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Graphene and graphite oxide based composites for application in energy systems
Author(s) -
Singh Arvinder,
Chandra Amreesh
Publication year - 2013
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201200972
Subject(s) - graphene , materials science , dielectric spectroscopy , cyclic voltammetry , supercapacitor , raman spectroscopy , graphite , scanning electron microscope , oxide , graphene oxide paper , graphite oxide , composite material , composite number , energy storage , electrode , nanotechnology , chemical engineering , electrochemistry , chemistry , metallurgy , optics , power (physics) , physics , engineering , quantum mechanics
Abstract Graphene composites with metal or ceramics are being widely investigated for applications in electronic and energy devices. In this paper, we report the chemical synthesis of graphene and graphite oxide (GO)/ZnO‐Ag composites for application in energy storage devices, viz., supercapacitors (SCs). Results of surface modification and morphological studies carried out using Raman spectroscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM) data are discussed. The electrochemical performance of these electrode materials in SCs have been investigated using electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and galvanostatic charge‐discharge techniques. Performance of the GO/ZnO‐Ag composite has been compared with that of the pure graphene in terms of achievable energy and power density. Results show that opening of the GO sheets with ZnO spacer allows storage of more charge than achievable in pure graphene. Silver acts as a catalyst to enhance electrochemically active sites in the electrode material as well as helps in maintaining reasonable electronic conductivity. This is an important feature for the development of high performance SCs since GO/ZnO‐Ag composite is a low‐cost reproducible material in comparison to graphene.