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.

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>

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>

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>

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.

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>

Structural and magnetic properties of single-step electrochemically deposited nanocrystalline cobalt ferrite thin films

C.D. Lokhande,Rajaram S. Mane,S.S. Kulkarni,한성환,K.C. Nandi 한국물리학회 2008 Current Applied Physics Vol.8 No.5

In this paper, we study the structural, surface morphological and magnetic properties of single-step electrochemically deposited cobalt ferrite thin films. The prepared films were nanocrystalline with cubic crystal structure. Scanning electron micrograph image showed that the cobalt ferrite thin film was uniformly distributed over the substrate in addition to some random overgrowth of porous particles. The saturation magnetization of 298 emu/c was confirmed when films were used in magnetic studies. In this paper, we study the structural, surface morphological and magnetic properties of single-step electrochemically deposited cobalt ferrite thin films. The prepared films were nanocrystalline with cubic crystal structure. Scanning electron micrograph image showed that the cobalt ferrite thin film was uniformly distributed over the substrate in addition to some random overgrowth of porous particles. The saturation magnetization of 298 emu/c was confirmed when films were used in magnetic studies.

Towards cost effective metal precursor sources for future photovoltaic material synthesis: CTS nanoparticles

Lokhande, A.C.,Gurav, K.V.,Jo, E.,He, M.,Lokhande, C.D.,Kim, J.H. Elsevier Science Publishers 2016 Optical materials Vol.54 No.-

Copper tin sulfide (CTS) is an emerging candidate for solar application due to its favorable band gap and higher optical absorption coefficient. Kuramite-Tetragonal Cu<SUB>3</SUB>SnS<SUB>4</SUB> (CTS) monodisperse nanoparticles are prepared by hot injection technique involving cost effective sulfate metal precursor source. A protocol for controlled crystal structure has been demonstrated by variation of cationic Cu:Sn ratio. The crystal structure, size, phase purity, atomic composition, oxidation state and optical properties of the nanoparticles are confirmed from X-ray diffraction (XRD), transmission electron microscopy (TEM), Raman, energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS) and UV-visible spectroscopy, respectively. Hexagonal shaped particles within the size distribution of 7-9nm with an optimal band gap of 1.28eV are obtained. XPS study shows the Cu<SUP>1+</SUP>, Sn<SUP>4+</SUP> and S<SUP>2-</SUP> oxidation states. The effects of influential factors such as metal precursor ratio, metal precursor source, reaction time, heating rate and solvents have been demonstrated systematically on the synthesis of CTS nanoparticles. The plausible mechanism of the formation of CTS nanoparticles has been proposed. The obtained results provide new insight for applying CTS nanoparticles in photovoltaic applications.

High electrochemical performance asymmetric supercapacitor based on La2O3//Co3O4 electrodes

C.D. Lokhande,A.A. Yadav,A.C. Lokhande,J. H. Kim 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.56 No.-

The Co3O4 and La2O3 electrodes are prepared using chemical bath deposition method. Theelectrochemical properties of Co3O4 and La2O3 electrodes show maximum specific capacitance of415 and 288 F g 1 in potential window of 0.0 to0.6 and0.2 to 0.5 V/SCE, respectively in 1 M KOHelectrolyte at scan rate of 5 mV s 1. The solid state asymmetric supercapacitor device (ASC) is fabricatedusing Co3O4 as an anode and La2O3 as a cathode with PVA–KOH gel as a solid electrolyte and separator. Co3O4//La2O3 asymmetric supercapacitor shows good performance with specific capacitance of 15 F g 1and 92% capacitance retention after 2000 cycles. The energy and power densities are 42.9 Wh kg 1 and108.2 W kg 1, respectively. Two assembled Co3O4//La2O3 ASCs devices in series lights up red LED aftercharging for 45 s.