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Ganesh Prasad Awasthi,Deval Prasad Bhattarai,Bikendra Maharjan,김경석,박찬희,김철상 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.72 No.-
Herein, we proposed, for thefirst time, a novel activated carbon (AC) material synthesized from Wisteriasinensis (WS) seeds biomass. Characterizations of the material were carried out by Field-emissionscanning electron microscopy, Transmission electron microscopy, X-ray diffraction, Raman spectroscopy,Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, and Brunauer-Emmett-Teller specific surface area analysis. As-synthesized AC was employed as an electrode material to evaluateits applicability in energy storage devices. Results showed enhanced capacitive performance in an acidicelectrolyte compared to the neutral electrolyte at similar current density. Thus, as-synthesized AC couldbe a suitable material for energy storage applications.
Awasthi, Ganesh Prasad,Kumar, Dinesh,Shrestha, Bishnu Kumar,Kim, Juyeon,Kim, Kyung-Suk,Park, Chan Hee,Kim, Cheol Sang Elsevier 2018 JOURNAL OF COLLOID AND INTERFACE SCIENCE - Vol.518 No.-
<P><B>Abstract</B></P> <P>Mesoporous architectures are remarkable electrode materials for energy storage system due to their large number of active sites and high surface area. Here we report, mesoporous MoS<SUB>2</SUB> particles (pore diameter 34.04 nm) well attached to the surface of thin layered reduced graphene oxide (rGO) via an ultrasonic chemical method for supercapacitor applications. The rGO not only increases the conductivity of MoS<SUB>2</SUB> but also provides a substrate for the attachment of MoS<SUB>2</SUB> with low aggregation. The porous MoS<SUB>2</SUB> provides a large surface area and sufficient way for the fast transport of electrolyte ions toward electrode materials. As a result, the synthesized MoS<SUB>2</SUB>/rGO composites exhibited excellent electrochemical performance with a specific capacitance 314.5 F/g in 2M KOH aqueous solution at a scan rate of 10 mV/s and excellent specific capacitance retention (80.02%) after 1000 cycles in a three electrode system for energy storage applications.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Deval Prasad Bhattarai,Ganesh Prasad Awasthi,Bikendra Maharjan,Joshua Lee,김범수,박찬희,김철상 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.77 No.-
Herein, we report the synthesis of polythiophene nanoparticles (PTh-NPs) by surfactant-free chemicaloxidative polymerization of thiophene at 37 C using ammonium persulphate as oxidant. PTh-NPssynthesized without surfactant were compared to those with surfactant in terms of surface morphology,crystallinity, cytotoxicity and some other aspects. Thermogravimetric analysis showed a good thermalstability of as-synthesized PTh-NPs. In vitro biomineralization revealed the nucleation of calcium andphosphate onto the NPs. Cytotoxicity of PTh-NPs was evaluated by measuring cell viability of preosteoblastMC3T3-E1 and PC12 cell lines. PTh-NPs synthesized without using surfactant exhibited bettercell viability compared to those with surfactant.
Adhikari, Surya Prasad,Awasthi, Ganesh Prasad,Kim, Han Joo,Park, Chan Hee,Kim, Cheol Sang American Chemical Society 2016 Langmuir Vol.32 No.24
<P>We report a direct approach to the fabrication of a composite made of porous TiO2 nanofibers (NFs) and graphitic carbon nitride (g-C3N4) sheets, by means of an angled two-nozzle electrospinning combined with calcination process. Different wt % amounts of g-C3N4 particles in a polymer solution from one nozzle and TiO2 precursors containing the same polymer solution from another nozzle were electrospun and deposited on the collector. Structural characterizations confirm a well-defined morphology of the TiO2/g-C3N4 composite in which the TiO2 NFs are uniformly attached on the g-C3N4 sheet. This proper attachment of TiO2 NFs on the g-C3N4 sheets occurred during calcination. The prepared composites showed the enhanced photocatalytic activity over the photodegradation of rhodamine B and reactive black 5 under natural sunlight. Here, the synergistic effect between the g-C3N4 sheets and the TiO2 NFs having anisotropic properties enhanced the photogenerated electron-hole pair separation and migration, which was confirmed by the measurement of photoluminescence spectra, cyclic voltammograms, and electrochemical impedance spectra. The direct synthesis approach that is established here for such kinds of sheetlike structure and porous NFs composites could provide new insights for the design of high-performance energy conversion catalysts.</P>
Adhikari, Surya Prasad,Awasthi, Ganesh Prasad,Kim, Kyung-Suk,Park, Chan Hee,Kim, Cheol Sang The Royal Society of Chemistry 2018 Dalton Transactions Vol.47 No.13
<P>In this study, a novel composite of Cu-Al layered double hydroxide (LDH) nanosheets and g-C3N4-covered Ni-foam was fabricated <I>via</I> a simple and facile two-step process. First, g-C3N4 sheets were deposited on Ni-foam by <I>via</I> electrodeposition method on a three-electrode system (Ni-foam@g-C3N4) and then, Cu-Al LDH nanosheets were grown on the Ni-foam <I>via in situ</I> redox reaction using a hydrothermal process (Ni-foam@Cu-Al LDH/g-C3N4). The FE-SEM image confirmed that the Cu-Al LDH nanosheets arose vertically and were anchored on the surface of electrodeposited g-C3N4 sheets, thus generating unique 3D porous interconnected networks. The electrochemical capacitive performances of the as-prepared samples were evaluated by cyclic volatammetry (CV), galvanostatic charge/discharge tests, and electrochemical impedance spectra (EIS) Nyquist plots. The specific capacitances of the Ni-foam@Cu-Al LDH/g-C3N4 nanocomposite measured from the CV curve (770.98 F g<SUP>−1</SUP> at 50 mV s<SUP>−1</SUP>) and the galvanostatic charge/discharge curve (831.871 at 0.4 A g<SUP>−1</SUP>) were significantly higher than the others. Moreover, the Ni-foam@Cu-Al LDH/g-C3N4 nanocomposite revealed a remarkable high-current capacitive behavior and the capacitance retention could be maintained at 92.71% even after 5000 cycles of CV. Thus, the obtained results demonstrated that the as-prepared nanocomposite has great potential to be used as a novel supercapacitor electrode.</P>