BiVO₄/Graphene Photoanode for Enhanced Photoelectrochemical Water Splitting Performance

Mohaseen S. Tamboli,Asiya M. Tamboli,Vasudeva Reddy Minnam Reddy,Bomyung Kim,Chinho Park 한국에너지학회 2021 한국에너지공학회 학술발표회 Vol.2021 No.4

Polyaniline-wrapped MnMoO₄ for Energy Storage Application

Asiya M. Tamboli,Mohaseen S. Tamboli,Bomyung Kim,Chinho Park 한국에너지학회 2021 한국에너지공학회 학술발표회 Vol.2021 No.4

Ageing and vapor chopping effect on the properties of MgO thin films

Tamboli, S.H.,Jatratkar, A.,Yadav, J.B.,Puri, V.,Puri, R.K.,Cho, H.H. Elsevier Sequoia 2014 JOURNAL OF ALLOYS AND COMPOUNDS Vol.588 No.-

Nanoscale magnesium oxide thin films have been prepared on glass substrates by thermal oxidation (in air) of vacuum evaporated magnesium films. The ageing (air exposure) effect for 1, 10, 20 and 30days on the various properties of MgO thin films was studied. The ageing effect on the optoelectronic devices i.e. optical waveguide and plasma display panel's performance was examined by measuring their optical transmission loss and secondary electron emission yield, respectively. Vapor chopping technique was employed for thin film quality improvement followed by ageing inhibition. The firing voltage for fresh vapor chopped (VC) MgO thin films was in 125-150V range, which shifted to 140-178V after 30days, whereas in the non-chopped (NC) films it increased up to 165-210V from 140-160V. After 30days ageing, NC thin film surface morphology changed from polished to dull due to wrapped moisture like layer, whereas VC thin film morphology was unpretentious. The XPS analysis also confirmed the VC MgO thin films superior sustainability against the ageing than NC films.

Synthesis of cerium and nickel doped titanium nanofibers for hydrolysis of sodium borohydride

Tamboli, Ashif H.,Gosavi, S.W.,Terashima, Chiaki,Fujishima, Akira,Pawar, Atul A.,Kim, Hern Elsevier 2018 CHEMOSPHERE - Vol.202 No.-

<P><B>Abstract</B></P> <P>A recyclable titanium nanofibers, doped with cerium and nickel doped was successfully synthesized by using sol-gel and electrospinning method for hydrogen generation from alkali free hydrolysis of NaBH<SUB>4</SUB>. The resultant nanocomposite was characterized to find out the structural and physical-chemical properties by a series of analytical techniques such as FT-IR (Fourier transform infrared spectroscopy), XRD (X-ray diffraction), SEM (scanning electron microscope), EDX (energy-dispersive X-ray spectroscopy),N<SUB>2</SUB> adsorption-desorption and BET (Brunauer–Emmett–Teller), etc. The results revealed that cerium and nickel nanoparticles were homogeneously distributed on the surface of the TiO<SUB>2</SUB> nanofibers due to having similar oxidation state and atomic radium of TiO<SUB>2</SUB>nanofibers with CeO<SUB>2</SUB> and NiO for the effective immobilization of metal ions. The NiO doped catalyst showed superior catalytic performance towards the hydrolysis reaction of NaBH<SUB>4</SUB> at room temperature. These catalysts have ability to produce 305 mL of H<SUB>2</SUB> within the time of 160 min at room temperature. Additionally, reusability test revealed that the catalyst is active even after five runs of hydrolytic reaction, implying the as-prepared NiO doped TiO<SUB>2</SUB> nanofibers could be considered as a potential candidate catalyst for portable hydrogen fuel system such as PEMFC (proton exchange membrane fuel cells).</P> <P><B>Highlights</B></P> <P> <UL> <LI> A recyclable metal doped TiO<SUB>2</SUB> electrospun nanofibers was successfully synthesized. </LI> <LI> Beadles nanofibers and uniform distribution of doped metal facilitate stability to catalyst. </LI> <LI> The metal doped catalyst showed superior activity for hydrolysis of NaBH<SUB>4</SUB>. </LI> <LI> The metal doped TiO<SUB>2</SUB> catalyst could be used repeatedly without significant loss in activity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Highly selective and multifunctional chitosan/ionic liquids catalyst for conversion of CO₂ and methanol to dimethyl carbonates at mild reaction conditions

