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Title: | Facile synthesis and the exploration of the zinc storage mechanism of β-MnO2 nanorods with exposed (101) planes as a novel cathode material for high performance eco-friendly zinc-ion batteries† |
Authors: | Islam, Saiful Alfaruqi, Muhammad Hilmy Mathew, Vinod Song, Jinju Kim, Sungjin Pham, Duong Tung Jo, Jeonggeun Kim, Seokhun Baboo, Joseph Paul Putro, Dimas Yunianto Sun, Yang-kook Kim, Jaekook |
Keywords: | Beta MnO2, DFT Zinc ion batteries |
Issue Date: | 10-Oct-2017 |
Publisher: | RSC |
Citation: | 171 |
Abstract: | Aqueous Zn-ion batteries (ZIBs) have emerged as promising and eco-friendly next-generation energy storage systems to substitute lithium-ion batteries. Therefore, discovering new electrode materials for ZIBs with high performance and unraveling their electrochemical reactions during Zn-ion insertion/extraction are of great interest. Here, we present, for the first time, tunnel-type β-MnO2 nanorods with exposed (101) planes, prepared via a facile microwave-assisted hydrothermal synthesis within only 10 min, for use as a high performance cathode for ZIBs. In contrast to its bulk counterpart, which showed no electrochemical reactivity, the present β-MnO2 nanorod electrode exhibited a high discharge capacity of 270 mA h g−1 at 100 mA g−1, high rate capability (123 and 86 mA h g−1 at 528 and 1056 mA g−1, respectively), and long cycling stability (75% capacity retention with 100% coulombic efficiency at 200 mA g−1) over 200 cycles. The Zn-ion storage mechanism of the cathode was also unraveled using in situ synchrotron, ex situ X-ray diffraction, ex situ X-ray photoelectron spectroscopy, and ex situ X-ray absorption spectroscopy. Our present study indicates that Zn intercalation occurred via a combination of solid solution and conversion reactions. During initial cycles, the β-MnO2 cathode was able to maintain its structure; however, after prolonged cycles, it transformed into a spinel structure. The present results challenge the common views on the β-MnO2 electrode and pave the way for the further development of ZIBs as cost-effective and environmentally friendly next-generation energy storage systems. |
URI: | http://dspace.aiub.edu:8080/jspui/handle/123456789/181 |
ISSN: | 20507496, 20507488 |
Appears in Collections: | Publication: Journal |
Files in This Item:
File | Description | Size | Format | |
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11. Beta MnO2.docx | 3.54 MB | Microsoft Word XML | View/Open |
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