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Vanalakar, S.A.,Mali, S.S.,Jo, E.A.,Kim, J.Y.,Kim, J.H.,Patil, P.S. Elsevier 2014 SOLID STATE SCIENCES Vol.36 No.-
Thin films of cadmium sulfide (CdS) have been wet chemically deposited onto fluorine-doped tin oxide (FTO) coated conducting glass substrates by using non-ionic surfactant; Triton-X 100. An aqueous solution contains cadmium sulphate as a cadmium and thiourea as sulphur precursor. Ammonia used as a complexing agent. The results of measurements of the x-ray diffraction, Raman spectroscopy, optical spectroscopy, energy dispersive spectroscopy, scanning electron microscopy, Brunauer Emmett Teller (BET) surface areas and atomic force microscopy were used for the characterization of the films. These results revealed that the films are polycrystalline, consisting of CdS cubic phase. The films show a direct band gap with energy 2.39 eV. The films show interconnected nanowalls like morphology with well-defined surface area. Finally, the photoelectrochemical (PEC) performance of Triton-X mediated CdS thin film samples were studied. The sample shows photoelectrochemical (PEC) performance with maximum short circuit current density (J<SUB>sc</SUB>) 1.71 mA/cm<SUP>2</SUP> for larger area (1 cm<SUP>2</SUP>) solar cells.
Suryawanshi, M.P.,Shin, S.W.,Ghorpade, U.V.,Gurav, K.V.,Agawane, G.L.,Hong, C.W.,Yun, J.H.,Patil, P.S.,Kim, J.H.,Moholkar, A.V. Association for Applied Solar Energy ; Elsevier Sc 2014 SOLAR ENERGY -PHOENIX ARIZONA THEN NEW YORK- Vol.110 No.-
A cost-effective chemical approach is developed for the synthesis of photoelectrochemically active Cu<SUB>2</SUB>ZnSnS<SUB>4</SUB> (CZTS) thin films. More specifically, CZTS precursor thin films are prepared by the sequential deposition of Cu<SUB>2</SUB>SnS<SUB>3</SUB> and ZnS layers using a successive ionic adsorption and reaction (SILAR) technique. The CZTS precursor thin films are sulfurized at different temperatures ranging from 500 to 575<SUP>o</SUP>C at intervals of 25<SUP>o</SUP>C. The influence of different sulfurization temperatures on the structural, compositional, morphological, and optical properties, as well as on the photoelectrochemical performance is studied. The films sulfurized at 575<SUP>o</SUP>C showed a prominent kesterite phase with a nearly stoichiometric composition, dense microstructure with the desired thickness, and an optical band gap energy of 1.47eV. The photoelectrochemical (PEC) cell fabricated using CZTS thin film sulfurized at 575<SUP>o</SUP>C showed the highest short circuit current density (J<SUB>sc</SUB>) of 8.27mA/cm<SUP>2</SUP> with a power conversion efficiency (η) of 1.06%.
Patil, U.M.,Sohn, J.S.,Kulkarni, S.B.,Park, H.G.,Jung, Y.,Gurav, K.V.,Kim, J.H.,Jun, S.C. North-Holland 2014 Materials letters Vol.119 No.-
Prominence of current work mainly conveys synthesis of α-MnO<SUB>2</SUB> nanofibers on 3D-graphene foam (GF) by solution growth (SG) method and its proficient influence in electrochemical supercapacitors' performance. The α-MnO<SUB>2</SUB> nanofibers are synthesized on graphene surface by using MnSO<SUB>4</SUB> and ammonium persulfate as an oxidant. The results show formation of aggregated bundles (size about 15-30nm) of 1D α-MnO<SUB>2</SUB> nanofibers on the graphene surface. In supercapacitor, the unique nanofibrous morphology of MnO<SUB>2</SUB> on 3D GF electrode exhibits higher specific capacitance (670Fg<SUP>-1</SUP>) than on the conventional current collector (CC) electrode (440Fg<SUP>-1</SUP>).
