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RISS 인기검색어
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- 저자 : ( Rahul B. Pujari ) (검색결과 4 건)
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Rahul B. Pujari(라훌 B 푸자리),Dong-Weon Lee(이동원) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.6
The highly conductive, open and porous 2-dimensional nanostructures based electrodes are desired for performance improvement of supercapacitor. In this study, cobalt manganese layered double hydroxide/metal sulfide (MnSx/CoySz) electrodes with open and porous nanostructure are directly grown on conductive substrate without any alkali source. The solution based ion exchange and etching mechanisms transform compact and solid microcubes of manganese sulfide into open and porous surface nanostructured electrodes such as nanoplates of MnCo LDH/MnSx and nanosheets of CoMn LDH/CoySz. Both CoMn LDH/MnSx and CoMn LDH/CoySz electrodes demonstrate an excellent electrochemical charge storage properties in 1 M KOH. However, CoMn LDH/CoySz electrode exhibits highest specific capacitance of 940 Fg<SUP>-1</SUP> at 5 mVs<SUP>-1</SUP> scan rate owing to highly thin nanosheets like structure, which provide higher electrochemical active sites and low equivalent series resistance.
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MnCo<sub>2</sub>S<sub>4</sub>/CoS<sub>2</sub> Electrode for Ultrahigh Areal Capacitance
( Rahul B. Pujari ),( C. D. Lokhande ),( Dong-weon Lee ) 한국센서학회 2020 센서학회지 Vol.29 No.4
MnCo<sub>2</sub>S<sub>4</sub>/CoS<sub>2</sub> electrode with highly accessible electroactive sites is prepared using the hydrothermal method. The electrode exhibits an areal capacitance of 0.75 Fcm<sup>-2</sup> at 6 mAcm<sup>-2</sup> in 1 M KOH. The capacitance is further increased to 2.06 Fcm<sup>-2</sup> by adding K<sub>3</sub>Fe(CN)<sub>6</sub> and K4Fe(CN)<sub>6</sub> (a redox couple) to KOH. This increment is associated with the redox-active properties of cobalt and manganese transition metals, as well as the ion pair of [Fe(CN)<sub>6</sub>]<sup>-3</sup>/[Fe(CN)<sub>6</sub>]<sup>-4</sup>. The capacitance retention of the MnCo<sub>2</sub>S<sub>4</sub>/CoS<sub>2</sub> electrode is 87.5% for successive 4000 charge-discharge cycles at 10 mAcm<sup>-2</sup> in a composite electrolyte system of KOH and ferri/ferrocyanide. The capacitance enhancement is supported by the lowest equivalent series resistance (0.62 Ωcm<sup>-2</sup>) of MnCo<sub>2</sub>S<sub>4</sub>/CoS<sub>2</sub> in the presence of redox additive couple compared with the bare KOH electrolyte.
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Nanostructured Ni-Mn double hydroxide for high capacitance supercapacitor application
( Rahul B. Pujari ),( Dong-weon Lee ) 한국센서학회 2021 센서학회지 Vol.30 No.2
Recently, transition-metal-based hydroxide materials have attracted significant attention in various electrochemical applications owing to their low cost, high stability, and versatility in composition and morphology. Among these applications, transition-metal-based hydroxides have exhibited significant potential in supercapacitors owing to their multiple redox states that can considerably enhance the supercapacitance performance. In this study, nanostructured Ni-Mn double hydroxide is directly grown on a conductive substrate using an electrodeposition method. Ni-Mn double hydroxide exhibits excellent electrochemical charge-storage properties in a 1 M KOH electrolyte, such as a specific capacitance of 1364 Fg<sup>-1</sup> at a current density of 1 mAcm<sup>-2</sup> and a capacitance retention of 94% over 3000 charge-discharge cycles at a current density of 10 mAcm<sup>-2</sup>. The present work demonstrates a scalable, time-saving, and cost-effective approach for the preparation of Ni-Mn double hydroxide with potential application in high-charge-storage kinetics, which can also be extended for other transition-metal-based double hydroxides.
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Surface and diffusive capacity controlled electrochemistry in nickel boride/nickel borate
Vinit Kaluram Kanade,Chaitanya Kaluram Kanade,Rahul B. Pujari,Dong-Weon Lee,Girish Sambhaji Gund,김태성 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-
Electrochemical energy storage devices have attracted considerable attention because of their ability tosupply high energy and power in energy management systems. In this work, we synthesized highly electrochemicallyactive nickel boride/nickel borate (NixB/NiBxOy) composite materials using a chemicalcoprecipitation method. The variation of precursor solution’s concentration controlled the chemical, morphological,surface area and structural properties of composite material. The electrochemical measurementsof NixB/NiBxOy material display a high charge storage capacity of 201.5 mAh/g at 5 mV s1scan rate amongst the different concentration. The charge storage capacity, rate capability and cycle stabilityof NixB/NiBxOy materials were effectively controlled by the material composition, structure, size,surface area and porosity feature through the charge kinetics, surface and diffusive capacity contributionand the battery–type charge storage mechanism. These findings provide an important insight to controlelectrochemical properties by optimizing the physical and chemical features of battery–type material.
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