Role of hydrophilic groups in acid intercalated graphene oxide as a superionic conductor

Kosuke Wakata, Md Saidul Islam, Mohammad Razaul Karim, Kazuto Hatakeyama, Nurun Nahar Rabin, Ryo Otani, Masaaki Nakamura, Michio Koinuma, Shinya Hayami

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Hybrid materials that are obtained from intercalation of different polar and hydrophilic acid guest molecules within graphene oxide (GO) have been found to exhibit high proton conductivity. The accommodation of these guest precursors within the GO interlayer takes place through weak physical forces. PXRD patterns with enhanced interlayer distance confirmed successful intercalation processes. Raman and IR spectral data reveal the absence of any covalent bond between the functional groups of the guest and the GO host. TGA data confirms improved water adsorbing capacity of the hybrids. At ambient conditions and 90% relative humidity (RH), a RH dependent impedance study shows that intercalation of formic acid (FA) and phosphoric acid (PA) within GO results in ∼7 times higher proton conductivity compared with that for the pristine GO sample. The low activation energy values suggest that proton conduction in the samples is aided by the Grotthuss mechanism. Improvement in the water adsorbing capacity is primarily responsible for such high proton conductivity. The current study suggests that cheap and environmentally friendly GO-based intercalated hybrid materials, such as GO/PA and GO/FA with enhanced proton conductivity, can be appropriate replacements for the expensive Nafion-based solid electrolytes.

Original languageEnglish
Pages (from-to)21901-21905
Number of pages5
JournalRSC Advances
Volume7
Issue number35
DOIs
Publication statusPublished - Jan 1 2017
Externally publishedYes

Fingerprint

Graphite
Oxides
Graphene
formic acid
Acids
Proton conductivity
Intercalation
Formic acid
Hybrid materials
Phosphoric acid
Atmospheric humidity
Covalent bonds
Water
Solid electrolytes
Functional groups
Protons
Activation energy
Molecules

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Wakata, K., Islam, M. S., Karim, M. R., Hatakeyama, K., Rabin, N. N., Otani, R., ... Hayami, S. (2017). Role of hydrophilic groups in acid intercalated graphene oxide as a superionic conductor. RSC Advances, 7(35), 21901-21905. https://doi.org/10.1039/c7ra01634d

Role of hydrophilic groups in acid intercalated graphene oxide as a superionic conductor. / Wakata, Kosuke; Islam, Md Saidul; Karim, Mohammad Razaul; Hatakeyama, Kazuto; Rabin, Nurun Nahar; Otani, Ryo; Nakamura, Masaaki; Koinuma, Michio; Hayami, Shinya.

In: RSC Advances, Vol. 7, No. 35, 01.01.2017, p. 21901-21905.

Research output: Contribution to journalArticle

Wakata, K, Islam, MS, Karim, MR, Hatakeyama, K, Rabin, NN, Otani, R, Nakamura, M, Koinuma, M & Hayami, S 2017, 'Role of hydrophilic groups in acid intercalated graphene oxide as a superionic conductor', RSC Advances, vol. 7, no. 35, pp. 21901-21905. https://doi.org/10.1039/c7ra01634d
Wakata, Kosuke ; Islam, Md Saidul ; Karim, Mohammad Razaul ; Hatakeyama, Kazuto ; Rabin, Nurun Nahar ; Otani, Ryo ; Nakamura, Masaaki ; Koinuma, Michio ; Hayami, Shinya. / Role of hydrophilic groups in acid intercalated graphene oxide as a superionic conductor. In: RSC Advances. 2017 ; Vol. 7, No. 35. pp. 21901-21905.
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