Publications by authors named "Nageswara Rao Peela"

3 Publications

  • Page 1 of 1

Step-Scheme Heterojunction between CdS Nanowires and Facet-Selective Assembly of MnO-BiVO for an Efficient Visible-Light-Driven Overall Water Splitting.

ACS Appl Mater Interfaces 2021 Sep 14;13(38):45475-45487. Epub 2021 Sep 14.

Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India.

The spatial separation and transport of photogenerated charge carriers is crucial in building an efficient photocatalyst for solar energy conversion into chemical energy. A step-scheme CdS/MnO-BiVO photocatalyst was synthesized by spatial deposition of MnO and one-dimensional (1D) CdS nanowires on a three-dimensional (3D) decahedron BiVO surface. The photocatalytic activity of CdS/MnO-BiVO for the overall water-splitting reaction was investigated without sacrificial reagent under visible light irradiation. The synthesized photocatalysts were thoroughly analyzed using high-end characterization techniques. The 5CdS/MnO-BiVO exhibited the highest H and O production rates of 1.01 and 0.51 mmol g h, respectively, with an apparent quantum yield of 11.3% in the absence of any sacrificial reagent. The excellent photoactivity is due to the presence of oxygen vacancies along with effective charge separation/transfer properties and strong interaction of cocatalysts (MnO and Pt) with the photocatalysts (BiVO and CdS) in the 5CdS/MnO-BiVO heterojunction. The significance of the presence of MnO and Pt cocatalysts on the selective facets of BiVO for efficient overall water splitting reaction is highlighted in this work.
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http://dx.doi.org/10.1021/acsami.1c11740DOI Listing
September 2021

Hollow cuboidal MnCoO coupled with nickel phosphate: a promising oxygen evolution reaction electrocatalyst.

Chem Commun (Camb) 2021 Aug;57(65):8027-8030

Department of Chemistry, Indian Institute of Technology Guwahati, Assam 781039, India.

The growth of hierarchical morphologies of complex metal oxides directly on the substrate is a challenging task. Herein we report a unique hollow-cuboidal MnCo2O4 (h-MCO) morphology that offers insights into the efficient charge-transfer and surface kinetics for the oxygen evolution reaction. h-MCO coupled nickel phosphate under alkaline conditions outperforms the benchmark RuO2.
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http://dx.doi.org/10.1039/d1cc02383gDOI Listing
August 2021

Hybridization of Pd Nanoparticles with UiO-66(Hf) Metal-Organic Framework and the Effect of Nanostructure on the Catalytic Properties.

Chemistry 2018 Oct 5;24(60):15978-15982. Epub 2018 Oct 5.

Materials Science Division, Poornaprajna Institute of Scientific Research, Devanahalli, Bangalore Rural-, 562164, India.

Metal-organic frameworks (MOFs) have emerged as a new class of supports for metal nanoparticles(NPs) in heterogeneous catalysis because of possible synergetic effects between the two components. In addition, MOFs also can be coated over metal NPs to influence the entire nanoparticle's surface. Herein, NPs were hybridized with UiO-66(Hf) MOF possessing Brønsted acidic sites (on secondary building units) and fabricated [email protected] (Hf) core-shell and Pd/UiO-66(Hf) supported catalysts. These hybrid materials exhibited enhanced catalytic properties (TOF increased up to 2.5 times) compared to individual counterparts or their physical mixture for dehydrogenation of ammonia borane(AB) in non-aqueous medium(1,4-dioxane). Further, nanostructure of the hybrid material had pronounced influence on the catalytic properties. The core-shell catalyst exhibited highest activity towards H generation from AB owing to greater contact interface between Pd and MOF. Further, phenylacetylene semi-hydrogenation with AB over [email protected] (Hf) furnished styrene selectivity as high as 93.2 % at ∼100 % conversion mostly due to the regulated phenylacetylene diffusion through UiO-66(Hf) shell.
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http://dx.doi.org/10.1002/chem.201803200DOI Listing
October 2018
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