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RISS 인기검색어
- 검색키워드
- 저자 : K. Vijaya Sankar (검색결과 4 건)
- 무료
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Sankar, K. Vijaya,Lee, S.C.,Seo, Y.,Ray, C.,Liu, S.,Kundu, A.,Jun, S.C. Elsevier Sequoia 2018 Journal of Power Sources Vol. No.
<P><B>Abstract</B></P> <P>One-dimensional (1D) nanostructure exhibits excellent electrochemical performance because of their unique physico-chemical properties like fast electron transfer, good rate capability, and cyclic stability. In the present study, Co<SUB>3</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB> 1D nanograsses are grown on Ni foam using a simple and eco-friendly hydrothermal technique with different reaction times. The open space with uniform nanograsses displays a high areal capacitance, rate capability, energy density, and cyclic stability due to the nanostructure enhancing fast ion and material interactions. Ex-situ microscope images confirm the dependence of structural stability on the reaction time, and the nanograsses promoted ion interaction through material. Further, the reproducibility of the electrochemical performance confirms the binder-free Co<SUB>3</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB> 1D nanograsses to be a suitable high-performance cathode material for application to hybrid supercapacitor. Finally, the assembled hybrid supercapacitor exhibits a high energy density (26.66 Wh kg<SUP>−1</SUP> at 750 W kg<SUP>−1</SUP>) and longer lifetimes (80% retained capacitance after 6000 cycles). Our results suggests that the Co<SUB>3</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB> 1D nanograss design have a great promise for application to hybrid supercapacitor.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Binder-free cobalt phosphate cathode for hybrid supercapacitor. </LI> <LI> Stable structure and good electrochemical interaction confirmed via morphology. </LI> <LI> Uniform and direct growth enhances the electrochemical performance. </LI> <LI> The OH<SUP>−</SUP> ions more favor for large energy storage than NO<SUB>3</SUB> <SUP>−</SUP> ions. </LI> <LI> Ex-situ analysis confirms the influence of morphology on cyclic stability. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Multicolor emissive carbon dot with solvatochromic behavior across the entire visible spectrum
Kundu, Aniruddha,Park, Byeongho,Oh, Juyeong,Sankar, K. Vijaya,Ray, Chaiti,Kim, Wook Sung,Chan Jun, Seong Elsevier 2020 Carbon Vol.156 No.-
<P><B>Abstract</B></P> <P>Carbon dots (CDs) are a new class in carbonaceous family and have instigated remarkable research interests over the past decade both from fundamental and technological point of view due to its astonishing photoluminescence (PL) property, though the underlying PL mechanisms for CD are strongly disputed. Herein, we have synthesized nitrogen functionalized CDs (N-CDs) utilizing a facile and one-step hydrothermal approach. The synthesized CDs exhibit excellent solubility in a series of organic solvents and we have extensively investigated the CD-solvent interactions to understand the solvatochromic behavior of CDs which have hardly been studied. Our CDs show excitation wavelength and solvent dependent PL across nearly the entire visible spectrum without compromising the PL quantum yield (CD shows high quantum yield for both blue and red region in some selected solvents). The origin and spectral shift of PL property in different solvents are also thoroughly studied. These observations suggest that the hydrogen bonding between N-CDs and protic solvents is the primary driving force in controlling the PL in the system whereas both dipolar interaction and hydrogen bond acceptance basicity (β) of aprotic.</P> <P>solvents are to be counted for the irregular PL behavior of CDs. Interestingly, the CD-polymer solutions also provide better quantum yield compare to the bare CD which suggests that by monitoring the interaction between CD and polymer in different solvents we can tune the PL property of CD which can find potential applications in diverse fields.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Kundu, Aniruddha,Lee, Jungpyo,Park, Byeongho,Ray, Chaiti,Sankar, K. Vijaya,Kim, Wook Sung,Lee, Soo Hyun,Cho, Il-Joo,Jun, Seong Chan Elsevier 2018 JOURNAL OF COLLOID AND INTERFACE SCIENCE - Vol.513 No.-
<P><B>Abstract</B></P> <P>Luminescent nanomaterials are encouraging scaffolds for diverse applications such as chemical sensors and biosensors, imaging, drug delivery, diagnostics, catalysis, energy, photonics, medicine, and so on. Carbon dots (CDs) are a new class of luminescent carbonaceous nanomaterial that have appeared recently and reaped tremendous scientific interest. Herein, we have exploited a simple approach to prepare tuneable and highly fluorescent CDs via surface functionalization. The successful synthesis of CDs is manifested from several investigations like high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The CDs exhibit excellent water solubility and with increasing nitrogen content fluorescence quantum yield increases whereas cell toxicity decreases. The CD synthesized at high temperature (180 °C) shows very high quantum yield (more than 56%). The tuneable optical properties of CDs are systematically studied using UV-vis and fluorescence spectroscopy. The cell viability evaluation and <I>in vitro</I> imaging study reveals that the synthesized CDs can be employed as a potential fluorescent probe for bio-imaging without further modification.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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