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( Bulakhe Ravindra Nathuji ),인인식 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
The present work describes the deposition of nickel sulfide (NiS<sub>2</sub>) nanoparticles on to three dimensional (3D) nickel foam using inexpensive chemical method. The formation of NiS<sub>2</sub> is confirmed by using XRD analysis. The SEM analysis revealed a particle type morphology with average size of 50 nm. The NiS<sub>2</sub> showed a maximum specific capacitance of 1153 F g<sup>-1</sup> at a scan rate of 5 mV s<sup>-1</sup>. The NiS<sub>2</sub> materials shows the excellent conductivity, confirmed by EIS study with least ESR value (1.2 Ω). The NiS<sub>2</sub> nanoparticles showed a maximum energy density of 38.40 Wh kg<sup>-1</sup> and a maximum power density of 1340 W kg<sup>-1</sup>, respectively. The investigated nanoparticle showed an excellent cycling stability of 91 % after 5000 cycles. The above result conclude that the NiS<sub>2</sub> is one of best candidate in the near future for energy storage technology. ** 2019년 한국교통대학교 지원을 받아 수행하였음.
BULAKHE RAVINDRA NATHUJI,Van Quang Nguyen,Dirk Tuma,이용락,Haitao Zhang,Suojiang Zhang,심재진 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.66 No.-
Present study investigated decoration of Cu(OH)2 with different morphologies by copper precursors, on 3D nickel foam. The Cu(OH)2-A (nano flower)electrode showed an excellent capacitance of 1332 F g−1 at current density of 2 A g−1 compared to the Cu(OH)2-C (nano ribbon, 1100 F g−1) and Cu(OH)2-S (nano long leaf, 1013 F g−1) electrodes. Asymmetric supercapacitor (ASC) was fabricated, and showed maximum capacitance of 165 F g−1 at current density of 2 A g−1with high energy density of 66.7 Wh kg−1 and power density of 5698 W kg−1 with excellent stability of 80% after 10,000 cycles.
Ravindra N. Bulakhe,Akram Alfantazi,이용록,이문용,심재진 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.101 No.-
The present work describes the deposition of coppersulfide (Cu2S) nanoflakes onto reduced grapheneoxide (rGO) on three dimensional (3D) nickel foam byinexpensive chemical methods. The nanohybridstructure exhibitedexcellent surface area (41.67 m2 g 1) with a porous structure (pore size 22.8 nm) andgood electrical conductivity with a maximum specific capacitance of 1264 F g 1 at a scan rate of 5 mV s 1. The Cu2S@rGOcomposite exhibits a significantlyhigher specific capacitance. The nanohybrid structureshowed outstandingcycling stability of 94 % after 10000cycles. The asymmetric supercapacitor (ASC)device, Cu2S@rGO//rGO exhibited a maximumspecific capacitance of 135 F g 1 withhighenergy andpower densities of 50 Wh kg 1, and 7000 W kg 1, respectively.
( Bulakhe Ravindra Nathuji ),권빈희,( Pabithra Paul ),박성민,인인식 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
The present study includes the synthesis of Nickel hydroxide [Ni(OH)<sub>2</sub>] nanowalls on to 3D conducting Ni foam using successive ionic layer adsorption and reaction (SILAR) method. Thereafter, the formation of polycrystalline nickel hydroxide is confirmed by using XRD analysis. The FE-SEM analysis showed the uniform decoration of Ni(OH)<sub>2</sub> at lower magnification and at higher magnification clearly seen the highly porous nanowalls of thickness of 10 nm, respectively. The high porosity and surface area of Ni(OH)<sub>2</sub> nanowalls exhibits typical pseudocapacitive behavior and high specific capacitance of 1054 F g<sup>-1</sup> at a scan rate of 5 mV s<sup>-1</sup>. The Ni(OH)<sub>2</sub> showed the good conductivity, investigated by EIS techniques estimate the ESR value of 1.8 Ω. The Ni(OH)<sub>2</sub> electrode achieve an excellent energy density of 40 Wh kg<sup>-1</sup> with a power density of 3000 W kg<sup>-1</sup>. The Ni(OH)<sub>2</sub> showed an excellent cycling stability of 89 % after 10000 cycles. ** 2019년 한국교통대 지원을 받아 수행하였음.
