Synthesis of graphene via ultra-sonic exfoliation of graphite oxide and its electrochemical characterization

Hassnain Asgar, K. M. Deen, Usman Riaz, Zia Ur Rahman, Umair Hussain Shah, Waseem Haider

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

A direct method of producing graphene from graphite oxide (GO) via ultra-sonication is presented in this work. The synthesis of graphene was validated through IR, XRD, Raman, and XPS analyses. Moreover, the diffraction pattern obtained from TEM also validated the formation of graphene with characteristics (002) plane. The electrochemical behavior of GO and graphene was evaluated by electrochemical impedance spectroscopy and linear sweep voltammetry in 0.5M KOH solution. The relatively larger effective pseudocapacitance and broad current peak exhibited by GO in the LSV plots was related with the dominant adsorption of ‘Hads’ during reduction of water. It has been considered that large overpotential and relatively higher current response exhibited by GO compared to graphene was associated with the preferential adsorption of Hads in the presence of surface functional groups.

Original languageEnglish
Pages (from-to)7-11
Number of pages5
JournalMaterials Chemistry and Physics
Volume206
DOIs
StatePublished - Feb 15 2018

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