Tamboli, A.H.,Chaugule, A.A.,Kim, H. Butterworths [etc.] ; Elsevier Science Ltd 2016 Fuel Vol.166 No.-

The direct reaction of CO<SUB>2</SUB> and methanol is the most attractive route for dimethyl carbonates (DMC) synthesis from the point of green chemistry and sustainable development. In this work, a 10wt% chitosan/ionic liquid (IL)-catalyst system having hydroxyl and amine groups as nucleophilic and carbon dioxide absorption sites was synthesized for DMC synthesis. This method provides an example of how an abundant biopolymer can be dissolved in IL for direct use as an electron-rich amino or hydroxyl group source for CO<SUB>2</SUB> capture, which extends the scope of efficient DMC synthesis. The catalyst was characterized by Wide Angle X-ray diffraction (WAXRD) to confirm the structural distortion of crystalline chitosan where resultant active groups will be available for CO<SUB>2</SUB> absorption. The catalyst showed excellent catalytic activity, selectivity and stability under mild conditions: 16.90% methanol conversion and ~98.72% DMC selectivity. The catalytic performance revealed that the as-prepared ''green'' catalyst is very active and reusable for the DMC synthesis.

Mechanistic antimicrobial approach of extracellularly synthesized silver nanoparticles against gram positive and gram negative bacteria

Tamboli, D.P.,Lee, D.S. Elsevier Scientific Pub. Co 2013 Journal of hazardous materials Vol.260 No.-

The development of eco-friendly and reliable processes for the synthesis of nanoparticles has attracted considerable interest in nanotechnology. In this study, an extracellular enzyme system of a newly isolated microorganism, Exiguobacterium sp. KNU1, was used for the reduction of AgNO<SUB>3</SUB> solutions to silver nanoparticles (AgNPs). The extracellularly biosynthesized AgNPs were characterized by UV-vis spectroscopy, Fourier transform infra-red spectroscopy and transmission electron microscopy. The AgNPs were approximately 30nm (range 5-50nm) in size, well-dispersed and spherical. The AgNPs were evaluated for their antimicrobial effects on different gram negative and gram positive bacteria using the minimum inhibitory concentration method. Reasonable antimicrobial activity against Salmonella typhimurium, Pseudomonas aeruginosa, Escherichia coli and Staphylococcus aureus was observed. The morphological changes occurred in all the microorganisms tested. In particular, E. coli exhibited DNA fragmentation after being treated with the AgNPs. Finally, the mechanism for their bactericidal activity was proposed according to the results of scanning electron microscopy and single cell gel electrophoresis.

Post-heating effects on the physical and electrochemical capacitive properties of reduced graphene oxide paper

Tamboli, S.,Kim, B.,Choi, G.,Lee, H.,Lee, D.,Patil, U. M.,Lim, J.,Kulkarni, S. B.,ChanJun, S.,Cho, H. Royal Society of Chemistry 2014 Journal of Materials Chemistry A Vol.2 No.14

We report combined electrochemical double-layer capacitance (EDLC) and pseudocapacitance in reduced graphene oxide (rGO) thick film like paper due to annealing temperature variations. The influence of annealing temperature (from room temperature (RT) to 1000 degrees C) on the structural, morphological, electrical, and electrochemical properties of rGO paper was evaluated. Upon increasing the annealing temperature, shifting of the dominant (002) X-ray diffraction (XRD) peak to a higher degree, volume expansion, and red-shifting of the G band in Raman spectra were observed. High-resolution transmission electron microscopy (HRTEM) images showed a reduction in the interlayer distance in rGO sheets from 0.369 to 0.349 nm as the annealing temperature increased from RT to 1000 degrees C; these results were congruent with the XRD results. According to X-ray photoelectron spectroscopy (XPS), the presence of hydroxyl, carboxyl, and other oxygen-containing groups decreased in samples annealed at higher temperatures. The attached functional groups, the electrical conductivity, and the supercapacitance of rGO papers were found to be mutually interrelated and could be tuned by varying the annealing temperature. The rGO paper annealed at 200 degrees C in a 1 M H2SO4 electrolyte at a scan rate of 50 mV s(-1) exhibited a maximum specific capacitance of 198 F g(-1).

