Three-dimensional MnO2 ultrathin nanosheet aerogels for high-performance Li-O-2 batteries

Chen, Sheng, Liu, Guoxue, Yadegari, Hossein, Wang, Haihui and Qiao, Shi Zhang (2015) Three-dimensional MnO2 ultrathin nanosheet aerogels for high-performance Li-O-2 batteries. Journal of Materials Chemistry A, 3 6: 2559-2563. doi:10.1039/c5ta00004a


Author Chen, Sheng
Liu, Guoxue
Yadegari, Hossein
Wang, Haihui
Qiao, Shi Zhang
Title Three-dimensional MnO2 ultrathin nanosheet aerogels for high-performance Li-O-2 batteries
Formatted title
Three-dimensional MnO2 ultrathin nanosheet aerogels for high-performance Li-O-2 batteries
Journal name Journal of Materials Chemistry A   Check publisher's open access policy
ISSN 2050-7488
2050-7496
Publication date 2015-02-14
Year available 2015
Sub-type Article (original research)
DOI 10.1039/c5ta00004a
Open Access Status Not Open Access
Volume 3
Issue 6
Start page 2559
End page 2563
Total pages 5
Place of publication Cambridge, United Kingdom
Publisher RSC Publications
Language eng
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.
Formatted 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.
Keyword Chemistry, Physical
Energy & Fuels
Materials Science, Multidisciplinary
Chemistry
Energy & Fuels
Materials Science
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID DP140104062
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Non HERDC
Australian Institute for Bioengineering and Nanotechnology Publications
 
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Citation counts: TR Web of Science Citation Count  Cited 44 times in Thomson Reuters Web of Science Article | Citations
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