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( Mandari Kotesh Kumar ),손남규,김양수,강미숙 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
In this work, Ag<sub>3</sub>PO<sub>4</sub>/MoS<sub>2</sub> material prepared by precipitation method for the photocatalytic evolution of H<sub>2</sub> in lactic acid-water mixture. The optimum Ag<sub>3</sub>PO<sub>4</sub>/MoS<sub>2</sub> nanocomposite showed improved H<sub>2</sub> yield, which is ascribed to the improved visible absorption and inhibit the recombination of electron-hole pairs for the formation of electron trapping centers over the surface. These Ag<sub>3</sub>PO<sub>4</sub> and MoS<sub>2</sub> species are favourable materials in this photocatalytic hydrogen reaction with no substantial loss of activity even later several recycles of consecutive studies. This study provides novel insights for the engineering of stable photocatalysts to generate rich and active sites for efficient H<sub>2</sub> evolution.
Mandari, Kotesh Kumar,Do, Jeong Yeon,Vattikuti, S.V. Prabhakar,Police, Anil Kumar Reddy,Kang, Misook Elsevier 2018 Journal of alloys and compounds Vol.750 No.-
<P><B>Abstract</B></P> <P>A novel Cu<SUB>3</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB>/TiO<SUB>2</SUB> nanoparticle (TNP)/CuO nanocomposite with an excellent natural solar-light-driven photocatalytic H<SUB>2</SUB> production performance was synthesized using a sol-gel method. The 1%Cu<SUB>3</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB>/TNP/CuO catalyst displayed a better photocatalytic H<SUB>2</SUB> production yield (59.5 mmolg<SUP>−1</SUP>; natural solar light; 151 times higher than that of TNP under the optimal conditions; catalyst dosage of 0.010 g and 5% aqueous glycerol concentration) than TNP, CuO/TNP, Cu<SUB>3</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB>/TNP, and various Cu<SUB>3</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB> loadings in the Cu<SUB>3</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB>/TNP/CuO catalysts. The improved photocatalytic H<SUB>2</SUB> yields could be attributed to a suppressed recombination of charge carriers, preferable visible absorption ability, crystallinity, strong interactions, and high surface areas of 1%Cu<SUB>3</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB>/TNP/CuO, which were confirmed using X-ray diffraction, temperature programmed reduction, diffuse reflectance spectroscopy, transmission electron microscopy (TEM), high-resolution TEM, Brunauer-Emmett-Teller surface area analysis, elemental mapping, energy dispersive X-ray analysis, X-ray photoelectron spectroscopy, electron paramagnetic resonance spectroscopy, Raman spectroscopy, photoluminescence, and photocurrent techniques. The 1%Cu<SUB>3</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB>/TNP/CuO catalyst could also contribute to the enhanced photostability and recyclability towards the photocatalytic hydrogen production.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Cu<SUB>3</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB>/TNP/CuO nanocomposites were prepared by sol-gel method. </LI> <LI> Cu<SUB>3</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB>/TNP/CuO shows enhanced visible absorption and inhibit the recombination. </LI> <LI> Strong interaction between Cu<SUB>3</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB> and/or CuO nanoclusters with TNP by H<SUB>2</SUB>-TPR. </LI> <LI> Synergetic effect of Cu<SUB>3</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB>, CuO and TNP displayed effective redox reactions. </LI> <LI> Optimum H<SUB>2</SUB> yields obtained 59.5 mmol g<SUP>−1</SUP>, 151 times toTNP. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
( Mandari Kotesh Kumar ),곽병섭,도정연,강미숙 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Non-metal (i.e., P) and non-noble metal (i.e., Cu) doped semiconductor promoted P/Cu/CuO/Cu<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>/TNP nanocomposite with excellent natural solar light driven photocatalytic hydrogen production performance was fabricated using a sol-gel and followed by photo-assisted reduction method. Compared to other nanocomposites, P/Cu/CuO/Cu<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>/TNP displayed more superior photocatalytic hydrogen production yield, which is 151 fold higher than that of TNP. The improved photocatalytic hydrogen production activities could be attributed that suppressing the recombination of charge carriers, preferable absorption ability and high surface area values of P/Cu/CuO/Cu<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>/TNP, which were confirmed with XRD, TPR, DRS, HRTEM, Surface area, XPS, EPR, Raman and PL techniques.
