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RISS 인기검색어
- 검색키워드
- 저자 : Tolendra Kshetri (검색결과 7 건)
- 무료
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Kshetri, Tolendra,Thanh, Tran Duy,Singh, Soram Bobby,Kim, Nam Hoon,Lee, Joong Hee Elsevier 2018 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.345 No.-
<P><B>Abstract</B></P> <P>The development of new advanced nanostructures based on the hybridization of different carbon nanomaterials to obtain enhanced performance of energy storage devices has attracted considerable attention. Herein, a hierarchical nanostructure of carbon nanotubes supported electrospun carbon nanofiber networks (CNTs@CNFs) was successfully fabricated by using two facile techniques: – electrospinning and chemical vapor deposition (CVD). Such CNTs@CNFs hybrid showed the uniform and high density of CNTs directly grown on the surface of carbon nanofiber networks, leading to the formation of a hierarchical nanostructure with a large surface area and highly porous characteristics. The enhanced interactions between the CNTs and the CNFs networks were found to improve the electrical conductivity and electrochemical stability of the material. Owing to its unique nanoarchitectures and physicochemical properties, the CNTs@CNFs hybrid was demonstrated to be a potential electrode material for an electrochemical capacitor, in which a high specific capacitance of 464.2 F g<SUP>−1</SUP> at 0.5 A g<SUP>−1</SUP> and long-term stability with 97% retention after 10,000 repeated charge–discharge cycles were achieved. The obtained results suggest that the present CNTs@CNFs hybrid is a promising candidate for an electrochemical capacitor in energy storage technologies.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A hierarchical nanostructure of CNTs@CNFs has been successfully fabricated. </LI> <LI> The CNTs@CNFs has large surface area and strong interfaces between hybrids. </LI> <LI> It shows a high specific capacitance of 464.2 F g<SUP>−1</SUP> at 0.5 A g<SUP>−1</SUP> and stability. </LI> </UL> </P>
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Thakur, Suman,Kshetri, Tolendra,Kim, Nam Hoon,Lee, Joong Hee Elsevier 2017 Journal of catalysis Vol.345 No.-
<P><B>Abstract</B></P> <P>We demonstrate the sustainable production of H<SUB>2</SUB>O<SUB>2</SUB> without organic electron donors by a CdS-reduced graphene oxide (RGO) photocatalyst in sunlight with water and oxygen as resources. Photocatalysts were prepared with various amounts of RGO (0–30wt.% with respect to CdS) by a hydrothermal method. A photocatalyst containing 20wt.% RGO (CdS-G2) showed maximum activity, and the amount of H<SUB>2</SUB>O<SUB>2</SUB> produced (128μM) was almost five times higher than that produced by CdS nanoparticles (27μM) after 12h sunlight irradiation. The results clearly revealed that the photocatalytic reactionmainly proceeds by two-electron reduction of oxygenrather than water oxidation on the catalyst surface. The effects of reaction temperature and pH on the production of H<SUB>2</SUB>O<SUB>2</SUB> were also investigated. We found that the production of H<SUB>2</SUB>O<SUB>2</SUB> was enhanced at lower temperature and pH. The concentration of H<SUB>2</SUB>O<SUB>2</SUB> reachedto 164 and 156μM with CdS-G2 at 10°C and pH 2, respectively.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Preparation of CdS-based photocatalysts by a hydrothermal method. </LI> <LI> Production of hydrogen peroxide from water and oxygen. </LI> <LI> Temperature- and pH-dependent production of hydrogen peroxide. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Li, Xuyang,Bandyopadhyay, Parthasarathi,Kshetri, Tolendra,Kim, Nam Hoon,Lee, Joong Hee The Royal Society of Chemistry 2018 Journal of Materials Chemistry A Vol.6 No.43
<P>A hydroxylated boron nitride (BN(OH)x) functionalized <I>p</I>-phenylenediamine modified reduced graphene oxide (rGO) filler (BN(OH)x-PrGO) is synthesized for the first time using a facile and novel strategy. BN(OH)x-PrGO/polyurethane (PU) composite films are prepared using different filler loadings <I>via</I> a solution casting technique. BN(OH)x-rGO/PU and BN(OH)x/PU composite films are also prepared in order to compare the reinforcing effects of different fillers. FESEM and TEM analyses show the excellent dispersion and compatibility of BN(OH)x-PrGO sheets in the PU matrix. The tensile strength and modulus of the composite film show 62% and 95% enhancement, respectively, following the inclusion of 3 wt% BN(OH)x-PrGO compared to those of the pure PU film. The BN(OH)x-PrGO/PU composite films exhibit outstanding oxygen gas barrier