Title of Paper:Direct growth of highly dispersed MnCl2 center dot 4H(2)O nanostructures with different morphologies on graphene in supercritical CO2

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Date of Publication:2016-06-01

Journal:MATERIALS RESEARCH EXPRESS

Included Journals:SCIE

Volume:3

Issue:6

ISSN No.:2053-1591

Key Words:supercritical CO2; graphene; co-solvent; ultra-small nanoparticles

Abstract:Willow leaf-like Mn3O4 nanoplates@graphene nanocomposites were synthesized using graphene instead of graphene oxide as initial materials with the assistance of supercritical CO2. The near-zero surface tension and the gas-like viscosity of supercritical CO2 favored the intercalation and dispersion of precursors among the graphene nanosheets. In addition, MnCl2 center dot 4H(2)O ultra-small nanoparticles with diameter of 1-3 nm were supported on graphene using MnCl2 center dot 4H(2)O as precursor, supercritical CO2 as solvent and methanol as co-solvent under very moderate conditions. It was also found that the specific capacitance of the MnCl2 center dot 4H(2)O ultra-small nanoparticles@graphene with a metal loading of only 12.4% was twice that of pure graphene. In addition, the capacitance retention ratio of the MnCl2 center dot 4H(2)O ultra-small nanoparticles@graphene composite decreased by only 5.4% when the cycle number increased from 200 to 1000.