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Kakati Nitul,Gautam Das,윤영수 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.68 No.2
A blend of poly(vinyl alcohol) (PVA) with diglycidyl ether of bisphenol-A (DGB) in the presence of sulfosuccinic acid (SSA) was investigated as hydrolytically-stable proton-conducting membrane. The PVA modification was carried out by varying the DGB:SSA ratio (20:20, 10:20, and 5:20). A nanocomposite of the blend (20:20) was prepared with sulfonated multiwall carbon nanotubes (viz., 1, 3 and 5 wt%). The water uptake behavior and the proton conductivity of the prepared membranes were evaluated. The ionic conductivity of the membranes and the water uptake behavior depended on the s-MWCNT and the DGB contents. The ionic conductivity showed an enhancement for the blend and for the nanocomposite membrane as compared to the pristine polymer.
Kakati Nitul,윤영수 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.68 No.2
Core-shell RuNi@Pt nanoparticles were synthesized on multiwall carbon nanotubes by using an ionic-liquid-assisted polyol synthesis method. The catalysts were characterized by using transmission electron microscopy. The synthesized catalysts were very active towards electrocatalytic oxidation of methanol. The catalytic activities were found to increase with decreasing Pt content on the shells of the nanoparticles. The electrocatalytic activities of the RuNi@Pt/MWCNTs were higher than those of PtRuNi/MWCNTs with higher amounts of Pt.
Himangshu Kakati,Ajay Mandal,Sukumar Laik 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.35 No.-
The transportation and storage of gas in a safe, efficient and cost-effective manner is always a challenge. Gas hydrate has been considered as a good alternative for storage and transportation media of naturalgas. But the main disadvantage of this method is the slow rate of hydrate formation. Therefore, for large-scale industrial application purposes, the present investigation focuses on increasing the rate of hydrateformation and amount of gas consumed by adding aluminum oxide (Al2O3) and zinc oxide (ZnO)nanoparticle to water. Three different concentrations (0.1, 0.4 and 0.8% (wt)) of nanoparticles in aqueoussolution have been studied to know their effect on the kinetics of CH4 + C2H6 + C3H8 hydrate formation. To stabilize the prepared solution, 0.03% (wt) SDS has been added to the aqueous solution. The resultsshow that addition of both the nanoparticles increases the gas consumption rate and amount of gasconsumed. The amount of gas consumed in presence of both the nanoparticle increases by almost 121%compared with that of pure water system. The storage capacity also increases with the addition of bothnanoparticles. Induction time and hydrate growth rate have also been discussed.
Maiti, Jatindranath,Kakati, Nitul,Woo, Sung Pil,Yoon, Young Soo Elsevier 2018 Composites science and technology Vol.155 No.-
<P><B>Abstract</B></P> <P>A new hybrid composite proton exchange membrane has been synthesized from dihydrogen phosphate functionalized imidazolium ionic liquid (IL-H<SUB>2</SUB>PO<SUB>4</SUB>), graphene oxide, and Nafion 117 solution. The chemical structure and thermal stability of the dihydrogen phosphate functionalized imidazolium ionic liquid (IL-H<SUB>2</SUB>PO<SUB>4</SUB>) have been analyzed by <SUP>1</SUP>H nuclear magnetic resonance (NMR) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, and thermogravimetric analysis (TGA). The structural, thermal, and surface properties of synthesized membranes have been confirmed by FTIR spectroscopy, X-ray diffraction, TGA, and scanning electron microscopy. The proton exchange membranes have been characterized by their ionic conductivity and unit cell performance. The incorporation of IL-H<SUB>2</SUB>PO<SUB>4</SUB> and graphene oxide in the Nafion membrane increases its thermal stability. The ionic conductivity of the membranes increases with temperature and amount of IL-H<SUB>2</SUB>PO<SUB>4</SUB>. The highest ionic conductivity of 0.061 Scm<SUP>−1</SUP> has been achieved at 110 °C under anhydrous conditions which is 1.3 times higher than that of commercial Nafion 117. The synthesized membrane, Nafion/IL/GO, shows the best unit cell performance with a power density of 0.02 W cm<SUP>−2</SUP>, which is 13 times higher than that of the commercial Nafion 117 membrane at 110 °C.</P>
A New Approach: Li2S-P2S5 Thin-Films Prepared by Thermal Evaporation as Solid Electrolytes
우성필,NITUL KAKATI,김인예,이석희,윤영수 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.4
Li2S-P2S5 thin-film solid electrolytes are synthesized by using room-temperature thermal evaporation for use as lithium-ion conductors for all-solid-state Li-ion batteries. The local structures of 75.51Li2S:24.49P2S5 and 77.64Li2S:22.36P2S5 prepared in this way have hetero units that facilitate lithium-ion mobility. The lithium-ion conductivity at room temperature for the 77.64Li2S:22.36P2S5 thin-film (4.0 × 10−6 S cm−1) is higher than that for the 75.51Li2S:24.49P2S5 thin-film (1.2 × 10−6 S cm−1). The increased ion conductivity in the 77.64Li2S:22.36P2S5 film is due to the additional local P2S4− 7 structure that forms a glassy state during the thermal evaporation process. The local structure can lead to a high mobility of Li+ ions in the Li2S-P2S5 system due to the non-bridging sulfide ions. Lithium-ion-conducting thin-films prepared by using thermal evaporation, as reported in this study, are promising solid electrolytes.
Lee, S.,Woo, S.,Kakati, N.,Lee, Y.,Yoon, Y. Elsevier Sequoia 2016 Surface & coatings technology Vol.303 No.1
A carbon/ceramic multilayer is deposited onto the stainless steel to enhance the corrosion and electrical properties of metallic bipolar plates under polymer electrolyte membrane fuel cells (PEMFCs). The multilayer is composed of 1.22μm CrN and 7nm carbon layers. The corrosion durability tests conducted in an aggressive environments of the PEMFC reveal that a low corrosion current density of 0.12 and 0.07μAcm<SUP>-2</SUP> is obtained for the multilayers at anodic and cathodic conditions, respectively, and the highest protective efficiency of 99.80% is recorded in the cathodic condition. Furthermore, the interfacial contact resistance of the carbon/ceramic multilayer is also reduced significantly, by seventeen times, compared to bare stainless steel. A low value of ICR is maintained even after corrosion tests. These tests show that the carbon/ceramic multilayer deposited onto the stainless steel improve the corrosion resistance of the metal substrate and lead to high surface conductivity in the aggressive environments of the PEMFC.