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Pazhamalai, Parthiban,Krishnamoorthy, Karthikeyan,Sahoo, Surjit,Mariappan, Vimal Kumar,Kim, Sang -Jae Elsevier 2019 Chemical engineering journal Vol.359 No.-
<P><B>Abstract</B></P> <P>Transition binary metal sulfides have fascinated much attention as electrode materials for energy storage applications. Herein, we report the use of binder-free copper tungsten sulfide (CWS) anchored on Ni foam and investigated its electrochemical properties as a negative electrode for supercapacitor application. The mechanism of CWS growth on the surface of Ni foam via hydrothermal process is explained based on recrystallization of metastable precursors (RMP) process and confirmed using laser Raman spectroscopic analysis. The electrochemical analysis using three-electrode configuration reveals that the charge-storage mechanism is due to the Type-B pseudocapacitance (due to intercalation with partial redox) nature of the CWS/Ni electrode with a high specific capacitance (areal capacitance/specific capacity) of 2666.6 F g<SUP>−1</SUP> (888.8 mAh g<SUP>−1</SUP>/1866.6 mF cm<SUP>−2</SUP>) at a constant current of 10 mA. To emphasize the potential use of CWS/Ni electrode in energy storage sector, we fabricated an asymmetric supercapacitor device using CWS/Ni (negative electrode) and graphene (positive electrode) which delivers a device specific capacitance (107.93 F g<SUP>−1</SUP>/226.67 mF cm<SUP>−2</SUP>) with a high energy density (48.57 Wh kg<SUP>−1</SUP>/102 μWh cm<SUP>−2</SUP>), and excellent electrochemical stability for 10,000 charge-discharge cycles. These results confirm that the CWS/Ni electrode can act as an effective energy-storage electrode material for high performance supercapacitors.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Copper tungsten sulfide (CWS) nanostructures anchored on Ni foam via hydrothermal recrystallization process. </LI> <LI> A specific capacitance of 2666.6 F g<SUP>−1</SUP> was obtained for the CWS/Ni electrode. </LI> <LI> An asymmetric device has been fabricated using CWS/Ni and graphene electrode. </LI> <LI> The fabricated CWS/Ni||graphene ASC delivered a high device specific capacitance of 107.93 F g<SUP>−1</SUP>. </LI> <LI> A high energy density of 48.5 Wh kg<SUP>−1</SUP> was obtained for the CWS/Ni||graphene ASC. </LI> </UL> </P>
Pazhamalai, Parthiban,Krishnamoorthy, Karthikeyan,Mariappan, Vimal Kumar,Kim, Sang-Jae THE KOREAN SOCIETY OF INDUSTRIAL AND ENGINEERING 2018 JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY -S Vol.64 No.-
<P><B>Abstract</B></P> <P>Herein, we demonstrated a facile sonochemical preparation of manganese hexacyanoferrate (Mn-HCF) and examined its use as an intercalative-type electrode for Li-ion hybrid capacitors (LHCs). The X-ray diffraction, field-emission scanning electron microscopy, and X-ray photoelectron spectroscopic analyses revealed the formation of Mn-HCF nanocubes. The electrochemical analyses revealed the presence of ion-intercalation pseudocapacitance in the Mn-HCF electrode with a specific capacity of 81.59mAhg<SUP>−1</SUP>. In the view of practical applications, we designed a Mn-HCF∥graphene LHC which delivered a high specific capacitance (79.52Fg<SUP>−1</SUP>) and energy density (44.18Whkg<SUP>−1</SUP>), respectively. Overall, our results highlight the significance of Mn-HCF towards cost-effective energy storage devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Manganese hexacyanoferrate (Mn-HCF) prepared via facile sonochemical method. </LI> <LI> X-ray diffraction, HR-TEM, and XPS analyses revealed the formation of Mn-HCF cubes. </LI> <LI> The Mn-HCF electrode shows ion-intercalation pseudocapacitance with a specific capacity of 81.59mAhg<SUP>−1</SUP>. </LI> <LI> Aqueous Li-ion hybrid capacitor was assembled using Mn-HCF and graphene. </LI> <LI> A high energy density of 44.18Whkg<SUP>−1</SUP> was obtained for the fabricated LHC device. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Pazhamalai, Parthiban,Krishnamoorthy, Karthikeyan,Sahoo, Surjit,Kim, Sang -Jae Elsevier 2018 JOURNAL OF ALLOYS AND COMPOUNDS Vol.765 No.-
<P><B>Abstract</B></P> <P>A high-performance aqueous Li-ion hybrid capacitor (LHC) using sonochemically prepared copper hexacyanoferrate (Cu-HCF) and sodium alginate-derived graphitic carbon (GC) nanoparticles are capable of serving as positive and negative electrodes, respectively, is described in this report. The electrode materials were prepared in a cost-effective manner and characterized using X-ray diffraction (XRD) and Fourier transform-infrared spectroscopy (FT-IR). High-resolution transmission electron microscopy (HR-TEM) and surface area measurements revealed the formation of 30- to 60-nm Cu-HCF and 40- to 60-nm GC particles with specific surface areas of 48 and 802 m<SUP>2</SUP>g<SUP>–1</SUP>, respectively. Electrochemical studies including cyclic voltammetry (CV), galvanostatic charge-discharge (CD) analysis and electrochemical impedance spectroscopy (EIS) using a three-electrode configuration confirmed the presence of intercalative capacitance in the Cu-HCF electrode and double-layer capacitance in the GC electrode. Furthermore, the constructed Cu-HCF‖GC aqueous LHC system operates over a wide voltage window (2.2 V) and delivers a high capacitance (63.64 F g<SUP>−1</SUP>) and high energy density (42.78 Wh kg<SUP>−1</SUP>) with a good rate capability. These key features make the LHC system an ideal candidate for next-generation electrochemical energy storage devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Copper-hexacyanoferrate and graphitic carbon nanoparticles with size <50 nm were prepared. </LI> <LI> Aqueous Li-ion capacitor was assembled using Cu-HCF and graphitic carbon electrodes. </LI> <LI> The fabricated LHC device operates in a wide voltage window of 2.2 V. </LI> <LI> The aqueous LHC device delivered a high specific capacitance of 63.64 F g<SUP>−1</SUP>. </LI> <LI> A high energy density of 42.78 Wh kg<SUP>−1</SUP> was obtained for the Cu-HCF‖GC LHC device. </LI> </UL> </P>
