Porphyrin–graphene oxide frameworks for long life sodium ion batteries

Herein, we demonstrate that a porphyrin interspersed graphene-oxide framework with a d-spacing of similar to 7.67 Aa can significantly enhance the cycling stability of graphene-based anodes in sodium-ion batteries. These robust electrodes can deliver a reversible capacity of similar to 200 mA h g-1...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2017, Vol.5 (25), p.13204-13211
Main Authors: Kumar, Nanjundan Ashok, Gaddam, Rohit Ranganathan, Suresh, Moorthy, Varanasi, Srinivasa Rao, Yang, Dongfang, Bhatia, Suresh K, Zhao, X S
Format: Article
Language:English
Subjects:
Current density
Electrodes
Fading
Mathematical analysis
Oxides
Rechargeable batteries
Renewable energy
Sodium
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Summary:Herein, we demonstrate that a porphyrin interspersed graphene-oxide framework with a d-spacing of similar to 7.67 Aa can significantly enhance the cycling stability of graphene-based anodes in sodium-ion batteries. These robust electrodes can deliver a reversible capacity of similar to 200 mA h g-1 at a current density of 100 mA g-1 in the 20th cycle with negligible capacity fading over 700 cycles. In addition to the superior rate tolerance, the specific capacity was stable even after a resting time of one month. The excellent performance may be nested in the larger interlayer spacing, and rich nitrogen content along with the defect sites available for sodium interaction. Experimental studies and density functional theory calculations presented in this work give insights into the structure-property relationship of porphyrin-graphene oxide frameworks and their electrochemical performance.
ISSN:2050-7488
2050-7496
DOI:10.1039/c7ta02370g