期刊
APPLIED SURFACE SCIENCE
卷 488, 期 -, 页码 221-227出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2019.05.259
关键词
Graphene oxide; Supercapacitors; DFT; Electrochemistry
类别
资金
- major research project of University Grants Commission [43-407/2014 (SR)]
- UGC-DAE CSR, Indore [CSR/CRS87/201415/594]
- UGC-DAE CSR, Mumbai center [UDCSR/MUM/CD/CRSM-263/2017/1036]
- UGC
- DST, Government of India, New Delhi through UGC SAP DRS-I program
- DST, Government of India, New Delhi through FIST Level-I program
Novel FeVO4 and rGO-FeVO4 nanocomposite are synthesized by co-precipitation method and sonochemical method post co-precipitation and modified Hummer's method. The structural and morphological studies were carried out by X-Ray Diffraction (XRD), Raman spectroscopy and Scanning Electron Microscopic (SEM) measurements. XRD studies confirm that FeVO4 is in single phase having triclinic crystal structure with space group P-1(2). Raman spectra of FeVO4, GO, and rGO-FeVO4 nanocomposite show characteristic peaks of FeVO4, GO and both FeVO4 & GO signatures together, respectively. Electrochemical characterization of the samples is done by using Cyclic Voltammetric (CV), Galvanometric Charging Discharging (GCD) and Electrochemical Impedance Spectroscopic (EIS) analysis methods. Cyclic voltammogram of rGO-FeVO4 nanocomposite manifests the pseudo-capacitor nature. The specific capacitance of rGO-FeVO4 nanocomposite is found to be 189.10 F/g @ 0.5 mA/cm(2) while of FeVO4 was 97.54F/g @ 0.5 mA/cm(2). A two-fold increase in specific capacitance is found for rGO-FeVO4 composite as compared to FeVO4. Extensive DFT simulations were carried out to study the structural and electronic properties of FeVO4 and rGO-FeVO4 hybrid structure and to bring theoretical insight for the enhanced specific capacitance in the hybrid structure.
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