Photoelectrochemical cells by design: 3D nanoporous CdO-CdSe architectures on ITO

Shinde, D.,Lim, I.,Lee, J. K.,Sung, M.,Mane, R.,Han, S. H. Royal Society of Chemistry 2013 Journal of Materials Chemistry A Vol.1 No.35

Electrocatalytic hydrogen evolution using graphitic carbon nitride coupled with nanoporous graphene co-doped by S and Se

Shinde, S. S.,Sami, Abdul,Lee, Jung-Ho The Royal Society of Chemistry 2015 Journal of Materials Chemistry A Vol.3 No.24

<P>Electrocatalytic hydrogen evolution using non-precious metals or metal-free catalysts is critically necessary because platinum-based electrocatalysts are greatly limited in scalable commercialization of hydrogen generation due to their high cost. Here, we report the facile synthesis of metal-free hybrid catalysts, in which graphitic carbon nitride (g-C3N4) is coupled with nanoporous graphene doped by S and Se. The S and Se co-doped hybrid catalyst (g-C3N4@S-Se-pGr) reveals superior electrocatalytic performances, including an exchange current density of 6.27 × 10<SUP>−6</SUP>A cm<SUP>−2</SUP>, an on-set potential of 0.092 V, a Tafel slope of 86 mV dec<SUP>−1</SUP>, an adsorption free energy of −0.13 eV, and long-term stability comparable to those of commercial Pt/C catalysts. Volcano plots showing the hydrogen evolution activity<I>versus</I>adsorption free energy are also compatible with those of the conventional metal catalysts. Our strategy has the potential to allow a new paradigm for the development of high-performance metal-free electrocatalysts for energy conversion devices.</P>

Morphological enhancement to CuO nanostructures by electron beam irradiation for biocompatibility and electrochemical performance

Shinde, S.K.,Kim, D.-Y.,Ghodake, G.S.,Maile, N.C.,Kadam, A.A.,Lee, Dae Sung,Rath, M.C.,Fulari, V.J. Elsevier 2018 Ultrasonics sonochemistry Vol.40 No.1

<P><B>Abstract</B></P> <P>This paper reports the effect of electron beam irradiation on CuO thin films synthesized by the successive ionic layer adsorption and reaction (SILAR) method on copper foil for supercapacitor and biocompatibility application. Pristine and irradiated samples were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, and electrochemical study. Pristine and irradiated CuO films were pure monoclinic phase, with uniform nanostructures over the whole copper foil. After irradiation, CuO samples had formed innovative nanostructures. Biocompatibility of pristine and irradiated CuO samples suggest that CuO sample is non-toxic and ecofriendly. The specific capacitance of pristine and irradiated CuO strongly depends on surface morphology, and CuO electrodes after irradiation showed superior performance than pristine CuO. The highest specific capacitance of the 20kGy irradiated CuO nanoflowers exceeded 511Fg<SUP>−1</SUP> at 10mVs<SUP>−1</SUP> in 1M KOH electrolyte. Irradiated CuO samples also showed lower ESR, and were superior to other report electrical energy storage materials.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Novel route for the synthesis of pure CuO thin films. </LI> <LI> Different nanostructure of pure CuO and irradiated CuO electrode. </LI> <LI> 20kGy irradiated CuO electrode offer high surface area. </LI> <LI> 20kGy irradiated CuO electrode shows excellent supercapacitive properties. </LI> </UL> </P>

Ultrasound-assisted synthesis of diversely functionalized tetrahydro-1H-Indole-4(5H)-one using Brønsted base silica sodium carbonate (SSC) as a catalyst under solvent-free conditions

Shinde, Vijay Vilas,Lee, Seung Min,Oh, Jeong Su,Lim, Kwon Taek,Jeong, Yeon Tae Informa UK (TaylorFrancis) 2016 Synthetic communications Vol.46 No.13

<P>An ultrasound-promoted, environmentally benign, efficient procedure has been developed for the synthesis of biologically active tetrahydro-1H-indol-4(5H)-one using heterogeneous BrOnsted base silica sodium carbonate (SSC) as a catalyst under solvent-free conditions. In comparison to the conventional methods, this efficient green protocol provides remarkable advantages such as good to excellent yields, shorter reaction time, low cost, and easy workup procedure and bypasses the use of hazardous transition-metal catalysts and organic solvents. [GRAPHICS] .</P>