Patil, B.H.,Jang, K.,Lee, S.,Kim, J.H.,Yoon, C.S.,Kim, J.,Kim, D.H.,Ahn, H. Elsevier Sequoia 2017 JOURNAL OF ALLOYS AND COMPOUNDS Vol.694 No.-
In the present work, a unique core/shell structured TiO<SUB>2</SUB>/polyaniline (PANI) nanocomposite is successfully fabricated by chemically depositing PANI nanorods on a periodically arrayed TiO<SUB>2</SUB> inverse opal (IO) structure for energy storage applications. The morphology, composition, and electrochemical behavior of the TiO<SUB>2</SUB>/PANI core/shell structure are studied and compared with those of the PANI nanorods on stainless steel substrate. Field emission scanning electron microscopy (FE-SEM) and transmission electron spectroscopy (TEM) studies confirm the formation of a PANI nanorod shell structure on the core of the TiO<SUB>2</SUB> surface. A large specific capacity of 196.59 mA h g<SUP>-1</SUP> at a scan rate of 5 mV s<SUP>-1</SUP> is achieved for TiO<SUB>2</SUB>/PANI electrode which is comparable to that of TiO<SUB>2</SUB> (2.83 mA h g<SUP>-1</SUP>) and PANI (95.86 mA h g<SUP>-1</SUP>) electrodes. Such improvement is ascribed to PANI with a high capacity and excellent conductivity, and the TiO<SUB>2</SUB> IO structure with a large surface area and interconnected macropores, allowing efficient PANI nanorod loading, mass transport, and rapid charge transfer. A symmetric energy storage device is fabricated by assembling the two pieces of TiO<SUB>2</SUB>/PANI with a H<SUB>2</SUB>SO<SUB>4</SUB> gel electrolyte. The device shows the high energy density of 20.36 Wh kg<SUP>-1</SUP> at a power density of 500 W kg<SUP>-1</SUP> with good cycling stability (78% for 1000 cycles).
Patil, S.J.,Kim, J.H.,Lee, D.W. Elsevier 2017 Chemical Engineering Journal Vol. No.
<P><B>Abstract</B></P> <P>In this study, Ni<SUB>3</SUB>S<SUB>2</SUB>-nanorod and CoNi<SUB>2</SUB>S<SUB>4</SUB>-microflower structures have been prepared using a simple one-step hydrothermal method. The complete absence of an additive polymeric binder enabled the electrode to obtain structural purity and excellent electrochemical activity. The formation of the nanorod and micro flowers (µflowers) was clearly visualized by the surface microstructural study. Ni<SUB>3</SUB>S<SUB>2</SUB>-nanorod and CoNi<SUB>2</SUB>S<SUB>4</SUB>-µflower electrodes show a significantly higher specific capacitance of 982.9Fg<SUP>−1</SUP> and 2098.95Fg<SUP>−1</SUP>, respectively, with outstanding electrochemical cyclic stability performance. The CoNi<SUB>2</SUB>S<SUB>4</SUB>-µflower electrode can achieve an energy density of 82.98Whkg<SUP>−1</SUP> with a power density of 9.63kWkg<SUP>−1</SUP>. In addition, a 91% capacitive retention remains after 2000 cycles at a scan rate of 100mVs<SUP>−1</SUP>. The designed hybrid asymmetric supercapacitor, based on Ni<SUB>3</SUB>S<SUB>2</SUB>-nanorod//CoNi<SUB>2</SUB>S<SUB>4</SUB>-µflower electrodes, exhibits a specific capacitance of 54.92Fg<SUP>−1</SUP> at a scan rate of 5mVs<SUP>−1</SUP>. The assembled asymmetric supercapacitor has an energy density of 6.6Whkg<SUP>−1</SUP> while delivering a power density of 820Wkg<SUP>−1</SUP>. The capacitive retention of the initial capacitance remains desirable at 89.13% after 5000 CV cycles at a scan rate of 100mVs<SUP>−1</SUP>. The present work manifests a vision for the fabrication of self-assembled, binder-free electrodes for high-performance hybrid supercapacitor application.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The self-assembled unique microstructures were obtained by a hydrothermal method. </LI> <LI> CoNi<SUB>2</SUB>S<SUB>4</SUB>-µflower arrays showed a high specific capacitance of 2098.95Fg<SUP>−1</SUP>. </LI> <LI> Asymmetric supercapacitor designed with Ni<SUB>3</SUB>S<SUB>2</SUB>-nanorod and CoNi<SUB>2</SUB>S<SUB>4</SUB>-µflower arrays. </LI> <LI> Ni<SUB>3</SUB>S<SUB>2</SUB>//CoNi<SUB>2</SUB>S<SUB>4</SUB> delivers energy density of 6.6Whkg<SUP>−1</SUP> at a power of 820Wkg<SUP>−1</SUP>. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Patil, S.S.,Patil, D.R.,Apte, S.K.,Kulkarni, M.V.,Ambekar, J.D.,Park, C.J.,Gosavi, S.W.,Kolekar, S.S.,Kale, B.B. Elsevier 2016 Applied Catalysis B Vol.190 No.-
