Chemically deposited nano grain composed MoS₂ thin films for supercapacitor application

Pujari, R.B.,Lokhande, A.C.,Shelke, A.R.,Kim, J.H.,Lokhande, C.D. Academic Press 2017 Journal of Colloid and Interface Science Vol. No.

<P><B>Abstract</B></P> <P>Low temperature soft chemical synthesis approach is employed towards MoS<SUB>2</SUB> thin film preparation on cost effective stainless steel substrate. 3-D semispherical nano-grain composed surface texture of MoS<SUB>2</SUB> film is observed through FE-SEM technique. Electrochemical supercapacitor performance of MoS<SUB>2</SUB> film is tested from cyclic voltammetry (CV) and galvanostatic charge discharge (GCD) techniques in 1M aqueous Na<SUB>2</SUB>SO<SUB>4</SUB> electrolyte. Specific capacitance (C<SUB>s</SUB>) of 180Fg<SUP>−1</SUP> with CV cycling stability of 82% for 1000 cycles is achieved. Equivalent series resistance (R<SUB>s</SUB>) of 1.78Ωcm<SUP>−2</SUP> observed through Nyquist plot shows usefulness of MoS<SUB>2</SUB> thin film for charge conduction in supercapacitor application.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Electrochemical supercapacitor properties of highly porous sponge-like selenium thin films

Patil, A.M.,Lokhande, A.C.,Chodankar, N.R.,Kim, J.H.,Lokhande, C.D. Pergamon Press ; Elsevier Science Ltd 2016 International journal of hydrogen energy Vol.41 No.39

<P>The porous nanostructured material is a prime requirement of energy storage devices, as it contributes maximum surface area for charge storage. In present paper, a simple and cost effective electrodeposition route has been adopted to prepare highly porous sponge-like selenium thin films. The selenium surface displays porous nanostructure with specific surface area of 35.9 m(2) g(-1) and suitable pore size, providing auspicious trails for transportation as well as penetration of electrolyte ions. The structural study confirms the formation of trigonal structure. The electrochemical properties of selenium films are reported. The film exhibits maximum specific capacitance (C-s) of 29.25 g(-1) at 5 mV s(-1) scan rate in 1 M Na2SO4 electrolyte along with electrochemical stability of 91% after 1000 cyclic voltammetry (CV) cycles. This investigation implies that selenium thin films in composite form may be useful for charge storage applications. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.</P>

Interior design engineering of CuS architecture alteration with rise in reaction bath temperature for high performance symmetric flexible solid state supercapacitor

Patil, A.M.,Lokhande, A.C.,Chodankar, N.R.,Shinde, P.A.,Kim, J.H.,Lokhande, C.D. THE KOREAN SOCIETY OF INDUSTRIAL AND ENGINEERING 2017 JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY -S Vol.46 No.-

<P>Present work portrays surface morphology alteration of CuS thin film with increase in reaction bath temperature. The porous nanoflowers like morphology of CuS offers higher electron transfer and shorten ion diffusion pathway, which facilitates transfer of electrolyte ions. Nanoflowers like morphology of CuS electrode exhibits specific capacitance (C-s) of 1818.2 F g(-1) at scan rate of 5 mV s(-1) with electrochemical cycling stability of 92%. The symmetric FSS-SCs-PVA-LiClO4 device demonstrates Cs of 172.5 F g(-1), specific power density of 1750 W kg(-1) and capacity retention of 93% after 2000 CV cycles. More importantly, this device glows the panel of 200 red LEDs. (C) 2016 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.</P>

Towards high performance unique microstructures of Co₉S₈//CoFe₂O₄ for asymmetric supercapacitor

Patil, S.J.,Lokhande, A.C.,Park, J.S.,Kim, J.H.,Kim, Y.B.,Choi, B.C.,Park, S.H.,Jung, S.H.,Lee, D.W. Elsevier 2018 Journal of industrial and engineering chemistry Vol.61 No.-

<P><B>Abstract</B></P> <P>Herein, we have proposed asymmetric supercapacitor device to achieve empirical electrochemical performance based on binder-free Co<SUB>9</SUB>S<SUB>8</SUB> and CoFe<SUB>2</SUB>O<SUB>4</SUB> electrodes. The unique architecture and porous surface of the prepared electrodes were analyzed using electron microscopy and Brunauer–Emmett–Teller technique. Electrochemical properties of Co<SUB>9</SUB>S<SUB>8</SUB> and CoFe<SUB>2</SUB>O<SUB>4</SUB> electrode were employed in a three-electrode cell-configuration that exhibits a capacitance of 817 and 1203Fg<SUP>−1</SUP>, respectively. Co<SUB>9</SUB>S<SUB>8</SUB>//CoFe<SUB>2</SUB>O<SUB>4</SUB> asymmetric supercapacitor reveals a high capacitance of 79.11Fg<SUP>−1</SUP> with 28.88Whkg<SUP>−1</SUP> energy density and superior cyclic stability over 2500 cycles (∼87%). These results suggest that prepared electrodes have a great potential for practical applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Unique-microstructures of C<SUB>o9</SUB>S<SUB>8</SUB> and CoFe<SUB>2</SUB>O<SUB>4</SUB> electrodes were prepared. </LI> <LI> C<SUB>o9</SUB>S<SUB>8</SUB>//CoFe<SUB>2</SUB>O<SUB>4</SUB> supercapacitor exhibits an energy density of 28.88Whkg<SUP>−1</SUP>. </LI> <LI> The assembled Co<SUB>9</SUB>S<SUB>8</SUB>//CoFe<SUB>2</SUB>O<SUB>4</SUB> supercapacitor delivers a superior rate capability. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>The Ragone plot shows the electrochemical performance of the Co<SUB>9</SUB>S<SUB>8</SUB>//CoFe<SUB>2</SUB>O<SUB>4</SUB> asymmetric supercapacitor device, and inset shows the BET surface area plot.</P> <P>[DISPLAY OMISSION]</P>

