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    ELECTROCHEMICAL EVOLUTION OF FEPO4 SPHERICAL NANO PARTICLES AS EFFICIENT NEGATIVE ELECTRODE MATERIAL FOR HYBRID SUPERCAPACITORS
    (Bhabha Atomic Research Centre (BARC), Mumbai, 2020-01-21) Priyadharsini N
    A newer of FePO4 electrode material have synthesized through facile combustion method for the fabrication of aqueous type hybrid supercapacitors. The phase purity, homogeneity and the functional groups present in the synthesized FePO4 are characterized through X-ray diffraction and FTIR measurements. Field emission scanning electron microscopy (FESEM) images show that there is a uniform and spherical shaped nano particles present in the electrode material. The electrochemical properties of the FePO4 electrode are studied in various alkaline aqueous electrolytes to explore their superior electrochemical performances. Among these aqueous electrolytes, the FePO4 electrode provides a maximum specific capacitance of 400 F g-1 in 1 M NaOH at 2 mV s-1 and also retained about 93% of the initial capacitance value even after 5000 cycles at a current density of 1 mA cm-2. These results suggest that the synthesized sample has higher potential as a newer electrode material for hybrid supercapacitors. By employing FePO4 as a negative electrode in hybrid supercapacitor configuration of FePO4║Co3O4, it exploits an outstanding electrochemical with an enhanced energy density of 18 W h kg−1 at an improved power density of 443 W kg−1 and protracted cyclic stability for about 5000 cycles.
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    ELECTROCHEMICAL ANALYSIS OF FEPO4 SPHERICAL NANO PARTICLES AS EFFICIENT NEGATIVE ELECTRODE MATERIAL FOR HYBRID SUPERCAPACITORS
    (Bhabha Atomic Research Centre (BARC), Mumbai, 2018-09-26) Priyadharsini N
    A battery type electrode material of FePO4 nano particles have synthesized through facile combustion method for the fabrication of aqueous type hybrid supercapacitors. The phase purity, homogeneity and the functional groups present in the synthesized FePO4 are characterized through X-ray diffraction and FTIR measurements. Field emission scanning electron microscopy (FESEM) images show that there is a uniform and spherical shaped nano particles present in the electrode material. The electrochemical properties of the FePO4 electrode are studied in various aqueous electrolytes of 1 M LiOH, 1 M KOH and 1 M NaOH to explore their superior electrochemical performances. Among these aqueous electrolytes, the FePO4 electrode provides a maximum specific capacitance of 400 F g-1 in 1 M NaOH at 2 mV s-1 and also retained about 93% of the initial capacitance value even after 5000 cycles at a current density of 1 mA cm-2. These results suggest that the synthesized sample has higher potential as a newer electrode material for hybrid supercapacitors. By employing FePO4 as a negative electrode in hybrid supercapacitor configuration of FePO4║Co3O4, it exploits an outstanding electrochemical with an enhanced energy density of 18 W h kg−1 at an improved power density of 443 W kg−1 and protracted cyclic stability for about 5000 cycles. The higher electrical conductivity of FePO4║Co3O4 hybrid device is confirmed by the lower charge transfer resistance (5.5 Ω) of EIS measurements, which is slightly increased to 38 Ω after 5000 cycle’s performance. From these results, it is evident that the FePO4║Co3O4 hybrid supercapacitor shows better electrical conductivity, higher diffusion of ions and more charge propagation behaviour.
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    SYNTHESIS AND CHARACTERIZATION OF FEPO4 SPHERICAL NANO PARTICLES AS EFFICIENT ELECTRODE MATERIAL FOR HYBRID SUPERCAPACITOR
    (PSGR Krishnammal College for Women, Coimbatore, 2018-01-03) S, Seema; B, Agnes latha; N, Priyadharsini
    A battery type electrode material of FePO4 nano particles have synthesized through various synthetic routes of combustion, hydrothermal and ultrasonication methods for the design of aqueous supercapacitors. The phase purity, homogeneity and the functional groups present in the synthesized FePO4 are characterized through X-ray diffraction and FTIR measurements. Field emission scanning electron microscopy (FESEM) images show that there is a uniform and spherical shaped nano particles present in the compound synthesized from combustion technique than the remaining samples. The electrochemical properties of the FePO4 electrode are studied in various aqueous electrolytes of 1 M LiOH, 1 M KOH and 1 M NaOH to explore their superior electrochemical performances. Among these alkaline electrolytes, the FePO4 electrode provides a maximum specific capacitance of 400 F g-1 in 1 M NaOH at 2 mV s-1 and also retained about 93% of the initial capacitance value even after 5000 cycles at a current density of 1 mA cm-2. These results suggest that the fabricated electrode material has high potential as a newer electrode material for hybrid supercapacitor.
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    COMBUSTION SYNTHESIS OF NOVEL CATHODE MATERIAL OF KMNPO4 FOR SUPERCAPACITORS
    (CSIR –National Institute for Interdisciplinary Science and Technology (NIIST), Thiruvananthapuram, 2014-02-19) N, Priyadharsini; R, Kalai Selvan
    KMnPO4 has prepared as a unique supercapacitor material because of the extensive electrochemical properties of LiMnPO4, which is proved as a one of the best cathode materials1. The compound was synthesized via combustion synthesis using potassium acetate, manganese acetate and ammonium dihydrogen phosphate as precursors with a fuel of citric acid. Structural, surface morphology were studied by XRD, FTIR and TEM analysis and the sample encompass the structure of triclinic having the space group of P (2). The electrochemical properties were observed using cyclic voltammetry, galvanostatic charge-discharge cycling and electrochemical impedance spectroscopy in a three electrode system at a potential range from -0.6 to 0.6 V vs Hg/HgO. The variation in the electrochemical performance of the sample was studied in three different electrolytes such as 1M LiOH, 1M KOH and 1M NaOH. The result shows that KMnPO4 exhibits higher capacitance of 335 F/g at a scan rate of 2mVs-1 for 1M NaOH. This material shows good specific capacity; replace with all the available Li based Manganese pseudocapacitors which are already proved their recital.