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RISS 인기검색어
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- 저자 : Ramesh Prabhu M. (검색결과 2 건)
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K. Selva Kumar,M. Ramesh Prabhu 한국고분자학회 2021 Macromolecular Research Vol.29 No.2
Polybenzimidazole (PBI)-sulfonated nano titania (S-TiO2) polymer composite membranes have been prepared by solvent casting technique for high temperature polymer electrolyte membrane (HT-PEM) fuel cells. X-Ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy was used to characterize the polymer structure and confirm the complexation of the sulfonated titania inside the polymer matrix. The highest proton conductivity obtained was 0.091 S cm-1 at 160 oC. The temperature dependent proton conductivity of the phosphoric acid doped proton conducting polymer electrolyte exhibits an Arrhenius relation and Grotthuss mechanism. Thermal gravimetric analysis (TGA) showed that all the prepared proton conducting polymer membrane exhibit good thermal stability. The morphological behaviors of the prepared proton conducting polymer electrolytes were depicted by scanning electron microscope (SEM) micrograph. The prepared composite membranes were characterized by proton conductivity, durability and mechanical strength. The acid uptake of the PBI-sulfonated titania blended membrane was found to be higher than that of the pristine PBI. The fabricated composite membrane with the highest conductivity exhibited a maximum current density of 0.89 A cm-2 through the high proton conductivity.
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Maheshwaran G.,Seethalakshmi G.,Kousalya Devi V.,VenkataKrishna Lappasi Mohanram,Ramesh Prabhu M.,Krishna Kumar M.,Sudhahar S. 한국물리학회 2022 Current Applied Physics Vol.36 No.-
The fabrication of high performance supercapacitor electrodes has been greatly investigated for future high power storage applications. In this present work, chromium oxide-cobalt oxide based nanocomposite (Cr2O3–Co3O4 NC) was synthesized using the hydrothermal approach. Moreover, the cyclic voltammetry (CV) study reveals the Cr2O3–Co3O4 NC delivers a high specific capacitance of 619.4 F/g at 10 mV/s. The electrochemical impedance spectra (EIS) of Cr2O3–Co3O4 NC possess the solution resistance (Rs) and charge transfer resistance (Rct) of 0.68 Ω and 0.03 Ω respectively. The Galvanostatic charge-discharge (GCD) analysis demonstrated the prolonged charge-discharge time and good rate capability of the Cr2O3–Co3O4 NC. The cyclic stability of Cr2O3–Co3O4 NC delivers superior capacitive retention of 83% even after 2000 cycles. The asymmetric supercapacitor (ASC) device based on Cr2O3–Co3O4//AC yielded an energy density of 4.3 Wh/kg at the corresponding power density of 200 W/kg. Furthermore, the ASC delivers superior cyclic stability of 74.8% even after 1000 consecutive charge-discharge cycles.
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