Issue 19, 2017

Interactions of ionic liquids and surfaces of graphene related nanoparticles under high pressures

Abstract

High-pressure infrared spectroscopy was used to study the interactions between 1-methyl-3-propylimidazolium iodide [MPIM]I and graphene-based nanoparticles. The results obtained at ambient pressure indicate the imidazolium ring of the cation to be a more favorable moiety for adsorption than alkyl C–H groups at ambient pressure. Upon increasing the pressure, the dominant C2–H band of pure [MPIM]I yields a significant red frequency shift. As the mixtures, i.e., graphene oxide (GO)/[MPIM]I, reduced graphene oxide (RGO)/[MPIM]I, and graphene (G)/[MPIM]I, were compressed, mild shifts in the C2–H absorption frequency were observed. The absence of drastic red-shifts suggests that the local C2–H structures may be perturbed by the addition of GO, RGO, and G under high pressures. When pure [MPIM]I was compressed from ambient to 0.4 GPa, the alkyl C–H band at ca. 2964 cm−1 was blue-shifted to 2984 cm−1. This discontinuous jump occurring around 0.4 GPa becomes less obvious for the mixtures GO/[MPIM]I, RGO/[MPIM]I, and G/[MPIM]I. The results of this study suggest that the addition of GO, RGO, and G can disturb the local structures of alkyl C–H under high pressures, demonstrating that high pressures may have the potential to tune the strength of ionic liquid–surface interactions and the performance of energy storage devices (e.g. supercapacitors).

Graphical abstract: Interactions of ionic liquids and surfaces of graphene related nanoparticles under high pressures

Supplementary files

Article information

Article type
Paper
Submitted
14 Feb 2017
Accepted
12 Apr 2017
First published
12 Apr 2017

Phys. Chem. Chem. Phys., 2017,19, 12269-12275

Interactions of ionic liquids and surfaces of graphene related nanoparticles under high pressures

H. Chang and D. Hsu, Phys. Chem. Chem. Phys., 2017, 19, 12269 DOI: 10.1039/C7CP00978J

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements