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Ramadoss, Ananthakumar,Kim, Taehyun,Kim, Gui-Shik,Kim, Sang Jae The Royal Society of Chemistry 2014 NEW JOURNAL OF CHEMISTRY Vol.38 No.6
<P>In the present work, we have synthesized a mesoporous molybdenum disulfide (MoS<SUB>2</SUB>) nanostructure by a facile hydrothermal route for supercapacitor applications. FE-SEM and TEM images confirmed the mesoporous morphologies of the as-prepared samples. The electrochemical measurements showed that the as-prepared mesoporous MoS<SUB>2</SUB> electrode delivered maximum capacitances of 376 and 403 F g<SUP>−1</SUP> at a scan rate of 1 mV s<SUP>−1</SUP> in 1 M Na<SUB>2</SUB>SO<SUB>4</SUB> and KCl electrolyte solutions respectively, which indicated that the mesoporous MoS<SUB>2</SUB> nanostructure was a suitable electrode material for supercapacitor applications.</P> <P>Graphic Abstract</P><P>We have developed a facile route to synthesise a mesoporous MoS<SUB>2</SUB> nanostructure, which exhibited maximum specific capacitances of 376 and 403 F g<SUP>−1</SUP> at a scan rate of 1 mV s<SUP>−1</SUP> in 1 M Na<SUB>2</SUB>SO<SUB>4</SUB> and KCl electrolyte solutions, respectively. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3nj01558k'> </P>
Ramadoss, Ananthakumar,Yoon, Ki-Yong,Kwak, Myung-Jun,Kim, Sun-I.,Ryu, Seung-Tak,Jang, Ji-Hyun Elsevier 2017 Journal of Power Sources Vol.337 No.-
<P><B>Abstract</B></P> <P>Realization of a highly flexible, lightweight, and high performance flexible supercapacitor was achieved using three-dimensional graphene on flexible graphite-paper. A simple and fast self-assembly approach was utilized for the uniform deposition of chemical vapor deposition (CVD)-grown high quality 3D-graphene powders on a flexible graphite-paper substrate. The fabricated paper-based symmetric supercapacitor exhibited a maximum capacitance of 260 F g<SUP>−1</SUP> (15.6 mF cm<SUP>−2</SUP>) in a three electrode system, 80 F g<SUP>−1</SUP> (11.1 mF cm<SUP>−2</SUP>) in a full cell, high capacitance retention and a high energy density of 8.8 Wh kg<SUP>−1</SUP> (1.24 μWh cm<SUP>−2</SUP>) at a power density of 178.5 W kg<SUP>−1</SUP> (24.5 μW cm<SUP>−2</SUP>). The flexible supercapacitor maintained its supercapacitor performance well, even under bent, rolled, or twisted conditions, signifying the excellent flexibility of the fabricated device. Our straightforward approach to the fabrication of highly flexible and lightweight supercapacitors offers new design opportunities for flexible/wearable electronics and miniaturized device applications that require energy storage units that meet the demands of the multifarious applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A fully flexible supercapacitor based on 3D-graphene/graphite-paper was fabricated. </LI> <LI> The 3D-porous architecture provided space for easy migration of electrolyte ions. </LI> <LI> Our device exhibited excellent electrochemical performance and flexibility. </LI> <LI> The present approach is simple, fast, scalable, and highly efficient. </LI> </UL> </P>
Kim, Taehyun,Ramadoss, Ananthakumar,Saravanakumar, Balasubramaniam,Veerasubramani, Ganesh Kumar,Kim, Sang Jae Elsevier 2016 APPLIED SURFACE SCIENCE - Vol.370 No.-
<P><B>Abstract</B></P> <P>In the present work, NiCo<SUB>2</SUB>O<SUB>4</SUB> nanoplates were prepared by a facile, low temperature, hydrothermal method, followed by thermal annealing and used supercapacitor applications. The physico-chemical characterization of as-prepared materials were investigated by means of X-ray diffraction (XRD), Fourier transform infra-red spectroscopy (FT-IR) and field emission scanning electron microscopy (FE-SEM). The electrochemical measurements demonstrate that the NiCo<SUB>2</SUB>O<SUB>4</SUB> nanoplates electrode (NC-5) exhibits a high specific capacitance of 332Fg<SUP>−1</SUP> at a scan rate of 5mVs<SUP>−1</SUP> and also retained about 86% of the initial specific capacitance value even after 2000 cycles at a current density of 2.5Ag<SUP>−1</SUP>. These results suggest that the fabricated electrode material has huge potential as a novel electrode material for electrochemical capacitors.</P> <P><B>Highlights</B></P> <P> <UL> <LI> NiCo<SUB>2</SUB>O<SUB>4</SUB> nanoplates were synthesized through a facile approach. </LI> <LI> The NiCo<SUB>2</SUB>O<SUB>4</SUB> nanoplates electrode material exhibit a specific capacitance of 332Fg<SUP>−1</SUP> at 5mVs<SUP>−1</SUP>. </LI> <LI> The fabricated NiCo<SUB>2</SUB>O<SUB>4</SUB> electrode reveals 86% retention of initial capacitance after 2000 cycles. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Kang, Kyeong-Nam,Kim, Ik-Hee,Ramadoss, Ananthakumar,Kim, Sun-I,Yoon, Jong-Chul,Jang, Ji-Hyun The Royal Society of Chemistry 2018 Physical chemistry chemical physics Vol.20 No.2
<P>An ultrathin nickel hydroxide layer electrodeposited on a carbon-coated three-dimensional porous copper structure (3D-C/Cu) is suggested as an additive and binder-free conductive electrode with short electron path distances, large electrochemical active sites, and improved structural stability, for high performance supercapacitors. The 3D-porous copper structure (3D-Cu) provides high electrical conductivity and facilitates electron transport between the Ni(OH)2 active materials and the current collector of the Ni-plate. A carbon coating was applied to the 3D-Cu to prevent the oxidation of Cu, without degrading the electron transport behavior of the 3D-Cu. The 3D-Ni(OH)2/C/Cu exhibited a high specific capacitance of 1860 F g<SUP>−1</SUP> at 1 A g<SUP>−1</SUP>, and good cycling performance, with an 86.5% capacitance retention after 10 000 cycles. When tested in a two-electrode system, an asymmetric supercapacitor exhibited an energy density of 147.9 W h kg<SUP>−1</SUP> and a power density of 37.0 kW kg<SUP>−1</SUP>. These results open a new area of ultrahigh-performance supercapacitors, supported by 3D-Cu electrodes.</P>
B. Balamuralitharan,Suresh Kannan Balasingam,S. N. Karthick,Ananthakumar Ramadoss,Manab Kundu,박진수,조인호,프라바카르,전용석,김희제 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.71 No.-
Iron pyrite (FeS2) is an interesting mineral in the transition metal dichalcogenide group due to its highabundance in the earth’s crust which can be used for various electrochemical energy storage applications,such as batteries and supercapacitors; however, it suffers from low rate capability and poor cycleperformance, which hampers its use from large-scale commercial applications. In the present study, irondisulfide microspheres anchored onto a reduced graphene oxide matrix (rGO-FeS2 hybrid) were grownusing a superficial hydrothermal method. For comparison, rGO-free iron disulfide material wassynthesized under the same hydrothermal conditions, and uniformly distributed FeS2 micro-sizeflowerswere formed. The energy storage capacity of both electroactive materials (FeS2 and rGO-FeS2 hybridmaterial) was tested for supercapacitor applications in a symmetric cell configuration. The pristine FeS2microflower electrode exhibited an areal capacitance of 70.98 mF cm 2 at 5 mV s 1. On the other hand,the rGO-FeS2 hybrid microsphere electrode exhibited an enhanced areal capacitance of 112.41 mF cm 2 atthe same scan rate with an excellent capacitance retention of 90% over 10,000 cycles. The improvedelectrochemical performance of the rGO-FeS2 hybrid material is due mainly to its improved electricalconductivity, high surface area indicating an enhanced electron, and ion transfer mechanism. This studysuggests that the rGO-FeS2 hybrid electrode material has potential applications in energy storage devices.