Bulakhe, Ravindra N.,Nguyen, Van Quang,Tuma, Dirk,Lee, Yong Rok,Zhang, Haitao,Zhang, Suojiang,Shim, Jae-Jin THE KOREAN SOCIETY OF INDUSTRIAL AND ENGINEERING 2018 JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY -S Vol.66 No.-
<P><B>Abstract</B></P> <P>Present study investigated decoration of Cu(OH)<SUB>2</SUB> with different morphologies by copper precursors, on 3D nickel foam. The Cu(OH)<SUB>2</SUB>-A (nano flower)electrode showed an excellent capacitance of 1332Fg<SUP>−1</SUP> at current density of 2Ag<SUP>−1</SUP> compared to the Cu(OH)<SUB>2</SUB>-C (nano ribbon, 1100Fg<SUP>−1</SUP>) and Cu(OH)<SUB>2</SUB>-S (nano long leaf, 1013Fg<SUP>−1</SUP>) electrodes. Asymmetric supercapacitor (ASC) was fabricated, and showed maximum capacitance of 165Fg<SUP>−1</SUP> at current density of 2Ag<SUP>−1</SUP>with high energy density of 66.7Whkg<SUP>−1</SUP> and power density of 5698Wkg<SUP>−1</SUP> with excellent stability of 80% after 10,000 cycles.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Chemical Synthesis of PEDOT@rGO for Supercapacitor Applications
( Pabithra Paul ),( Bulakhe Ravindra Nathuji ),권빈희,박성민,인인식 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Using of graphene composites as electrode materials for energy storage devices are rapidly increasing in this decade. In this study, we demonstrate the high performance supercapacitive properties of chemically prepared PEDOT@rGO nanohybrid structures using aqueous electrolytes. Physico-chemical characterizations such as XRD analysis, and FTIR spectroscopy reveals the formation of PEDOT@rGO with good stoichiometry. The CV and EIS analyses revealed the presence of ideal capacitive properties of the PEDOT@rGO electrode. The PEDOT@rGO electrode possesses a specific capacitance of about 289 F g<sup>-1</sup> obtained from charge-discharge analysis using a current density of 0.5 mA cm<sup>-2</sup> using a three-electrode configuration. The experimental results elucidate the potential use of PEDOT@rGO nanohybrid structures as an electrode material for high performance supercapacitor devices. ** 2019년 한국교통대학교 지원을 받아 수행하였음.
Bhalerao, Anuradha B.,Wagh, Bhiwa G.,Bulakhe, Ravindra N.,Deshmukh, Prashant R.,Shim, Jae-Jin,Lokhande, Chandrakant D. Elsevier Sequoia 2017 Journal of photochemistry and photobiology Chemist Vol. No.
<P><B>Abstract</B></P> <P>Electrosynthesized cadmium indium selenide (CdIn<SUB>2</SUB>Se<SUB>4</SUB>) thin films were (photo) electrochemically analyzed by current–voltage characteristics, photoresponse, speed response, electrochemical impedance study, and capacitance–voltage characteristics. The improved photoconversion efficiency of electrosynthesized CdIn<SUB>2</SUB>Se<SUB>4</SUB> thin film-based photoelectrochemical cell explained with the help of theoretical modeling of energy band diagram and equivalent circuit model of the impedance spectra of the photoelectrochemical cell.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Obtained highest efficiency for the electrodeposited CdIn<SUB>2</SUB>Se<SUB>4</SUB> photoanode in PEC cell. </LI> <LI> Analysis of photoanode performance using electrochemical impedance spectroscopy. </LI> <LI> Theoretical modeling of energy band diagram to analyze performance of PEC cell. </LI> </UL> </P>
Nandi, Dip K.,Sahoo, Sumanta,Sinha, Soumyadeep,Yeo, Seungmin,Kim, Hyungjun,Bulakhe, Ravindra N.,Heo, Jaeyeong,Shim, Jae-Jin,Kim, Soo-Hyun American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.46
<P>This article takes an effort to establish the potential of atomic layer deposition (ALD) technique toward the field of supercapacitors by preparing molybdenum disulfide (MoS2) as its electrode. 'While molybdenum hexacarbonyl [Mo(CO)(6)] serves as a novel precursor toward the low temperature 'synthesis of ALD-grown MoS2, H2S plasma helps to deposit its polycrystalline phase at 200 degrees C. Several ex situ characterizations such as X-ray diffractometry (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and so forth are performed in detail to study the as-grown MoS2 film on a Si/SiO2 substrate. While stoichiometric MoS2 with very negligible amount of C and O impurities was evident from XPS, the XRD and high-resolution transmission electron microscopy analyses confirmed the (002)-oriented polycrystalline h-MoS2 phase of the as-grown film. A comparative study of ALD-grown MoS2 as a supercapacitor electrode on 2-dimensional stainless steel and on 3-dimensional (3D) Ni-foam substrates clearly reflects the advantage and the potential of ALD for growing a uniform and conformal electrode material on a 3D-scaffold layer. Cyclic voltammetry measurements showed both double-layer capacitance and capacitance contributed by the faradic reaction at the MoS2 electrode surface. The optimum number of ALD cycles was also found out for achieving maximum capacitance for such a MoS2@3D-Ni-foam electrode. A record high areal capacitance of 3400 mF/cm(2) was achieved for MoS2@3D-Ni-foam grown by 400 ALD cycles at a current density of 3 mA/cm(2). Moreover, the ALD-grown MoS2@3D-Ni-foam composite also retains high areal capacitance, even up to a high current density of 50 mA/cm(2). Finally, this directly grown MoS2 electrode on 3D-Ni-foam by ALD shows high cyclic stability (>80%) over 4500 charge discharge cycles which must invoke the research community to further explore the potential of ALD for such applications.</P>