title: Self-Assembled and One-Step Synthesis of Interconnected 3D Network of Fe3O4/Reduced Graphene Oxide Nanosheets Hybrid for High-Performance Supercapacitor Electrode.
abstract: In the present work, we have synthesized three-dimensional (3D) reduced graphene oxide nanosheets (rGO NSs) containing iron oxide nanoparticles (Fe3O4NPs) hybrids (3D Fe3O4/rGO) by one-pot microwave approach. Structural and morphological studies reveal that the as-synthesized Fe3O4/rGO hybrids were composed of faceted Fe3O4NPs induced into the interconnected network of rGO NSs. The morphologies and structures of the 3D hybrids have been characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy and X-ray photoelectron spectrometer (XPS). The electrochemical studies were analyzed by cyclic voltammetry, galvanostatic charge/discharge measurements, and electrochemical impedance spectroscopy, which demonstrate superior electrochemical performance as supercapacitors electrode application. The specific capacitances of 3D hybrid materials was 455 F g-1at the scan rate of 8 mV s-1, which is superior to that of bare Fe3O4NPs. Additionally, the 3D hybrid shows good cycling stability with a retention ratio of 91.4 after starting from ∼190 cycles up to 9600 cycles. These attractive results suggest that this 3D Fe3O4/rGO hybrid shows better performance as an electrode material for high-performance supercapacitors.
authors.affiliation: Centre for Semiconductor Components and Nanotechnology (CCS Nano), University of Campinas (UNICAMP) , 13083-870 Campinas, Sao Paulo, Brazil.
authors.forename: Rajesh
authors.identifier: http://orcid.org/0000-0001-7065-3259
authors.initials: R
authors.lastname: Kumar
authors.affiliation: School of Physical & Material Sciences, Central University of Himachal Pradesh (CUHP) , Kangra, Dharamshala, Himachal Pradesh 176215, India.
authors.forename: Rajesh K
authors.initials: RK
authors.lastname: Singh
authors.affiliation: Centre for Semiconductor Components and Nanotechnology (CCS Nano), University of Campinas (UNICAMP) , 13083-870 Campinas, Sao Paulo, Brazil.
authors.forename: Alfredo R
authors.initials: AR
authors.lastname: Vaz
authors.affiliation: Centre for Semiconductor Components and Nanotechnology (CCS Nano), University of Campinas (UNICAMP) , 13083-870 Campinas, Sao Paulo, Brazil.
authors.forename: Raluca
authors.initials: R
authors.lastname: Savu
authors.affiliation: Centre for Semiconductor Components and Nanotechnology (CCS Nano), University of Campinas (UNICAMP) , 13083-870 Campinas, Sao Paulo, Brazil.
authors.forename: Stanislav A
authors.initials: SA
authors.lastname: Moshkalev
keywords: 3D Fe3O4/rGO hybrids; faceted Fe3O4 nanoparticles; interconnected network; microwave; reduced graphene oxide; supercapacitor