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https://hdl.handle.net/2440/118363
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Type: | Journal article |
Title: | 3D Hollow α-MnO₂ framework as an efficient electrocatalyst for lithium–oxygen batteries |
Author: | Bi, R. Liu, G. Zeng, C. Wang, X. Zhang, L. Qiao, S.Z. |
Citation: | Small, 2019; 15(10):e1804958-1-e1804958-7 |
Publisher: | Wiley |
Issue Date: | 2019 |
ISSN: | 1613-6810 1613-6829 |
Statement of Responsibility: | Ran Bi, Guoxue Liu, Cheng Zeng, Xinping Wang, Lei Zhang, Shi‐Zhang Qiao |
Abstract: | Lithium-oxygen (Li-O2 ) batteries are attracting more attention owing to their superior theoretical energy density compared to conventional Li-ion battery systems. With regards to the catalytically electrochemical reaction on a cathode, the electrocatalyst plays a key role in determining the performance of Li-O2 batteries. Herein, a new 3D hollow α-MnO2 framework (3D α-MnO2 ) with porous wall assembled by hierarchical α-MnO2 nanowires is prepared by a template-induced hydrothermal reaction and subsequent annealing treatment. Such a distinctive structure provides some essential properties for Li-O2 batteries including the intrinsic high catalytic activity of α-MnO2 , more catalytic active sites of hierarchical α-MnO2 nanowires on 3D framework, continuous hollow network and rich porosity for the storage of discharge product aggregations, and oxygen diffusion. As a consequence, 3D α-MnO2 achieves a high specific capacity of 8583 mA h g-1 at a current density of 100 mA g-1 , a superior rate capacity of 6311 mA h g-1 at 300 mA g-1 , and a very good cycling stability of 170 cycles at a current density of 200 mA g-1 with a fixed capacity of 1000 mA h g-1 . Importantly, the presented design strategy of 3D hollow framework in this work could be extended to other catalytic cathode design for Li-O2 batteries. |
Keywords: | 3D framework Li-O2 battery hollow structure α-MnO2 |
Rights: | © 2019 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim |
DOI: | 10.1002/smll.201804958 |
Grant ID: | http://purl.org/au-research/grants/arc/FL170100154 http://purl.org/au-research/grants/arc/DE150101234 |
Published version: | http://dx.doi.org/10.1002/smll.201804958 |
Appears in Collections: | Aurora harvest 4 Chemical Engineering publications |
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