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Issue 25, 2017
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Porphyrin–graphene oxide frameworks for long life sodium ion batteries

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Abstract

Herein, we demonstrate that a porphyrin interspersed graphene-oxide framework with a d-spacing of ∼7.67 Å can significantly enhance the cycling stability of graphene-based anodes in sodium-ion batteries. These robust electrodes can deliver a reversible capacity of ∼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.

Graphical abstract: Porphyrin–graphene oxide frameworks for long life sodium ion batteries

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Publication details

The article was received on 17 Mar 2017, accepted on 22 May 2017 and first published on 22 May 2017


Article type: Paper
DOI: 10.1039/C7TA02370G
Citation: J. Mater. Chem. A, 2017,5, 13204-13211
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    Porphyrin–graphene oxide frameworks for long life sodium ion batteries

    N. A. Kumar, R. R. Gaddam, M. Suresh, S. R. Varanasi, D. Yang, S. K. Bhatia and X. S. Zhao, J. Mater. Chem. A, 2017, 5, 13204
    DOI: 10.1039/C7TA02370G

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