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Choi, Mugyeom,Koppala, Siva Kumar,Yoon, Dohyeon,Hwang, Jieun,Kim, Seung Min,Kim, Jaehoon Elsevier 2016 Journal of Power Sources Vol.309 No.-
<P><B>Abstract</B></P> <P>A simple and effective approach for the tight anchoring of molybdenum disulfide (MoS<SUB>2</SUB>) to the surface of supercritical-alcohol-reduced graphene oxide (SRGO) is developed. The MoS<SUB>2</SUB>-SRGO composites are synthesized by the one-pot deposition of MoO<SUB>2</SUB> on SRGO and simultaneous reduction of GO to SRGO in supercritical methanol followed by sulfurization. The obtained MoS<SUB>2</SUB>-SRGO composites contain a crystalline MoS<SUB>2</SUB> phase comprising 11–14 layers of MoS<SUB>2</SUB>. In addition, the composites have mesoporous structures with high porosities, ranging between 55 and 57%. In comparison with bare MoS<SUB>2</SUB> and SRGO, the MoS<SUB>2</SUB>-SRGO composites have enhanced electrochemical performances due to their mesoporous structures and the synergetic effect between MoS<SUB>2</SUB> and SRGO sheets. When tested as the anode in a secondary lithium battery, it shows high reversible capacity of 896 mAh g<SUP>−1</SUP> at 50 mA g<SUP>−1</SUP> after 50 cycles, a high rate capacity of 320 mAh g<SUP>−1</SUP> at a high charge-discharge rate of 2.5 A g<SUP>−1</SUP>, and long-term cycling of 724 mAh g<SUP>−1</SUP> at 50 mA g<SUP>−1</SUP> after 200 cycles. This unique synthetic approach effectively and tightly anchors MoS<SUB>2</SUB> nanoparticles to the SRGO surface, resulting in improved structural integrity, electron transfer efficiency between the SRGO sheets and MoS<SUB>2</SUB>, and Li-ion diffusion kinetics.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A simple supercritical methanol route is used for tight anchoring of MoS<SUB>2</SUB> to RGO. </LI> <LI> RGO prevents restacking of MoS<SUB>2</SUB> layer, resulting in mesoporous structure. </LI> <LI> The MoS<SUB>2</SUB>–RGO composite exhibits reversible capacity of 896 mA g<SUP>−1</SUP> at 50 mA g<SUP>−1</SUP>. </LI> <LI> Charge transfer kinetics of MoS<SUB>2</SUB>–RGO improved an order of magnitude than bare MoS<SUB>2</SUB>. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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A Cluster-Based Routing Strategy Using Gravitational Search Algorithm for WSN
A. Kavitha,Koppala Guravaiah,R. Leela Velusamy 한국정보과학회 2020 Journal of Computing Science and Engineering Vol.14 No.1
The emergence of wireless sensor networks (WSNs) increasingly attracts many researchers. A big challenging issue in the WSN is to replace the sensor nodes when they run out of energy. Hence, it is indispensable to design a cluster-based routing for WSN so as to prolong the lifetime of a network. In this study, a clustered routing approach is proposed to attain energy efficiency by applying gravitational search algorithm (GSA). GSA has been used for assigning sensor nodes to an appropriate cluster head (CH) in a load-balanced way such that it reduces the energy consumption and hence enhances the lifetime of a network. The proposed approach outperforms popular clustering approaches, such as LEACHC, DEEC, (ACH)2, HCCRFD, and GSA-EC, relating to various performance parameters, such as network lifetime, energy dissipation and the number of packets sent to base station.
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송창근,Siva Kumar Koppala,윤종원 한양대학교 세라믹연구소 2013 Journal of Ceramic Processing Research Vol.14 No.6
Multiphase TiO2 nanofibers were fabricated by electrospinning and subsequent calcination of as-spun nanofibers. The obtained TiO2 nanofibers were characterized by X-diffraction (XRD), Field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). The photocatalytic activity was assessed using methylene blue (MB) degradation in solar light irradiation. With increasing calcination temperature the diameter of the nanofibers decreased. The experimental results of MB degradation demonstrated that the solar light driven photocatalytic activity of TiO2 nanofibers was enhanced up to 500 o C calcination temperature, and thereafter calcination decreased the photocatalytic activity owing to increase in the rutile phase. A mixed phase (76 : 24) comprised of anatase and rutile phase is more preferable for photocatalysis. The enhanced photocatalytic activity is owing to hindered charge recombination by means of electron transform from anatase phase to rutile phase at trapping states.
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