Sonochemical FeF₃ catalyzed three-component synthesis of densely functionalized tetrahydroindazolo[3,2-b]quinazoline under solvent-free conditions

Shinde, V.V.,Jeong, Y.T. Pergamon Press ; Elsevier Science Ltd 2016 Tetrahedron letters: the international organ for t Vol.57 No.33

A green and efficient procedure has been developed for the synthesis of densely functionalized tetrahydroindazolo[3,2-b]quinazoline catalyzed by iron fluoride under sonication in solvent-free condition. In comparison to the conventional methods, this efficient green protocol provides remarkable advantages such as good to excellent yields, shorter reaction time, low cost, easy work-up procedure, and bypass for use of solvent and column chromatography. One of the important and interesting advantages of this methodology compared to previous method is that acyclic 1,3-dicarbonyl also gives the desired product which was not possible using the previously reported methodologies.

Scalable 3-D Carbon Nitride Sponge as an Efficient Metal-Free Bifunctional Oxygen Electrocatalyst for Rechargeable Zn–Air Batteries

Shinde, Sambhaji S.,Lee, Chi-Ho,Sami, Abdul,Kim, Dong-Hyung,Lee, Sang-Uck,Lee, Jung-Ho American Chemical Society 2017 ACS NANO Vol.11 No.1

<P>Rational design of efficient and durable bifunctional oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) electrocatalysts is critical for rechargeable metal–air batteries. Here, we developed a facile strategy for fabricating three-dimensional phosphorus and sulfur codoped carbon nitride sponges sandwiched with carbon nanocrystals (P,S-CNS). These materials exhibited high surface area and superior ORR and OER bifunctional catalytic activities than those of Pt/C and RuO<SUB>2</SUB>, respectively, concerning its limiting current density and onset potential. Further, we tested the suitability and durability of P,S-CNS as the oxygen cathode for primary and rechargeable Zn–air batteries. The resulting primary Zn–air battery exhibited a high open-circuit voltage of 1.51 V, a high discharge peak power density of 198 mW cm<SUP>–2</SUP>, a specific capacity of 830 mA h g<SUP>–1</SUP>, and better durability for 210 h after mechanical recharging. An extraordinary small charge–discharge voltage polarization (∼0.80 V at 25 mA cm<SUP>–2</SUP>), superior reversibility, and stability exceeding prolonged charge–discharge cycles have been attained in rechargeable Zn–air batteries with a three-electrode system. The origin of the electrocatalytic activity of P,S-CNS was elucidated by density functional theory analysis for both oxygen reactions. This work stimulates an innovative prospect for the enrichment of rechargeable Zn–air battery viable for commercial applications such as armamentaria, smart electronics, and electric vehicles.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2017/ancac3.2017.11.issue-1/acsnano.6b05914/production/images/medium/nn-2016-05914q_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn6b05914'>ACS Electronic Supporting Info</A></P>

PRED treatment mediated stable and efficient water oxidation performance of the Fe2O3 nano-coral structure

Shinde, P.,Lee, H.,Lee, S.,Lee, Y.,Jang, J. Royal Society of Chemistry 2015 Nanoscale Vol.7 No.36

Control of rhGH Release Profile from PEG–PAF Thermogel

Shinde, Usha Pramod,Moon, Hyo Jung,Ko, Du Young,Jung, Bo Kyong,Jeong, Byeongmoon American Chemical Society 2015 Biomacromolecules Vol.16 No.5