<P>Ag3PO4 is a good photocatalyst but ubiquitously known for its photocorrosion problem during photocatalytic reaction. Therefore, stabilization of Ag3PO4 with retaining its fundamental properties has immense importance. With this motivation, we designed Ag3PO4 glass nanocomposite to resolve the problem of photocorrosion. Moreover, the effect of size quantization on photocatalytic activity has also been demonstrated by growing the cubic Ag3PO4 nanoparticles with size in the range of 3-9 nm in glass matrix via melt and quenching method. The band gap of Ag3PO4 has been tuned (2.56-2.25 eV) in glass matrix with respect to size. Considering the size tunable band gap of Ag3PO4 glass nanocomposite within visible region, it is demonstrated as a photocatalyst for hydrogen (H-2) production from copious hazardous waste H2S. The utmost H-2 production i.e. 3920.4 mu mol h(-1) g(-1) is obtained using 1 gm of Ag3PO4 glass nanocomposite powder. The apparent quantum yield for H-2 production is calculated to be 5.51% for Ag3PO4 glass nanocomposite. Interestingly, presence of plasmonic Ag was also observed in Ag3PO4 glass nanocomposite which contributes for H-2 production through enhanced light absorption, efficient charge separation and improved stability. Recycling study of sample reveals stable H-2 production efficiency and good stability of the photocatalyst. Surprisingly, catalyst can be reused many times and recovery of catalyst is possible just rinsing with distilled water. All these results demonstrate directly the feasibility of designing a new generation photocatalysts. (C) 2016 Published by Elsevier B.V.</P>
Investigations on Nanocomposites of Silver Nanosticks and Polyaniline for Supercapacitor Application
Patil, Dipali S.,Pawar, S. A.,Mali, S. S.,Hong, C. K.,Kim, J. H.,Patil, P. S.,Shin, J. C. American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.6
<P>Silver nanosticks-polyaniline (AgNS-PANI) thin films are deposited on stainless steel substrates by a dip coating technique. The surface morphology of the films is examined by Field Emission Scanning Electron Microscopy, which revealed the presence of AgNSs on PANI background. There is decrease in the room temperature electrical resistivity observed for the sample AgNS-PANI of the order of 10(2). The highest specific capacitance of 628 Fg(-1) at 5 mVs(-1) and energy density of 76.30 Wh kg(-1) at 1 mA cm(-2) is observed for the AgNS-PANI indicating positive effect of AgNSs. The cyclic life of sample AgNS-PANI is measured and the specific capacitance is found to decline by about 17% after 2000 cycles.</P>
Investigations on silver/polyaniline electrodes for electrochemical supercapacitors
Patil, Dipali S.,Shaikh, J. S.,Pawar, S. A.,Devan, R. S.,Ma, Y. R.,Moholkar, A. V.,Kim, J. H.,Kalubarme, R. S.,Park, C. J.,Patil, P. S. The Royal Society of Chemistry 2012 Physical chemistry chemical physics Vol.14 No.34
<P>Polyaniline (PANI) and silver doped polyaniline (Ag/PANI) thin films were deposited on stainless steel substrates by a dip coating technique. To study the effect of doping concentration of Ag on the specific capacitance of PANI the concentration of Ag was varied from 0.3 to 1.2 weight percent. Fourier transform-infrared and Fourier transform-Raman spectroscopy, and energy dispersion X-ray techniques were used for the phase identification and determination of the doping content in the PANI films, respectively. The surface morphology of the films was examined by Field Emission Scanning Electron Microscopy, which revealed a nanofiber like structure for PANI and nanofibers with bright spots of Ag particles for the Ag/PANI films. There was decrease in the room temperature electrical resistivity of the Ag/PANI films of the order of 10<SUP>2</SUP> with increasing Ag concentration. The supercapacitive behavior of the electrodes was tested in a three electrode system using 1.0 M H<SUB>2</SUB>SO<SUB>4</SUB> electrolyte. The specific capacitance increased from 285 F g<SUP>−1</SUP> (for PANI) to 512 F g<SUP>−1</SUP> for Ag/PANI at 0.9 weight percent doping of Ag, owing to the synergic effect of PANI and silver nanoparticles. This work demonstrates a simple strategy of improving the specific capacitance of polymer electrodes and may also be easily adopted for other dopants.</P> <P>Graphic Abstract</P><P>The presence of Ag nanoparticles on PANI nanofibers provides a least resistance path to electron transportation. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cp41757j'> </P>