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151 results on '"Peela, Nageswara Rao"'

21. Composites of Reduced Graphene Oxide and MAPbI3 Crystals for Photocatalytic Hydrogen Generation.

Author

Pal, Tamal, Bhowmik, Soumalya, M, Ameer Suhail, Sharma, Sushant, Peela, Nageswara Rao, Sastri, Chivukula V., and Iyer, Parameswar Krishnan

Abstract

Lead halide perovskite has emerged as an alternate material for photocatalytic hydrogen (H2) evolution owing to its excellent optoelectronic properties. However, designing an efficient and stable perovskite photocatalyst system still remains a challenging task. Pristine MAPbI3 exhibited a lesser H2 evolution activity due to the lack of reactive sites and its faster degradation. Herein, reduced graphene oxides (RGOs) with varied chemical reduction were integrated with MAPbI3 microcrystals by in situ coupling to construct a robust and effective heterostructure resulting into a strong interconnection between MAPbI3 and RGO. Careful selection of cocatalysts with appropriate bandgaps and proper alignment of band positions are the key steps for successful photocatalytic H2 generation. This work highlights that facile and easy photogenerated charge separation and migration can be achieved for MAPbI3/RGO heterostructures where chemically modified RGOs having favorable bandgap and band positions were incorporated with MAPbI3 via unusual improved in situ crystallization resulting into remarkable mmol scale photocatalytic H2 evolution in aqueous HI medium under white light LED illumination. Under optimal reaction conditions, the H2 evolution rate can reach 4493 μmol g–1 h–1. [ABSTRACT FROM AUTHOR]

Published
2024
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32. Unraveling high alkene selectivity at full conversion in alkyne hydrogenation over Ni under continuous flow conditions

Author

Bakuru, Vasudeva Rao, primary, Fazl-Ur-Rahman, Kashifa, additional, Periyasamy, Ganga, additional, Velaga, Bharath, additional, Peela, Nageswara Rao, additional, DMello, Marilyn Esclance, additional, Kanakikodi, Kempanna S., additional, Maradur, Sanjeev P., additional, Maji, Tapas Kumar, additional, and Kalidindi, Suresh Babu, additional

Published
2022
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36. Thermal plasma gasification of organic waste stream coupled with CO2-sorption enhanced reforming employing different sorbents for enhanced hydrogen production

Author

Sikarwar, Vineet Singh, primary, Peela, Nageswara Rao, additional, Vuppaladadiyam, Arun Krishna, additional, Ferreira, Newton Libanio, additional, Mašláni, Alan, additional, Tomar, Ritik, additional, Pohořelý, Michael, additional, Meers, Erik, additional, and Jeremiáš, Michal, additional

Published
2022
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40. A Z‐Scheme Strategy that Utilizes ZnIn 2 S 4 and Hierarchical VS 2 Microflowers with Improved Charge‐Carrier Dynamics for Superior Photoelectrochemical Water Oxidation

Author

Ching Thian Moi, Gaurangi Gogoi, Anindya Sundar Patra, Mohammad Qureshi, Devipriya Gogoi, and Peela Nageswara Rao

Subjects
Photocurrent, 010405 organic chemistry, Chemistry, Organic Chemistry, Kinetics, Composite number, Charge (physics), General Chemistry, 010402 general chemistry, 01 natural sciences, Biochemistry, Capacitance, 0104 chemical sciences, Chemical engineering, Water splitting, Charge carrier, Surface charge
Abstract

One of the major limiting factors for efficient photoelectrochemical water oxidation is the fast recombination kinetics of photogenerated charge carriers. Herein, we propose a model system that utilizes ZnIn2 S4 and hierarchical VS2 microflowers for efficient charge separation through a Z-scheme pathway, without the need for an electron mediator. An impressive 18-fold increase in photocurrent was observed for ZnIn2 S4 -VS2 compared to ZnIn2 S4 alone. The charge-transfer dynamics in the composite were found to follow a Z-scheme pathway, which resulted in decreased charge recombination and greater accumulation of the surface charge. Furthermore, slow kinetics of the surface reaction in the ZnIn2 S4 -VS2 composite correlated to an increased surface-charge capacitance. This feature of the composite material facilitated partial storage of the photogenerated charge carriers (e- /h+ ) under illumination and dark-current conditions, thus storing and utilizing solar energy more efficiently.

Published
2019

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