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( Mahadik Mahadeo Abasaheb ),( Pravin S. Shinde ),이현휘,조민,장점석 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
A simple and effective strategy was used to fundamentally improve the performance of a heterostructuredNi(OH)2/CdS/ZnIn2S4/TiO2 photoanode. TiO2 nanorods grown hydrothermally on fluorine-doped tin oxide (FTO) were annealed at 500°C. The annealing effect minimized the defects in TiO2 grain boundaries and also aids to enhance the interface between the FTO and TiO2 nanorods for efficient electron transport. The stepwise introduction of ZnIn2S4 and CdS on annealed TiO2 improved both the absorption in the visible spectrum range and electron/hole separation in CdS/ZnIn2S4/TiO2. Additionally, the Ni(OH)2 co-catalyst can acts as effective hole trapping sites and improved the stability of the photoelectrode through the timely consumption of the photogenerated charges, particularly the holes.
Mahadik, Mahadeo A.,Shinde, Pravin S.,Cho, Min,Jang, Jum Suk The Royal Society of Chemistry 2015 Journal of Materials Chemistry A Vol.3 No.46
<▼1><P>A novel, three-dimensional, ternary CdS/ZnIn2S4/TiO2 heterojunction has been fabricated <I>via</I> a three-step facile hydrothermal method.</P></▼1><▼2><P>A novel, three-dimensional, ternary CdS/ZnIn2S4/TiO2 heterojunction has been fabricated <I>via</I> a three-step facile hydrothermal method. In this structure, one-dimensional TiO2 nanorods were directly grown on conductive fluorine-doped tin oxide (FTO) substrates. Next, to form a ternary heterojunction of CdS/ZnIn2S4/TiO2, ZnIn2S4 nanosheets were designed on the TiO2 nanorods and sensitized by CdS nanograins. A systematic photoelectrochemical study shows that the photocurrent density of the ternary heterojunction architecture is as high as 1.4 mA cm<SUP>−2</SUP> at a potential of 0.1 V <I>versus</I> Ag/AgCl (under optimized conditions). A more detailed study shows that the photocurrent density is more than two times higher than that of a single CdS/TiO2 heterojunction (0.615 mA cm<SUP>−2</SUP>) and three times higher than that of ZnIn2S4/TiO2 (at 0.1 V <I>vs.</I> Ag/AgCl). This excellent photoelectrochemical performance is ascribed to the way that the band structure of TiO2 nanorods synergistically cascades with ZnIn2S4 and CdS, which allows for the absorption of a wider portion of the solar spectrum and improves the effective separation of the generated electron–hole pairs. Electrochemical impedance spectroscopy (EIS) studies also reveal the significant changes in both the interface resistance and the charge transfer resistance of the CdS/ZnIn2S4/TiO2 heterostructure. This can be attributed to the efficient hierarchical cascading that occurs during the electron–hole transfer from the excited CdS to TiO2 through the enlarged interface of ZnIn2S4 upon visible light illumination.</P></▼2>
Shinde, Pravin S.,Lee, Su Yong,Ryu, Jungho,Choi, Sun Hee,Jang, Jum Suk unknown 2017 Chemical communications Vol. No.
