized using a facile hydrothermal method. The unique morphology of δ-MnO<sub>2</sub> provides a high surface area with numerous reaction sites, leading to excellent electrochemical performance. The obtained results revealed that the δ-MnO<sub>2</sub> electrode retained ~99% of its initial capacity even after 250 cycles, which can be ascribed to the reversible Zn<sup>2+</sup> insertion/de-insertion from the current unique morphology of the layered δ-MnO<sub>2</sub> nanostructure. In addition, the electrochemical and structural investigation also indicates a two-step co-insertion of H<sup>+</sup> and Zn<sup>2+</sup> ions into the interlayer of δ-MnO<sub>2</sub> during the discharge process. Thus, the superior electrochemical performances of the δ-MnO<sub>2</sub> cathode paves a way for the high capacity and a long lifespan of zinc-ion batteries.https://www.mdpi.com/2313-0105/9/2/133δ-MnO<sub>2</sub>morphologycathodeaqueous zinc-ion batteries |
| spellingShingle | Priya Yadav Dimas Putro Jaekook Kim Alok Kumar Rai Pom-Pom Flower-like Morphology of δ-MnO<sub>2</sub> with Superior Electrochemical Performances for Rechargeable Aqueous Zinc Ion Batteries Batteries δ-MnO<sub>2</sub> morphology cathode aqueous zinc-ion batteries |
| title | Pom-Pom Flower-like Morphology of δ-MnO<sub>2</sub> with Superior Electrochemical Performances for Rechargeable Aqueous Zinc Ion Batteries |
| title_full | Pom-Pom Flower-like Morphology of δ-MnO<sub>2</sub> with Superior Electrochemical Performances for Rechargeable Aqueous Zinc Ion Batteries |
| title_fullStr | Pom-Pom Flower-like Morphology of δ-MnO<sub>2</sub> with Superior Electrochemical Performances for Rechargeable Aqueous Zinc Ion Batteries |
| title_full_unstemmed | Pom-Pom Flower-like Morphology of δ-MnO<sub>2</sub> with Superior Electrochemical Performances for Rechargeable Aqueous Zinc Ion Batteries |
| title_short | Pom-Pom Flower-like Morphology of δ-MnO<sub>2</sub> with Superior Electrochemical Performances for Rechargeable Aqueous Zinc Ion Batteries |
| title_sort | pom pom flower like morphology of δ mno sub 2 sub with superior electrochemical performances for rechargeable aqueous zinc ion batteries |
| topic | δ-MnO<sub>2</sub> morphology cathode aqueous zinc-ion batteries |
| url | https://www.mdpi.com/2313-0105/9/2/133 |
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