Association between age at first calving, first lactation traits and lifetime productivity in Murrah buffaloes

Tamboli P.,Bharadwaj A.,Chaurasiya A.,Bangar Y. C.,Jerome A. 아세아·태평양축산학회 2022 Animal Bioscience Vol.35 No.8

Objective: This study was conducted to estimate the association of age at first calving (AFC) with first lactation traits as well as lifetime performance traits in Murrah buffaloes. Methods: Data on first lactation and life time performance of Murrah buffaloes (n = 679), maintained at Indian Council of Agricultural Research-Central Institute for Research on Buffaloes, Hisar, India during the period 1983 through 2017, were deduced to calculate heritability estimates, genetic and phenotypic correlation of different first lactation and lifetime traits. The univariate animal model was fitted to estimate variance components and heritability separately for each trait, while bivariate animal models were set to estimate genetic and phenotypic correlations between traits under study. Results: The heritability was high for first peak milk yield (FPY, 0.64±0.08), moderate for AFC (0.48±0.07) and breeding efficiency (BE 0.39±0.09). High genetic correlations of first lactation total milk yield (FLTMY) with first lactation standard milk yield (FLSMY, 305 days or less), FPY, and first lactation length (FLL) was seen. Likewise, genetic correlation of AFC was positive with FLTMY, FLL, first dry period (FDP), first service period (FSP), first calving interval (FCI), herd life (HL) and productive days (PD). Significant phenotypic correlation of FLTMY was observed with HL, productive life (PL), PD, total lifetime milk yield (LTMY), standard lifetime milk yield (standard LTMY). Moreover, positive genetic and phenotypic correlation of FPY was observed with HL, PL, PD, total LTMY and standard LTMY. Conclusion: This study reports that AFC had positive genetic correlation with FDP, FSP, FCI, and unproductive days while, negative association of AFC was observed with FLSMY, PL, total LTMY, standard LTMY, and BE. This suggests that reduction of AFC would results in improvement of lifetime performance traits. Objective: This study was conducted to estimate the association of age at first calving (AFC) with first lactation traits as well as lifetime performance traits in Murrah buffaloes.Methods: Data on first lactation and life time performance of Murrah buffaloes (n = 679), maintained at Indian Council of Agricultural Research-Central Institute for Research on Buffaloes, Hisar, India during the period 1983 through 2017, were deduced to calculate heritability estimates, genetic and phenotypic correlation of different first lactation and lifetime traits. The univariate animal model was fitted to estimate variance components and heritability separately for each trait, while bivariate animal models were set to estimate genetic and phenotypic correlations between traits under study.Results: The heritability was high for first peak milk yield (FPY, 0.64±0.08), moderate for AFC (0.48±0.07) and breeding efficiency (BE 0.39±0.09). High genetic correlations of first lactation total milk yield (FLTMY) with first lactation standard milk yield (FLSMY, 305 days or less), FPY, and first lactation length (FLL) was seen. Likewise, genetic correlation of AFC was positive with FLTMY, FLL, first dry period (FDP), first service period (FSP), first calving interval (FCI), herd life (HL) and productive days (PD). Significant phenotypic correlation of FLTMY was observed with HL, productive life (PL), PD, total lifetime milk yield (LTMY), standard lifetime milk yield (standard LTMY). Moreover, positive genetic and phenotypic correlation of FPY was observed with HL, PL, PD, total LTMY and standard LTMY.Conclusion: This study reports that AFC had positive genetic correlation with FDP, FSP, FCI, and unproductive days while, negative association of AFC was observed with FLSMY, PL, total LTMY, standard LTMY, and BE. This suggests that reduction of AFC would results in improvement of lifetime performance traits.