<P>Poly(ethylene glycol)-poly(<SMALL>l</SMALL>-alanine-<I>co</I>-<SMALL>l</SMALL>-phenyl alanine) diblock copolymers (PEG–PAF) of 2000–990 Da (P2K) and 5000–2530 Da (P5K) with the different molecular weights of PEGs, but having a similar molecular weight ratio of hydrophobic block to hydrophilic block were synthesized to compare their solution behavior and corresponding protein drug release profiles from their in situ formed thermogels. The PEG–PAF aqueous solutions underwent heat-induced sol-to-gel transition in a concentration range of 18.0–24.0 wt % and 8.0–12.0 wt % for P2K and P5K, respectively. P5K formed bigger micelles than P2K, of a broad distribution, whereas the PAF blocks of P5K developed richer in α-helix than those of P2K in the core of the micelles. As the temperature increased, the micelles underwent dehydration of the PEG, which led to the aggregation of micelles, while the secondary structure of PAF was slightly affected during the sol-to-gel transition. The P5K exhibited higher tendency to aggregate and formed a tighter gel than P2K. Upon injection into the subcutaneous layer of rats, both polymer aqueous solutions formed a biocompatible gel with typical mild inflammatory tissue responses. Recombinant human growth hormone (rhGH) maintained its stability without forming any aggregates in both sol (4 °C) and gel (37 °C) states of the PEG–PAFs. Even though P2K and P5K have a similar molecular weight ratio of hydrophobic block to hydrophilic block, the P5K system exhibited a reduced initial burst release, improved bioavailability, and prolonged therapeutic duration of the rhGH, compared to the P2K system. The current research suggests that a drug release profile is a complex function of self-assembling carriers and incorporated drugs, and thus, a promising protein delivery system could be designed by adjusting the molecular parameters of a thermogel.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/bomaf6/2015/bomaf6.2015.16.issue-5/acs.biomac.5b00325/production/images/medium/bm-2015-00325x_0012.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/bm5b00325'>ACS Electronic Supporting Info</A></P>

Sulfur mediated graphitic carbon nitride/S-Se-graphene as a metal-free hybrid photocatalyst for pollutant degradation and water splitting

Shinde, S.S.,Sami, A.,Lee, J.H. Pergamon Press ; Elsevier Science Ltd 2016 Carbon Vol.96 No.-

<P>Development of metal-free catalysts is of huge interest for photocatalytic water splitting using solar energy. Here, we report a composite nano-material consisting of sulfur-incorporated graphitic carbon nitride grown on the surface of sulfur/selenium co-doped graphene (CNS:S-Se-Gr) hybrid as a high-performance metal-free photocatalyst for the degradation of methylene blue (MB) and hydrogen evolution (by water splitting) in the presence of sacrificial donors under visible light illumination. The recorded MB degradation efficiency is about 98% in 3.5 h. The achieved highest hydrogen evolution rates for CNS:S-Se-Gr hybrid in sodium sulfite and lactic acid solution are about 1.58 and 2.59 mmol g(-1) h(-1) respectively. This hybrid material exhibits significantly enhanced photocatalytic H-2 evolution activity (9-fold) compared with that of pristine g-C3N4. Also, we proposed a possible mechanism for charge separation and transfer in the CNS:S-Se-Gr catalyst. Additionally, modulation of the electronic band structure has been investigated. These results suggest that the CNS:S-Se-Gr metal-free hybrid has great potential as a promising photocatalyst for the water splitting. (C) 2015 Elsevier Ltd. All rights reserved.</P>

Baking impact of Fe composition on CdSe films for solar cell application

Shinde, S.K.,Dubal, D.P.,Ghodake, G.S.,Lee, D.S.,Lohar, G.M.,Rath, M.C.,Fulari, V.J. North-Holland 2014 Materials letters Vol.132 No.-

Cd<SUB>1-X</SUB>Fe<SUB>X</SUB>Se thin films were electrodeposited onto fluorine doped tin oxide coated conducting glass (FTO) and stainless steel (SS) substrates at various bath compositions with X=0.1 to 0.5 in an aqueous electrolytic bath containing CdSO<SUB>4</SUB>, FeSO<SUB>4</SUB> and SeO<SUB>2</SUB>. The effects of different compositions on physico-chemical properties of Cd1-XFeXSe thin films have been systematically investigated. The X-ray diffraction (XRD) analysis reveals the polycrystalline in nature of Cd<SUB>1-X</SUB>Fe<SUB>X</SUB>S thin films. Field emission scanning electron microscopy (FE-SEM) micrographs shows the variation in the nanostructure with varying compositions. The Cd<SUB>1-X</SUB>Fe<SUB>X</SUB>Se thin films exhibited the water contact angles in hydrophilic range. Optical absorption measurements are used to estimate the band gap value of Cd<SUB>1-X</SUB>Fe<SUB>X</SUB>Se thin films deposited at various bath compositions. The dramatic changes in surface morphology, as a consequence of different composition of Fe in CdSe matrix, significantly alter the conversion efficiency of Cd<SUB>1-X</SUB>Fe<SUB>X</SUB>Se films.