<P>We report internally porous Au-embedded hematite on FTO using CTAB. Incorporation of Au and CTAB synergistically improved the photocurrent of hematite by 63% at 1.23 V-RHE in 1 M NaOH under standard illumination conditions. The performance enhancement is due to the increased donor density and optical properties of internally porous networks and plasmonic absorption of hematite.</P>
Shinde, Pravin S.,Choi, Sun Hee,Kim, Yongsam,Ryu, Jungho,Jang, Jum Suk The Royal Society of Chemistry 2016 Physical Chemistry Chemical Physics Vol.18 No.4
<P>The onset potential is an important parameter that affects the water oxidation performance of photoanodes. Herein, we investigated the behavior of the photocurrent onset potential of hematite (alpha-Fe2O3) photoanodes by incorporating Sn4+ cations via external (surface overlayer) or self (underlying FTO substrate) doping. The alpha-Fe2O3/FTO photoanodes fabricated at both low (550 degrees C) and high (800 degrees C) temperatures were chosen for surface Sn4+ doping (0-10 mM SnCl4). At the lower temperature, Sn4+ doping enriched the conductivity of alpha-Fe2O3/FTO, thereby improving the photocurrent response at higher applied potentials. In addition, the surface incorporation of Sn4+ shifted the onset of the water oxidation reaction in the positive direction. In the case of high temperature-annealed photoanodes, Sn leaching (resulting from FTO deformation) also affected the water oxidation performance of the photoanodes. This was caused by the loss of FTO conductivity as well as by the unfavourable surface properties due to the excessive incorporation of Sn ions (SnOx) into the hematite matrix. The anodic shift of the onset potential in both cases was due to the decreased surface state capacitance, as revealed by electrochemical impedance spectroscopy (EIS). The different annealing conditions, where lattice distortion and deformation-directed Sn diffusion-doping occur, were also found to affect the surface states associated with hematite and its water oxidation onset potential. Crystallographic analyses made by synchrotron XRD further support the results obtained from the EIS study. Sn doping was found to be concurrent with the respective changes in the (104) and (110) planes of hematite, which are associated with the onset potential-driving surface states and the photocurrent-boosting electron mobility, respectively.</P>
Shinde, Pravin S.,Go, Geun Ho,Lee, Won Jae The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.21
<P>Nanocrystalline hematite (α-Fe<SUB>2</SUB>O<SUB>3</SUB>) film was prepared on FTO using pulse reverse electrodeposition with hierarchical nano-petal structures (∼30 to 35 nm) that appear to protrude out from the agglomerated network. Photocurrent density of nano-petal morphology measured at <I>E</I> = 1.23 V <I>vs.</I> RHE in 1 M NaOH under 1 sun illumination was remarkably increased by 180% relative to that of Fe<SUB>2</SUB>O<SUB>3</SUB> film produced by normal electrodeposition.</P> <P>Graphic Abstract</P><P>Nanocrystalline hematite (α-Fe<SUB>2</SUB>O<SUB>3</SUB>) film was prepared on FTO using pulse reverse electrodeposition with hierarchical nano-petal structures (∼30 to 35 nm) that appear to protrude out from the agglomerated network. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2jm31254a'> </P>
Pravin V. Shinde,Bapurao B. Shingate,Murlidhar S. Shingare 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.2
In the present work, catalytic activity of basic alumina in water has been demonstrated for the synthesis of poly functionalized pyridines. This strategy has some remarkable advantages, such as use of heterogeneous catalyst in aqueous media, reusability of catalyst and scalable approach.
Shinde, Pravin S.,Annamalai, Alagappan,Kim, Jae Young,Choi, Sun Hee,Lee, Jae Sung,Jang, Jum Suk American Chemical Society 2015 The Journal of Physical Chemistry Part C Vol.119 No.10
<P>High:quality hematite (alpha-Fe2O3) photoanodes were syritheSized from a sulfate electrolyte bath by the pulse reverse electrodeposition (PRED) method. The influence of PRED parameters (viz, duty cycle, pulse period, and deposition time) was systematically investigated on the structural, optical, morphological, and photo electrochemical properties of the films. The optimized parameters of pulse duty cycle, pulse:period, and the deposition time were 20%, 10 ms, and 45 s, respectively. The granular and compact nanocrystalline morphology of the alpha-Fe2O3 was found to alter according to the process parameters. The alpha-Fe2O3 electrodes (film thickness similar to 200 nm) prepared by annealing at 550 degrees C for 4 h followed by 800 degrees C for 15 min exhibited an optimum photocurrent density of 504 mu A cm(-2) measured at 1.23 V vs RHE in 1 M NaOH electrolyte under 100 mW cm(-2) light illumination.</P>
Shinde, Pravin V.,Shingate, Bapurao B.,Shingare, Murlidhar S. Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.2
In the present work, catalytic activity of basic alumina in water has been demonstrated for the synthesis of poly functionalized pyridines. This strategy has some remarkable advantages, such as use of heterogeneous catalyst in aqueous media, reusability of catalyst and scalable approach.
Shinde, Pravin V.,Shingate, Bapurao B.,Shingare, Murlidhar S. Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.4
In the present work, successful implementation of ultrasound irradiations for the rapid synthesis of 1,5-benzodiazepine derivatives under solvent-free conditions is demonstrated. Use of a novel catalyst i.e. camphor sulphonic acid in combination with ultrasound technique is reported for the first time. Comparative study for the synthesis of 1,5-benzodiazepines using conventional as well as ultrasonication method is discussed.