( Mandari Kotesh Kumar ),도정연,강미숙 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
The integration of tri-component semiconductors are a promising approach to utilize the solar light without the compromise of the redox ability of photogenerated charge carriers for H<sub>2</sub> generation. In this study, a less finicky and effective method is developed to synthesize Fe<sub>2</sub>O<sub>3</sub>/TiO<sub>2</sub>/AgVO<sub>3</sub> heterostructures. The as synthesized samples are characterized by XRD, SEM, TEM, HRTEM, XPS, EDAX, UVDRS, PL, RAMAN and FTIR techniques. The photocatalytic activity of Fe<sub>2</sub>O<sub>3</sub>/ TiO<sub>2</sub>/AgVO<sub>3</sub> heterostructures are evaluated by hydrogen production under solar irradiation. The possible mechanism for the enhanced photocatalytic properties of Fe<sub>2</sub>O<sub>3</sub>/TiO<sub>2</sub>/AgVO<sub>3</sub> heterostructure is also discussed.
Mandari, Kotesh Kumar,Do, Jeong Yeon,Police, Anil Kumar Reddy,Kang, Misook Elsevier 2018 Applied Catalysis B Vol.231 No.-
<P><B>Abstract</B></P> <P>Plasmonic Co and/or Ag monometal and their combinations as bimetal alloy and core-shell nanoparticles were prepared under natural sun light, using aqueous glycerol (in-situ reducing agent) and TNP (stabilizer). The formation of bimetallic alloy and core-shell NPs, and their uniform dispersion on the surface of TNP were evidenced by different characterization techniques. Ultraviolet-visible diffuse reflectance spectroscopy evidenced the two distinct characteristic surface plasmon resonance (SPR) absorption bands for the core-shell nanoparticles and a single distinct characteristic SPR band for the alloy. X-ray photoelectron spectroscopy revealed the presence of Ag and Co in the metallic form. The results of H<SUB>2</SUB>-temperature programmed reduction of fresh and used samples emphasized the characteristic reduction peaks for the reduction of monometal/bimetal oxide to metallic/bimetallic particles. The interaction of the loaded bimetallic particles with TNP resulted in a shift in the Raman bands. The photoluminescence spectra of the used samples revealed the formation of bimetallic alloy and core-shell structures, which resulted in a decrease in the recombination of charge carriers. X-ray diffraction, electron paramagnetic resonance spectroscopy, high-resolution transmission electron microscopy, and cyclic voltammetry analyses substantiated the same. The monometal-loaded photocatalysts and the bimetal alloy and core-shell nanoparticle-loaded photocatalysts were further examined for H<SUB>2</SUB> production with pure water/aqueous glycerol/crude glycerol under natural solar light irradiation. The (Ag-Co)<SUB>coloaded</SUB>TNP catalyst yielded the maximum H<SUB>2</SUB> evolution rate of 63 mmol g<SUP>−1</SUP>. For comparison, experiments were conducted under artificial solar light irradiation with similar experimental conditions. Based on the results, different mechanistic paths for insitu photoreduced Ag-Co bimetallic alloy and core-shell nanoparticles on TNP for H<SUB>2</SUB> production are envisaged.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Co/Ag bimetal alloy and core-shell are synthesized by in-situ photoreduction. </LI> <LI> Ag<SUB>core</SUB>@Co<SUB>shell</SUB> loaded TiO<SUB>2</SUB> exhibited enhanced H<SUB>2</SUB> production under sun light. </LI> <LI> Different aqueous scavengers are tested for H<SUB>2</SUB> production under solar light. </LI> <LI> Alloy and core-shell NPs act as electron sink and efficiently suppress the recombination. </LI> <LI> The formation mechanism of bimetal alloy and core-shell structures were discussed. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>