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Type: Journal article
Title: Three-dimensional MnO₂ ultrathin nanosheet aerogels for high-performance Li-O₂ batteries
Other Titles: Three-dimensional MnO(2) ultrathin nanosheet aerogels for high-performance Li-O(2) batteries
Author: Chen, S.
Liu, G.
Yadegari, H.
Wang, H.
Qiao, S.
Citation: Journal of Materials Chemistry A, 2015; 3(6):2559-2563
Publisher: Royal Society of Chemistry
Issue Date: 2015
ISSN: 2050-7488
Statement of
Sheng Chen, Guoxue Liu, Hossein Yadegari, Haihui Wang and Shi Zhang Qiao
Abstract: Two-dimensional (2D) ultrathin nanocrystals represent a family of emerging nanomaterials with many proposed applications; however, the interlayer re-stacking between sheets greatly decreases the performance during practical operation. This work demonstrates a facile strategy to solve this challenging problem by rational assembly of 2D nanocrystals into three-dimensional (3D) aerogels, which paves the way for harvesting excellent structural properties of both nanostructures and macrostructures. The resultant 3D MnO₂ aerogel shows significantly increased discharge capacity in Li-air batteries in comparison to its powder-like counterpart (4581.4 vs. 3902.6 mA h g⁻¹), which outperforms many MnO₂ and other transition metal-based electrocatalysts. Meanwhile, the as-fabricated Li-air cell demonstrates good rate capability and cycle life. Further mechanism study reveals that the improved performance is associated with ultrathin MnO₂ nanosheets which allow highly exposed catalytic centres, as well as its excellent aerogel structure with rich porosity and a 3D continuous network that maximizes the utilization of MnO₂ species for catalytic reactions. This study may open up new opportunities for making full use of 2D nanocrystals for a number of energy storage/conversion techniques.
Rights: This journal is © The Royal Society of Chemistry 2015
RMID: 0030032605
DOI: 10.1039/c5ta00004a
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Appears in Collections:Chemical Engineering publications

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