Search

Your search keyword '"Bora, Debashree"' showing total 16 results
Start Over Author "Bora, Debashree"
16 results on '"Bora, Debashree"'

4. Photosensitization of Ir-Dye on TiO2for Enhanced Hydrogen Evolution: Presence of Ferrocene Matters

Author

Shelake, Sandip Prabhakar, Bora, Debashree, Kshirsagar, Switi Dattatraya, Gayen, Firdaus Rahaman, Karmodak, Naiwrit, Mallick, Dibyendu, Sainath, Annadanam V. Sesha, Saha, Biswajit, and Pal, Ujjwal

Abstract

Dye-sensitized photochemical hydrogen evolution is potentially promising and ecofriendly but often suffers from low stability and photocatalytic activities. The Ir(III) complex plays an important role in photoinduced energy and electron transfer processes, along with excellent luminescence properties, such as high emission intensities and long lifetimes. In this work, a heterobimetallic Fe∧Ir photosensitizer has been rationally designed and synthesized for solar hydrogen evolution application. Harnessing visible light with a significantly high lifetime of 592 ns of bimetallic boosts hydrogen evolution performance compared to a monometallic system, i.e., without a ferrocene auxiliary (390 ns). The longer lifetime of Fe∧Ir-dye is attributed to the extension of π-conjugation achieved by the ferrocene moiety into the ancillary ligand. The investigated materials exhibited the highest rate of ∼8.04 mmol g–1h–1(AQY = 19.68%, TON = 14894) under visible light, and at neutral pH. Fe∧Ir-dye demonstrates quasi-reversible redox processes for IrIII/IValongside a reversible reduction of bpy0/bpy–1. The induction of redox-active ferrocene in Fe∧Ir-dye altered the overall electronic properties of the catalyst. The light-harvesting ability, theoretical molecular orbital levels, and redox potential behavior of the dye-sensitized photocatalysts are systematically investigated, complementing the superior activity of the designed material.

Published
2024
Full Text
View/download PDF

16. Design of a Photoactive Bimetallic Cu‐Au@g‐C3N4 Catalyst for Visible Light Driven Hydroxylation of the Benzene Reaction through C–H Activation.

Author

Bhuyan, Bishal, Devi, Meghali, Bora, Debashree, Dhar, Siddhartha Sankar, and Newar, Rajashree

Subjects
BIMETALLIC catalysts, NITRITES, VISIBLE spectra, BENZENE, HYDROXYLATION
Abstract

In the present study, a new photoactive bimetallic Cu‐Au@g‐C3N4 catalytic system was designed by impregnating Cu and Au NPs over the graphitic carbon nitrite (g‐C3N4) surface. Characterization of the catalyst using multiple techniques illustrated that very small‐sized Cu and Au NPs were monodispersed on the g‐C3N4 surface, which were obtained by the in situ reduction of the metal salts using sodium borohydride. The as‐synthesized bimetallic Cu‐Au@g‐C3N4 catalyst efficiently catalyzed the hydroxylation of benzene (HOB) via C–H activation under visible light irradiation at room temperature. The dominant role of the synergistic interaction between Cu and Au NPs were further elucidated by high resolution transmission electron microscopy (HR‐TEM) studies and X‐ray photoelectron spectroscopy (XPS) analysis. This study may provide a new avenue for the preparation of photoactive bimetallic catalysts and offers insight into the synergistic interaction of bimetallic catalytic HOB reactions. [ABSTRACT FROM AUTHOR]

Published
2018
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results