Pazhamalai, P.,Krishnamoorthy, K.,Kim, S.J. Pergamon Press ; Elsevier Science Ltd 2016 International journal of hydrogen energy Vol.41 No.33
<P>In this communication, we demonstrated the use of CuSe2 nanoneedles grown on copper foil as a binder-free electrode for supercapacitors. Studies using X-ray diffraction, laser Raman spectroscopy and field emission scanning electron microscopy confirmed the formation of crystalline CuSe2 nanoneedles on the surface of copper foil. Cyclic voltammetry and electrochemical impedance spectroscopy revealed the pseudocapacitive nature of the CuSe2/Cu electrode. The galvanostatic charge discharge analysis showed that the CuSe2/Cu binder-free electrode delivered a high specific capacitance of about 1037.5 F/g at a constant current density of 0.25 mA/cm(2). (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.</P>
Pazhamalai, Parthiban,Krishnamoorthy, Karthikeyan,Sahoo, Surjit,Mariappan, Vimal Kumar,Kim, Sang-Jae American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.1
<P>Two-dimensional siloxene sheets are an emerging class of materials with an eclectic range of potential applications including electrochemical energy conversion and storage sectors. Here, we demonstrated the dehydrogenation/dehydroxylation of siloxene sheets by thermal annealing at high temperature (HT) and investigated their supercapacitive performances using ionic liquid electrolyte. The X-ray diffraction analysis, spectroscopic (Fourier transform infrared, laser Raman, and X-ray photoelectron spectroscopy) studies, and morphological analysis of HT-siloxene revealed the removal of functional groups at the edges/basal planes of siloxene, and preservation of oxygen-interconnected Si<SUB>6</SUB> rings with sheet-like structures. The HT-siloxene symmetric supercapacitor (SSC) operates over a wide potential window (0-3.0 V), delivers a high specific capacitance (3.45 mF cm<SUP>-2</SUP>), high energy density of about 15.53 mJ cm<SUP>-2</SUP> (almost 2-fold higher than that of the as-prepared siloxene SSC), and low equivalent series resistance (compared to reported silicon-based SSCs) with excellent rate capability and long cycle life over 10 000 cycles.</P> [FIG OMISSION]</BR>
Parthiban Pazhamalai,Karthikeyan Krishnamoorthy,Vimal Kumar Mariappan,김상재 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.64 No.-
Herein, we demonstrated a facile sonochemical preparation of manganese hexacyanoferrate (Mn-HCF) and examined its use as an intercalative-type electrode for Li-ion hybrid capacitors (LHCs). The X-ray diffraction, field-emission scanning electron microscopy, and X-ray photoelectron spectroscopic analyses revealed the formation of Mn-HCF nanocubes. The electrochemical analyses revealed the presence of ion-intercalation pseudocapacitance in the Mn-HCF electrode with a specific capacity of 81.59 mAh g−1. In the view of practical applications, we designed a Mn-HCF∥graphene LHC which delivered a high specific capacitance (79.52 F g−1) and energy density (44.18 Wh kg−1), respectively. Overall, our results highlight the significance of Mn-HCF towards cost-effective energy storage devices.
Parthiban Pazhamalai(파자말라이 파르티반),Karthikeyan Krishnamoorthy(케이 카티케 이얀),Sindhuja Manoharan(마노하란 신드후자),Sang-Jae Kim(김상재) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
Self-charging supercapacitor power cell (SCSPC) is one of the nascent areas of research for the surrogating to renewable energy resources. The prime obstacle in development SCSPC is the utilization of liquid electrolyte hinders the energy conversion efficiency which in turn creates a demand to explore and replace with new solid electrolytes for the SCSPCs. Herein, a new all solid state self-charging supercapacitor power cell (SCSPC) has been fabricated using Nafion as solid polyelectrolyte cum energy harvester and spray coated MoS2 quantum sheets (MoS2-QSs) as energy storage electrodes. The Nafion polyelectrolyte exhibits energy harvesting characteristics under mechanical deformation due to the change in ion concentration gradients between electrodes that leads to the generation of output voltage. The fabricated MoS2-Nafion-MoS2 SCSPC shows the self-charging characteristics upon various levels of compressive forces with a self-charging voltage of 243 mV. The self-charging mechanism of the fabricated MoS2-Nafion-MoS2 SCSPC is explained via piezo-ionic effect. These experimental findings have profound significance in the context of developing a potential all-in-one self-charging system.