Controlled repeated chemical growth of ZnO films for dye-sensitized solar cells

Rajaram S. Mane,이원주,C.D. Lokhande,조병원,한성환 한국물리학회 2008 Current Applied Physics Vol.8 No.5

The controlled growth of ZnO nanorods perpendicular to substrate surface i.e. c-axis by a repeated chemical deposition method for efficient dye-sensitized solar cell application is described. X-ray diffraction study shows the wurtzite structure of ZnO with high crystallinity. Intensity and newly evolved peaks of the ZnO are found to be thickness dependent. Dye loving flower-like globular architecture of ZnO is observed after 8 lm thickness. Dye-sensitized solar cell studies show the solar-to-electrical conversion efficiency of 2.21% for 11 lm ZnO electrode when illuminated with 80 mW/cm2.

Fabrication of Fe:CdSe solar rechargeable (semiconductor–septum) storage cells

Pawar, S.M.,Moholkar, A.V.,Rajpure, K.Y.,Kim, J.H.,Lokhande, C.D.,Bhosale, C.H. Elsevier 2009 Current Applied Physics Vol.9 No.5

<P><B>Abstract</B></P><P>The Fe:CdSe thin films have been electrodeposited potentiostatically onto the stainless steel substrates, from non-aqueous bath containing (CH<SUB>3</SUB>COO)<SUB>2</SUB>·Cd·2H<SUB>2</SUB>O, SeO<SUB>2</SUB> and FeCl<SUB>3</SUB>. The solar rechargeable (semiconductor–septum) storage cell is fabricated with the configuration C|1M polysulphide|<I>n</I>-Fe:CdSe|stainless steel||1M FeCl<SUB>3</SUB> or 1M K<SUB>4</SUB>Fe(CN)<SUB>6</SUB>|C. The charging and discharging modes are studied and discussed. The comparison of FeCl<SUB>3</SUB> and K<SUB>4</SUB>Fe(CN)<SUB>6</SUB> based solar rechargeable storage cells, showed that FeCl<SUB>3</SUB> based storage cell is superior than that of K<SUB>4</SUB>Fe(CN)<SUB>6</SUB> based electrolyte because relatively charging time is minimum and discharging time is maximum. Thus it is concluded that the storage cell works not only as a generator but also as the storage of electricity.</P>

Fabrication of Fe:CdSe solar rechargeable (semiconductor–septum) storage cells

S.M. Pawar,A.V. Moholkar,김진혁,K.Y. Rajpure,C.D. Lokhande,C.H. Bhosale 한국물리학회 2009 Current Applied Physics Vol.9 No.5

The Fe:CdSe thin films have been electrodeposited potentiostatically onto the stainless steel substrates, from non-aqueous bath containing (CH3COO)2 Cd 2H2O, SeO2 and FeCl3. The solar rechargeable (semiconductor-septum) storage cell is fabricated with the configuration C|1 M polysulphide|n-Fe:CdSe|stainless steel||1 M FeCl3 or 1 M K4Fe(CN)6|C. The charging and discharging modes are studied and discussed. The comparison of FeCl3 and K4Fe(CN)6 based solar rechargeable storage cells, showed that FeCl3 based storage cell is superior than that of K4Fe(CN)6 based electrolyte because relatively charging time is minimum and discharging time is maximum. Thus it is concluded that the storage cell works not only as a generator but also as the storage of electricity.