Catalytic developments in the direct dimethyl carbonate synthesis from carbon dioxide and methanol

Tamboli, Ashif H.,Chaugule, Avinash A.,Kim, Hern Elsevier 2017 Chemical Engineering Journal Vol.323 No.-

<P><B>Abstract</B></P> <P>The present review compiles the recently published literature for the single step dimethyl carbonate (DMC) synthesis from carbon dioxide (CO<SUB>2</SUB>) and methanol. The various routes of DMC synthesis are also discussed in short with their advantages and disadvantages in order to distinguish the merits of direct DMC synthesis route. Next, the major applications of DMC such as in electrochemistry, as fuels additive, as solvent and building block in organic synthesis are described. The major problems in the direct DMC synthesis route such as low yield, reaction rate, thermodynamic limitations and hydrolysis of produced DMC are also pointed out. Furthermore, the significance of fabricating an effective dehydrating agent for the removal of water from the reaction is narrated for the enhancement of DMC yield. The type of catalyst materials based on their nature i.e. metal carbonates, tin-based catalysts, metal oxides, organic catalysts and polymer based materials, etc. used for title reaction are separately discussed in details. The varieties of dehydrating agents and their role in DMC production is explained with the help of most recent reported literature.</P> <P><B>Highlights</B></P> <P> <UL> <LI> DMC are commonly used as fuel additive, in electrochemistry and organic synthesis. </LI> <LI> This study presents an overview of advances in direct DMC synthesis from CO<SUB>2</SUB> and methanol. </LI> <LI> It also summarizes the challenges such as necessity of dehydrating agents. </LI> <LI> And the uses of various catalysts to address challenges like low yield and thermodynamic limitations. </LI> </UL> </P>

Chitosan grafted polymer matrix/ZnCl₂/1,8-diazabicycloundec-7-ene catalytic system for efficient catalytic fixation of CO₂ into valuable fuel additives

Tamboli, A.H.,Chaugule, A.A.,Kim, H. Butterworths [etc.] ; Elsevier Science Ltd 2016 Fuel Vol.184 No.-

The chitosan grafted polymer matrix/ZnCl<SUB>2</SUB>/1,8-diazabicycloundec-7-ene (DBU) novel catalytic system was developed. It was found out that the microwave assisted technique was efficient for chitosan grafting compared to conventional chemical method. The morphology, thermal stability, functional groups, crystalline nature of grafted polymer matrix were investigated using scanning electron microscopy (SEM), thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FT-IR) and wide angle X-ray diffraction (WAXRD) techniques, respectively. SEM images revealed that the surface of chitosan became rough and cross-linked after grafting with amine derivatives. The prepared sorbent showed good CO<SUB>2</SUB> absorption capacity i.e. ~0.35mmol/g-catalyst, due to the presence of amines and hydroxyl CO<SUB>2</SUB> philic functional groups which shows an obvious positive effect on its CO<SUB>2</SUB> capture capacity. These properties enable this sorbent to be a promising catalyst for dimethyl carbonate (DMC) synthesis from methanol and CO<SUB>2</SUB>. DBU was used as a super base for methanol activation by abstracting acidic proton and ZnCl<SUB>2</SUB> for the activation of CO<SUB>2</SUB>. Remarkably, the excellent methanol conversion up to ~23% and ~99% DMC selectivity were achieved by Ch-g-PEI/ZnCl<SUB>2</SUB>/DBU catalysts system at ambient reaction conditions. Catalytic synthesis of organic carbonates is of significant interest both conceptually and practically because this can produce compounds from CO<SUB>2</SUB>. This synthesis can provide mild alternative approaches to the direct conversion of CO<SUB>2</SUB> to organic carbonates, an important fuel and building block for organic synthesis.