Liquid phase exfoliation of MoO2 nanosheets for lithium ion battery applications

John B. Boland, Andrew Harvey, Ruiyuan Tian, Damien Hanlon, Victor Vega-Mayoral, Beata Szydlowska, Aideen Griffin, Tanja Stimpel-Lindner, Sonia Jaskaniec, Valeria Nicolosi, Georg Duesberg, Jonathan N. Coleman

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

Molybdenum dioxide (MoO2) is a layered material which shows promise for a number of applications in the electrochemical energy storage arena. Mostly studied as a bulk layered material, MoO2 has not previously been exfoliated in large quantities. Here we demonstrate the liquid phase exfoliation of MoO2 in the solvent isopropanol, yielding reasonable amounts of good quality nanosheets. However, we found that, when dispersed in isopropanol under ambient conditions, MoO2 nanosheets are gradually oxidized to higher oxides such as MoO3 over a period of days. Conversely, if the nanosheets are processed into dried films immediately after exfoliation, and before oxidation has had a chance to progress, the nanosheets are relatively stable under ambient conditions, remaining unoxidised unless the films are heated. We also found that MoO2 nanosheets can be size selected by controlled centrifugation and show size-dependent optical properties. This allows us to propose spectroscopic metrics which allow concentration- and size-estimation from extinction spectra. Finally, we found that liquid-exfoliated MoO2 nanosheets could be used to produce lithium ion battery anodes with capacities of up to 1140 mA h g-1.

Original languageEnglish
Pages (from-to)1560-1570
Number of pages11
JournalNanoscale Advances
Volume1
Issue number4
DOIs
StatePublished - 9 Apr 2019
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2019 The Royal Society of Chemistry.

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