Effect of interlayer distance and oxygen content on proton conductivity of graphite oxide

Mohammad Razaul Karim, Md Saidul Islam, Kazuto Hatakeyama, Masaaki Nakamura, Ryo Otani, Michio Koinuma, Shinya Hayami

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

The effect of interlayer distance and oxygen content on proton conductivity of graphite oxide is presented. Bulk-state proton conductivities were measured using coin-shaped pellets of three different graphite oxide samples, namely, H-GO, S-GO, and B-GO, generated respectively from the techniques of Hummers, Staudenmaier, and Brodie. The extent of oxidation, nature of functional groups, interlayer distances, and morphologies are studied through Raman spectroscopy, XPS, powder XRD pattern, and SEM images. The proton conductivities follow the trend H-GO > S-GO > B-GO. In the XPS study, the total oxygen contents were found to follow the trend H-GO > B-GO > S-GO, whereas the interlayer distances obtained from the powder XRD patterns show the trend H-GO > S-GO > B-GO. Beside the nature of the functional groups and extent of oxidation, the interlayer distance displays a significant effect on the proton conductivity values. The temperature-dependent Arrhenius plots reveal the activation energy (Ea) of the samples as 0.274, 0.291, and 0.296 eV. These low Ea values imply the Grotthuss mechanism for proton conduction. The high conductivity value and low activation energy of H-GO with a maximum interlayer distance indicate that hydronium ion's rotational movement and re-formation of hydrogen bonds by the Grotthuss mechanism are supported by a more flexible interlayer. We propose that this physical insight might be considered to improve the proton conductivity through modulating layer distances not only in carbon allotropes but also in other materials.

Original languageEnglish
Pages (from-to)21976-21982
Number of pages7
JournalJournal of Physical Chemistry C
Volume120
Issue number38
DOIs
Publication statusPublished - Sep 29 2016
Externally publishedYes

Fingerprint

Proton conductivity
Graphite
Oxides
interlayers
graphite
Oxygen
conductivity
protons
oxides
oxygen
Powders
Functional groups
trends
X ray photoelectron spectroscopy
Activation energy
Oxidation
Arrhenius plots
hydronium ions
activation energy
oxidation

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

Karim, M. R., Islam, M. S., Hatakeyama, K., Nakamura, M., Otani, R., Koinuma, M., & Hayami, S. (2016). Effect of interlayer distance and oxygen content on proton conductivity of graphite oxide. Journal of Physical Chemistry C, 120(38), 21976-21982. https://doi.org/10.1021/acs.jpcc.6b06301

Effect of interlayer distance and oxygen content on proton conductivity of graphite oxide. / Karim, Mohammad Razaul; Islam, Md Saidul; Hatakeyama, Kazuto; Nakamura, Masaaki; Otani, Ryo; Koinuma, Michio; Hayami, Shinya.

In: Journal of Physical Chemistry C, Vol. 120, No. 38, 29.09.2016, p. 21976-21982.

Research output: Contribution to journalArticle

Karim, MR, Islam, MS, Hatakeyama, K, Nakamura, M, Otani, R, Koinuma, M & Hayami, S 2016, 'Effect of interlayer distance and oxygen content on proton conductivity of graphite oxide', Journal of Physical Chemistry C, vol. 120, no. 38, pp. 21976-21982. https://doi.org/10.1021/acs.jpcc.6b06301
Karim, Mohammad Razaul ; Islam, Md Saidul ; Hatakeyama, Kazuto ; Nakamura, Masaaki ; Otani, Ryo ; Koinuma, Michio ; Hayami, Shinya. / Effect of interlayer distance and oxygen content on proton conductivity of graphite oxide. In: Journal of Physical Chemistry C. 2016 ; Vol. 120, No. 38. pp. 21976-21982.
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