@article {44356, title = {Hydrothermal synthesis of rGO-PbBi2Se4 composite and investigation of its structural, chemical and field emission properties}, journal = {Journal of Materials Science-Materials in Electronics}, volume = {29}, year = {2018}, month = {JUN}, pages = {10494-10503}, type = {Article}, abstract = {In the present study we report the one step facile synthesis of pristine lead bismuth selenide (PbBi2Se4) and reduced graphene oxide (rGO) and its composites with PbBi2Se4. Formation of pristine PbBi2Se4 and rGO-PbBi2Se4 composite were confirmed by X-ray diffraction and X-ray photoelectron spectroscopy. The surface morphology and topography investigated by using scanning electron microscopy and transmission electron microscopy revealed the formation of nano-flowers pristine PbBi2Se4. After coupling pristine PbBi2Se4 with rGO the surface morphology shows the formation of sharp vertically protruded nano-sheets/nano-flaks originated from the nano-flowers. Finally, the field emission properties of pristine PbBi2Se4 and rGO-PbBi2Se4 composite have been investigated. It has been observed that the rGO-PbBi2Se4 composite emitter exhibited excellent field emission properties with low turn-on field (similar to 2.8 V/A mu m for 10 A mu A/cm(2)), high emission current density (similar to 1288 A mu A/cm(2) at 3.9 V/A mu m) and superior current stability (similar to 4.5 h for similar to 1 A mu A) compare to pristine PbBi2Se4 emitter. Thus, the facile one step synthesis approach and robust nature of rGO-PbBi2Se4 composite emitter can provide prospects for the future development of large-area emitter applications such as flat-panel-display and vacuum micro/nanoelectronics devices.}, doi = {10.1007/s10854-018-9114-0}, author = {Aher, Rahul and Bhorde, Ajinkya and Sharma, Priyanka and Nair, Shruthi and Borate, Haribhau and Pandharkar, Subhash and Rondiya, Sachin and Chaudhary, Minakshi and Gopinath, Chinnakonda and Suryawanshi, Sachin and More, Mahendra and Jadkar, Sandesh} } @article {44565, title = {Role of palladium crystallite size on CO oxidation over CeZrO 4-δ supported Pd catalysts}, journal = {Journal of Molecular Catalysis }, volume = {455}, year = {2018}, month = {AUG}, abstract = {Photodeposited palladium on nanocrystalline CeZrO 4-δ support was evaluated for CO oxidation, as a function of particle size and pre-treatment. All the catalysts were well characterized by XRD, SEM, EDX, TEM, CO chemi-sorption and Raman spectroscopy. It was observed that change in photodeposition time alters the average crystallite size of Pd, and the same was confirmed by CO chemisorption. 7 nm average crystallite size of Pd exhibited excellent catalytic activity for CO oxidation. In order to understand the effect of support and metal-support interaction, 1 wt\% Pd was deposited deliberately onto reduced and oxidized CeZrO 4-δ support. The reduced support with anionic vacancies and more Ce 3+ species exhibited an improvement in CO oxidation at onset temperature. Detailed analysis shows that Pd-deposition occurs preferentially at oxygen-vacancy sites and subsequent metal-support interaction influences the catalysis.}, doi = {10.1016/j.mcat.2018.05.021}, author = {Burange, Anand S. and Reddy, Kasala Prabhakr and Gopinath, Chinnakonda and Shukla, Rakesh and Tyagi, Avesh K.} } @proceedings {47332, title = {Photocatalytic hydrogen production from H2S using nanostructured CNT blended CdZnS/Fe2O3 thin film on glass substrate}, volume = {1495}, year = {2020}, month = {MAR}, publisher = {IOP Publishing Ltd}, abstract = {

A co-precipitation method was employed to prepare the CNT blended CdZnS/Fe2O3\ photocatalyst. Using the powder photocatalyst, the thin film of CNT blended CdZnS/Fe2O3\ photocatalyst over a glass substrate was prepared using the drop-casting method. The obtained thin film was characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), energy-dispersive X-ray analysis (EDAX), photoluminescence (PL), and hydrogen production activity studies in order to obtain information on their structural, morphology, chemical composition, optical and hydrogen production efficiency. The hydrogen production activity of catalyst or effective conversion of H2S into hydrogen (H2) and sulfur (S) using thin-film photocatalyst was evaluated using a simulated sulfide solution. The results showed that 1 mg of CNT blended CdZnS/Fe2O3\ catalyst coated as thin film over glass substrate (4.69 cm2) showed the highest hydrogen production value of 3180 μmol h-1g-1; compared to that of 1 mg CNT blended CdZnS/Fe2O3\ powder of 2510 μmol h-1g-1. From the above results, it is concluded that the thin film form of photocatlyst produced more hydrogen than the powder form. This is attributed to the effective charge separation and increased specific surface area in thin film photocatalyst.

}, doi = {10.1088/1742-6596/1495/1/012035}, author = {Raja, M. Anthony and Vijayarengan, Preethi and Pal, Yash and Nalajala, Naresh and Gopinath, Chinnakonda} } @inbook {47320, title = {Shape-controlled metal oxides for selective catalytic oxidation}, booktitle = {Advanced Heterogeneous Catalysts Volume 1: Applications at the Nano-Scale}, year = {2020}, pages = {291-318}, publisher = {Publisher: American Chemical Society}, organization = {Publisher: American Chemical Society}, abstract = {

Some of industrial processes involve selective oxidation reactions that include the use of corrosive and nonbenign oxidants and solvents. Many metal oxide-based catalysts have been reported for selective oxidation processes, and they exhibit a range of activities compared to homogeneous protocols and current practices. To bridge the gap between homogeneous and heterogeneous catalysis in terms of activity and selectivity and move toward green oxidation processes, this chapter discusses the shape-controlled synthesis of a selected range of metal oxides and their applications in selective catalytic oxidation reactions. This chapter also discusses some of the interesting micro- and nanostructured materials used in these reactions, as well as the roles of exposed predominant facets, defects, and other features and their effects on catalysis. Oxides of Mn, Co, Ce, Cu, Fe, La, and some combinations thereof are presented. Chemical reactions such as the selective oxidations of alcohol, ethyl benzene, styrene, xylene, and 5-hydroxymethylfurfural and the preferential oxidation of CO are also discussed.

}, doi = {10.1021/bk-2020-1359.ch010}, author = {Burange, Anand S. and Gopinath, Chinnakonda} }