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Synthesis and Characterization of Graphene/Binary Metal Molybdate (Graphene/Zn 1−x Ni x MoO 4 ) Nanocomposite for Supercapacitors
Author(s) -
Reddy B. Joji,
Vickraman Palanisamy,
Justin A. Simon
Publication year - 2019
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201800595
Subject(s) - graphene , materials science , molybdate , supercapacitor , nanocomposite , electrochemistry , metal , raman spectroscopy , inorganic chemistry , chemical engineering , electrode , analytical chemistry (journal) , nanotechnology , metallurgy , chemistry , organic chemistry , physics , engineering , optics
A novel graphene/binary metal molybdate (Zn 1‐x Ni x MoO 4 ) is synthesized via a facile and simple microwave synthesis route ( x = 0.0, 0.2, 0.4, 0.6, 0.8). Electrochemical studies are performed for all the samples to study their charge storage mechanism and frequency dependence in a three‐electrode set up with 2 m KOH electrolyte solution. Among the samples, Zn 0.6 Ni 0.4 MoO 4 shows better electrochemical performance which is combined with graphene so as to obtain graphene/Zn 1‐x Ni x MoO 4 ( x = 0.4) nanocomposite. XRD and Raman analyses have confirmed formation of complexation of graphene/binary metal molybdate nanocomposite. TEM morphological profile illustrates little aggregation and interconnected layers of graphene interspersed with rice‐like grains of binary metal molybdate. Graphene/Zn 1‐x Ni x MoO 4 ( x = 0.4) exhibits good energy density and power density of 62.3 Wh kg −1 and 448.5 W kg −1 respectively with a specific capacitance of 555.5 F g −1 at 1 A g −1 . The electrode material with good cyclic stability of 85% even after 5000 charge/discharge cycles may be explored as a novel option for supercapacitors.