NDLI: Achieving electrochemical capacitor functionality from nanoscale LiMn<sub>2</sub>O<sub>4</sub> coatings on 3-D carbon nanoarchitectures

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Journal of Materials Chemistry A Vol - 1 Issue - 6

Journal of Materials Chemistry A Vol - 1 Issue - 5

Achieving electrochemical capacitor functionality from nanoscale LiMn₂O₄ coatings on 3-D carbon nanoarchitectures

Content Provider	Royal Society of Chemistry (RSC)
Author	Sassin, Megan B. Rolison, Debra R. Pettigrew, Katherine A. Mansour, Azzam N. Stallworth, Phillip E. Greenbaum, Steve G. Hahn, Benjamin P. Long, Jeffrey W.
Copyright Year	2013
Abstract	Conformal nanoscale coatings of Na+-birnessite manganese oxide (MnOx) produced via redox reaction between aqueous permanganate (NaMnO4·H2O) and the carbon surfaces of fiber-paper-supported carbon nanofoams are converted to LiMn2O4 spinel through topotactic exchange of Na+ for Li+ in the as-deposited lamellar birnessite, followed by mild thermal treatments to complete the transformation to LiMn2O4. The evolution of the birnessite-to-spinel conversion is verified with X-ray diffraction, solid-state nuclear magnetic resonance, X-ray absorption spectroscopy, electron microscopy, cyclic voltammetry, and electrochemical impedance spectroscopy. The mild conditions used to convert birnessite to spinel ensure that the conformal nanoscale nature of the oxide coating is retained throughout the macroscopically thick (170 μm) carbon nanofoam substrate during the conversion process. The architecture of the LiMn2O4–carbon nanofoam facilitates rapid ion/electron transport, enabling the LiMn2O4 to insert and extract Li+ from aqueous electrolytes at scan rates as high as 25 mV s−1, and with a relaxation time of 37 s as derived from electrochemical impedance. This architectural expression of nanoscale LiMn2O4 delivers full theoretical capacity (148 mA h g−1) at 2 mV s−1.
Starting Page	2431
Ending Page	2440
Page Count	10
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	1
Issue Number	7
Journal	Journal of Materials Chemistry A
DOI	10.1039/c2ta00937d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Li Birnessite Manganese oxide Redox Potassium permanganate Properties of water Carbon Spinel X-ray crystallography Solid-state nuclear magnetic resonance X-ray absorption spectroscopy Spectroscopy Electron microscope Cyclic voltammetry Electrochemistry Electrical impedance Micrometre Carbon nanofoam Ion
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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