BITS Faculty Publications

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Author: search.filters.author.Basu, MrinmoyeeSubject: search.filters.subject.Catalysts

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    Resin-Immobilized CuO and Cu Nanocomposites for Alcohol Oxidation
    (ACS, 2008) Basu, Mrinmoyee; Pande, Surojit
    Resin immobilized stable, spherical CuO nanoparticles prepared in the presence of cyclodextrin (CD) act as catalysts for liquid phase alcohol oxidation in air. The catalytic activity of the CuO nanocomposites and its green chemistry approach make it superior to the related resin-bound Cu(0) nanocomposite. The effect of alcohol chain length and electron-donating or -withdrawing groups influence product yield. The nanocomposites exhibit good reusability, simple workup procedure, and a straightforward approach to aldehyde formation.
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    The CoTe2 nanostructure: an efficient and robust catalyst for hydrogen evolution
    (RSC, 2015) Basu, Mrinmoyee
    Cobalt ditelluride nanoparticles in a diameter range of 20–50 nm were synthesized as a new electrocatalyst for the hydrogen evolution reaction in 0.50 M H2SO4(aq). These nanoparticles can generate −10 mA cm−2 at an overpotential of 246 mV without any decay up to 48 h of continuous reaction.
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    Ag2S/Ag Heterostructure: A Promising Electrocatalyst for the Hydrogen Evolution Reaction
    (ACS, 2017) Basu, Mrinmoyee; Pande, Surojit; Gangopadhyay, Subhashis
    Different metal chalcogenides, being a potential candidate for hydrogen evolution catalysts, have attracted enormous attention in the field of water splitting. In the present study, Ag2S/Ag is revealed as an efficient catalyst for hydrogen evolution. When a sacrificial template of the CuS nanostructure is used, Ag2S/Ag heterostructures are synthesized following a simple wet-chemical technique. Two different routes, wet chemical and hydrothermal, are followed to modulate the morphology of the CuS templates from flower ball to wirelike structures, which subsequently results in the formation of Ag2S nanostructure. Finally, the Ag layer is deposited on Ag2S with the help of a photoreduction technique. The unique heterostructure of Ag2S/Ag shows efficient catalytic activity in the H2 evolution reaction. A Ag2S/Ag wire can successfully generate a 10 mA/cm2 current density at a −0.199 V potential. Ag2S/Ag contains the micronanostructure where nanoplates of Ag2S/Ag assemble to give rise to microstructures such as flower balls and wire.
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    Nanosheets of NiCo2O4/NiO as Efficient and Stable Electrocatalyst for Oxygen Evolution Reaction
    (ACS, 2017) Basu, Mrinmoyee
    Development of a stable catalyst that can efficiently function for longer time for energy conversion process in water splitting is a challenging work. Here, NiCo2O4/NiO nanosheets are successfully synthesized following a simple wet-chemical route, followed by the combustion technique. Finally, the synthesized catalyst NiCo2O4/NiO can function as an efficient catalyst for oxygen evolution reaction. Nanosheets with interconnections are very useful for better electron transportation because the pores in between the sheets are useful for the diffusion of electrolyte in electrocatalysis. In oxygen evolution reaction, these sheets can generate current densities of 10 and 20 mA/cm2, respectively, upon application of 1.59 and 1.62 V potential versus reversible hydrogen electrode (RHE) under alkaline condition. In contrast, bare NiCo2O4 nanowire bundles can generate a current density of 10 mA/cm2 upon application of 1.66 V versus RHE. The presence of NiO in NiCo2O4/NiO nanosheets helps to increase the conductivity, which further increases the electrocatalytic activity of NiCo2O4/NiO nanosheets.