properties, ideal dielectric properties, and excellent anti-corrosion performances. In particular, the <SUP>3</SUP>BN(OH)x-PrGO/PU film shows nearly 91% reduction in the O2 transmission rate compared to the PU film. The permeability of O2 through the composite film is correlated with the diffusivity, solubility and Bharadwaj model. The dielectric constant (at 10<SUP>3</SUP> Hz) increases from 6.8 for the pure PU film to 13.1 for the <SUP>3</SUP>BN(OH)x-PrGO/PU composite, and the dielectric loss also remains low for the composite. The potentiodynamic polarization curve shows a substantial shift of the corrosion potential of <SUP>3</SUP>BN(OH)x-PrGO/PU-coated steel towards the anodic direction compared to the PU film, and it exhibits an ultralow corrosion rate (6.14 × 10<SUP>−5</SUP> mm per year) and excellent corrosion inhibition efficiency (99.96%) in saline solution.</P>
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Embedded PEDOT:PSS/AgNFs network flexible transparent electrode for solid-state supercapacitor
Singh, Soram Bobby,Kshetri, Tolendra,Singh, Thangjam Ibomcha,Kim, Nam Hoon,Lee, Joong Hee Elsevier 2019 Chemical engineering journal Vol.359 No.-
<P><B>Abstract</B></P> <P>Energy storage devices that offer high energy storage capacity along with high electro-optical and mechanical performance is still a great challenge as a power source for transparent electronic gadgets. Here, we report the fabrication of an ultra-flexible, lightweight embedded PEDOT:PSS/AgNFs/NOA 63 hybrid transparent supercapacitor electrode (HTSE) film by using a peel-off transfer process technique. The HTSE film shows a good electro-optical performance, the sheet resistance of Rs ∼2.12 Ω/sq at 84.65% transmittance, along with excellent mechanical bending and flexibility characteristics. The HTSE film shows a negligible change in resistance, only a ∼1% increase in resistance is observed after 10,000 bending cycles at a bending radius of 2.0 mm. The HTSE film also exhibits good electrochemical performance with an areal capacitance of 3.64 mF/cm<SUP>2</SUP> at 84.65% transmittance. The fabricated supercapacitor device also exhibits excellent mechanical flexibility, only <1.5% decrease in areal capacitance after 5000 repeated bending cycles at 2.0 mm bending radius. Owing to the high electro-optical, electrochemical and mechanical properties of the HTSE film, the fabricated solid-state supercapacitor device shows high transparency, good electrochemical performance, and long cyclic stability. The HTSE film will be a potential electrode for future transparent portable energy power source, and other flexible transparent electronic devices, an alternative to ITO.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ultra-flexible PEDOT:PSS/AgNFs/NOA63 network was fabricated by the peel-off transfer process. </LI> <LI> High electro-optical performance with R<SUB>st</SUB> of ∼2.12 Ω/sq at 84.7% transmittance was obtained. </LI> <LI> The supercapacitor exhibits high areal capacitance (0.91 mF/cm<SUP>2</SUP>) with high bending stability. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Thanh, Tran Duy,Chuong, Nguyen Dinh,Hien, Hoa Van,Kshetri, Tolendra,Tuan, Le Huu,Kim, Nam Hoon,Lee, Joong Hee Elsevier 2018 Progress in materials science Vol.96 No.-
<P><B>Abstract</B></P> <P>Recently, the research effort on two-dimensional transition metal dichalcogenides/graphene (2D-TMDs/Gr) hybrids has grown. These hybrids are emerging as a promising strategy for the preparation of advanced multifunctional materials with effectively upgraded properties, as well as performances. Due to their outstanding electrical, physical, and chemical properties, these materials have been extensively considered for various applications, both in academia, and industry. This review systematically assesses the important progress to date in the development of 2D-TMDs/Gr hybrids. The synthesis methods of 2D-TMDs/Gr hybrids for fabricating diverse types of nanostructured architectures are highlighted. In addition, the relationships between morphological and structural characteristics, and the physicochemical properties of 2D-TMDs/Gr hybrids, are recognized in detail. This review also discusses recent prospective applications of the 2D-TMDs/Gr hybrids in the areas of energy storage, energy conversion, energy harvesting technologies, and sensors. In summary, although there are still challenges for optimizing the synthesis process and performance of the 2D-TMDs/Gr hybrids, they offer unique candidates for a wide range of promising applications in the future.</P>
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