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Estimation of electrochemical charge storage capability of ZnO/CuO/reduced graphene oxide nanocomposites
Author(s) -
Asgar Hassnain,
Deen Kashif Mairaj,
Haider Waseem
Publication year - 2019
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.4961
Subject(s) - nanocomposite , materials science , graphene , x ray photoelectron spectroscopy , microstructure , ternary operation , oxide , chemical engineering , supercapacitor , rod , nanoparticle , capacitance , nanotechnology , composite material , metallurgy , electrode , chemistry , medicine , alternative medicine , pathology , computer science , engineering , programming language
Summary Nanocomposites of ZnO/CuO with rGO were synthesized using sonochemical and thermal treatment methods. The formation of ZnO and CuO phases on the rGO sheets and both ZnO/CuO in the ternary component nanocomposites were confirmed from IR spectroscopy and X‐ray photoelectron spectroscopy. The microstructure of the nanocomposites as revealed by TEM and FE‐SEM suggested that CuO was decorated as nano‐rods, whereas ZnO particles retained the spherical shape. In case of ternary nanocomposite, both nano‐rods and spherical particles were agglomerated on the rGO sheets. The pseudocapacitive behavior of ZnO‐rGO nanocomposite corresponded to relatively higher specific capacitance (344.6 F/g) compared with other nanocomposites. The galvanostatic cyclic charge/discharge (GCD) tests also confirmed that ZnO‐rGO nanocomposite could provide the highest specific energy (21.7 Wh/kg) and power density (129.8 kW/kg) at 0.4 A/g compared with CuO‐rGO and ZnO/CuO‐rGO.