Room temperature liquefied petroleum gas sensing using Cu₂SnS₃/CdS heterojunction

Lokhande, A.C.,Yadav, A.A.,Lee, JuYeon,He, Mingrui,Patil, S.J.,Lokhande, V.C.,Lokhande, C.D.,Kim, Jin Hyeok Elsevier 2017 JOURNAL OF ALLOYS AND COMPOUNDS Vol.709 No.-

<P><B>Abstract</B></P> <P>In the present work, for the first time, we report the fabrication of Cu<SUB>2</SUB>SnS<SUB>3</SUB> (CTS)/CdS heterojunction for room temperature (27 °C) liquefied petroleum gas (LPG) sensing. The heterojunction is formed between sputter deposited CTS thin films and chemically bath deposited CdS thin films. The structural, morphological and optical properties of the thin films are evaluated using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and UV–visible spectroscopy techniques, respectively. The fabricated heterojunction quality is evaluated from the forward biased current-voltage (I-V) study and the influence of annealing treatment of p-CTS thin film on LPG sensing properties of the heterojunction has been investigated. The CTS/CdS heterojunction exhibits maximum LPG response of 56% at room temperature under exposure of 780 ppm LPG concentration with 31s and 56s response and recovery time, respectively. The device retained 95% gas sensing stability after time period of 60 days suggesting that the fabricated CTS/CdS heterojunction is reliable and promising for LPG sensing. The factors affecting LPG sensing performance and plausible gas sensing mechanism are discussed in this study.</P> <P><B>Highlights</B></P> <P> <UL> <LI> CTS/CdS heterojunction based LPG sensor. </LI> <LI> 56% LPG sensing response upon exposure of 780 ppm LPG concentration. </LI> <LI> 95% gas sensing stability of the junction after time period of 60 days. </LI> <LI> LPG gas sensing mechanism. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Binder-free novel Cu₄SnS₄ electrode for high-performance supercapacitors

Lokhande, A.C.,Patil, Amar,Shelke, A.,Babar, P.T.,Gang, M.G.,Lokhande, V.C.,Dhawale, Dattatray S.,Lokhande, C.D.,Kim, Jin Hyeok Elsevier 2018 ELECTROCHIMICA ACTA Vol.284 No.-

<P><B>Abstract</B></P> <P>In this work, for the first time, we report the direct coating of ternary chalcogenide-based nanostructured Cu<SUB>4</SUB>SnS<SUB>4</SUB> (CTS) thin film electrodes for the energy storage application. The phase purity, composition, microstructure, optical and electrical properties of the synthesized electrode are validated through comprehensive characterization techniques. In the supercapacitive application, the CTS electrode delivers an excellent performance with the maximum specific capacitance of 704 F/g, an energy density of 27.77 Wh/kg and a power density of 7.14 kW/kg in 1 M NaOH electrolyte solution. The intrinsic electrode properties such as the electronic conductivity, crystal structure and film hydrophilicity are found to be influential parameters for the obtained high performance and are studied in detail. Furthermore, the solid-state supercapacitive device fabricated using CTS electrodes and polymer gel electrolyte (PVA/NaOH) in a symmetric configuration, demonstrated the highest specific capacitance of 34.9 F/g with an energy density of 2.4 Wh/kg, a power density of 0.291 kW/kg and more than 89.9% capacitive retention. The presented work reports a simple, cost-effective, scalable and replicable approach for electrode application in supercapacitor industry.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Specific capacitance of 704 F/g, an energy density of 27.77 Wh/kg and a power density of 7.14 kW/kg. </LI> <LI> The intrinsic electrode properties, such as the electronic conductivity, crystal structure and hydrophilicity are found to be influential parameters. </LI> <LI> Symmetric device: specific capacitance of 34.9 F/g, an energy density of 2.4 Wh/kg, a power density of 0.291 kW/kg with 89.9% capacitive retention for 1000 cycles. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>The obtained porous microstructure of the CTS thin film electrode using SILAR method and its electrochemical characterization in solid-state symmetric configuration. The CV and GCD curves are accomplished in the potential window range of 0–1.2 V. The device exhibited 89.9% stability retention after 1000 CV cycles.</P> <P>[DISPLAY OMISSION]</P>

The versatility of copper tin sulfide

Lokhande, A. C.,Babar, P. T.,Karade, V. C.,Gang, M. G.,Lokhande, V. C.,Lokhande, C. D.,Kim, Jin Hyeok The Royal Society of Chemistry 2019 Journal of materials chemistry. A, Materials for e Vol.7 No.29

<P>In recent years, copper tin sulfide (CTS) chalcogenide compounds have witnessed applicability in various fields, rendering them as a formidable candidate for various applications. The intrinsic tunable properties accompanied by low cost, easy processing methods and eco-friendly character of CTS compounds collectively contribute to new avenues in industrial applications. In the past decade, chalcogenide CTS compounds have been extensively studied for thin film solar cell (TFSC) applications. However, with the consistent developments in scientific technology, various other applications related to optical, electrochemical, biological, functional coating and gas sensing technology have emerged. It is of vital importance to understand the driving mechanism of these applications for designing a new course for future research. Hence, in this review, the current status of various applications of CTS compounds is discussed. The key factors influencing the multifunctionality such as material properties, synthesis methods, and the doping strategy have been scrutinized. A comprehensive critical assessment of every application with ongoing developments, functional device fabrication, working mechanisms, associated issues/solutions and its potential future is made. The aim of the article is not only to overview the multiple existing applications of CTS compounds but also to develop a meritorious platform for further development in generating state of the art applications.</P>