Uttam Kumar Ghorai

Ramakrishna Mission Vidyamandira

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Kalyan Kumar Chattopadhyay

Jadavpur University

Ashadul Adalder

Ramakrishna Mission Vidyamandira

Subhajit Saha

Jadavpur University

D. Banerjee

Teerthanker Mahaveer University

Ranjit Thapa

SRM University

Sourav Paul

Ramakrishna Mission Vidyamandira

Nilesh Mazumder

Jadavpur University

Dipayan Sen

Indian Institute of Technology Kharagpur

Rajarshi Roy

Jadavpur University

N.S. Das

Jadavpur University

Cooperative Institutions

Jadavpur University

105

Indian Association for the Cultivation of Science

Indian Institute of Technology Kharagpur

Ramakrishna Mission Vidyamandira

University of Calcutta

Indian Institute of Engineering Science and Technology, Shibpur

Indian Institute of Technology Kanpur

Graphic Era University

Indian Institute of Science Bangalore

Indian Institute of Technology Roorkee

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Efficient cold cathode emission in crystalline-amorphous hybrid: Study on carbon nanotube-cadmium selenide system

Physica E Low-dimensional Systems and Nanostructures (2017)

Sourav Sarkar D. Banerjee Nirmalya Sankar Das Uttam Kumar Ghorai Dipayan Sen

Amorphous carbon

Cadmium selenide

10.1016/j.physe.2017.11.003

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Citations (7)

Solution processed Copper Phthalocyanine nanowires: A promising supercapacitor anode material

Physica E Low-dimensional Systems and Nanostructures (2019)

Madhupriya Samanta Promita Howli Uttam Kumar Ghorai Moumita Mukherjee Chayanika Bose

Horizontal scan rate

10.1016/j.physe.2019.113654

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Citations (22)

Nickel doped graphitic carbon nitride nanosheets and its application for dye degradation by chemical catalysis

Materials Research Bulletin (2018)

Dimitra Das D. Banerjee Monojit Mondal A. Shett Biswajit Das

Graphitic carbon nitride

Sodium borohydride

Thermal Stability

Methyl orange

10.1016/j.materresbull.2018.02.004

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Citations (76)

Efficient Fluoride Removal and Dye Degradation of Contaminated Water Using Fe/Al/Ti Oxide Nanocomposite

ACS Omega (2019)

Arnab Mukherjee Mrinal Kanti Adak Sudipta Upadhyay Julekha Khatun Prasanta Dhak

The trimetallic Fe/Al/Ti (1:1:1) nanocomposite (FAT), synthesized by an adaptable tuned chemical route, offers a new approach for water treatment, for example, the de-fluoridation and photodegradation soluble dye methylene blue (MB) at pH 7. FAT acted as a good fluoride scavenger in the presence of other co-ions and within a widespread pH range (pH 2-11). The photodegradation efficiencies were >90% for different concentrations of MB solutions. The characterization of FAT includes thermogravimetric analysis, X-ray diffraction, Fourier transform-infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, and ζ-potential analysis. Furthermore, the regeneration efficiencies of both the water treatments were checked, where the removal efficiency was not hampered significantly even after five batches. Spectroscopic techniques were adopted to perform the kinetic studies and to propose the probable mechanistic paths.

Degradation

Contaminated water

10.1021/acsomega.9b00252

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Amorphous Carbon Nanotubes-Molybdenum Disulphide: A Potential Material for Energy Storage

SSRN Electronic Journal (2022)

Kritika Jain Parijat Bhowmick Biswajit Das Jayati Sarkar A. Gain

Owing to the increasing need for energy generation and storage, here the supercapacitor application of amorphous carbon nanotubes (a-CNTs)-Molybdenum disulphide (MoS2) hybrids has been reported. The a-CNT-MoS2 hybrid was developed by a simple solvo-thermal approach at temperature as low as 250 oC. By varying initial reagent two hybrid samples having two different morphologies of MoS2 were prepared and characterized (along with pure a-CNTs) with techniques like X-ray diffraction, electron microscopy and EDX analysis. The optical studies were done by Raman, Fourier transformed infrared, UV-Visible spectrophotometer. Detail electrochemical analysis through cyclic voltmetric study shows that as prepared hybrid samples can be used as an efficient supercapacitor material with specific capacitance 511 F/g at scan rate of 5 mV/second. The material shows high Coulombic efficiency over 1200 cycles and good rate capability thus can be considered to be a promising material for the charge storage application. The surface area and porosity are considered to be the key parameters for the efficient ion exchange and thus offering higher capacitance values. When compared with existing literature it is seen that our hybrid offers comparable or even better storage performance with the further advantages of low cost high yield synthesis techniques over the existing system.

Amorphous carbon

Carbon fibers

10.2139/ssrn.4134147

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Citations (1)

Supramolecular Design Strategies for Color Tuning of Iridium(III) Complexes Using a Common Framework of Cyclometalating Ligands

The Journal of Physical Chemistry C (2021)

Sandip Biswas Bidisa Das Parvej Alam Arnab Ghatak Uttam Kumar Ghorai

Organic light emitters have shown potential for the application in a variety of optoelectronic devices. However, the quenching of luminescence in the solid state severely restricts the lighting applications. The rational supramolecular design strategy of the luminescent organic emitters in solid state remains challenging. Here, supramolecular assemblies of a series of iridium(III) complexes are designed on a water surface to realize solid state tunable luminescence in the visible region. Large area two-dimensional supramolecular platelets and disks, yet with monomolecular thickness, are formed depending on the cyclometalating ligands. Controlled supramolecular aggregates of iridium(III) complexes enhances the aggregation-induced-emission phenomenon by restricting monodentate triphenylphosphine and cyclometalating ligands at the water surface. As a consequence, a large enhancement of luminescence comparable to the solid powder is obtained from the supramolecular assemblies of iridium(III) complexes. Supramolecular assemblies display fine-tuning of the luminescence color from green to red in solid state depending on the cyclometalating ligand. Density functional theory (DFT) and time-dependent density functional theory (TD-DFT) reveal phosphorescence origin of the luminescence. These findings emphasize the importance of controlled organization of organic emitters to explore optimal luminescence properties for efficient lighting applications.

10.1021/acs.jpcc.0c11570

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Citations (8)

Efficiency evaluation of arsenic(III) adsorption of novel graphene oxide@iron-aluminium oxide composite for the contaminated water purification

Separation and Purification Technology (2018)

Sweta Maji Ayan Ghosh Kaushik Gupta Abir Ghosh Uttam Kumar Ghorai

Langmuir adsorption model

Aluminium oxides

10.1016/j.seppur.2018.01.021

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Citations (76)

Magneto-electrochemical ammonia synthesis: Boosting nitrite reduction activity by the optimized magnetic field induced in spin polarized system

Ashadul Adalder Koushik Mitra Narad Barman Ranjit Thapa S. Bhowmick

Using low and optimized magnetic field along with electric field is a novel strategy to facilitate electrochemical nitrite reduction. Here, we report for the first time on the synthesis of ammonia via magneto-electrocatalytic methods that use spin-thrusted β-MnPc in a magnetic field of 95 mT. The calculated rate of ammonia generation was 16603.4 µg h-1 mgcat-1, which is almost twice that of the non-polarized MnPc catalyst. Additionally, the faradaic efficiency at –0.9V vs. RHE was found to be 92.9%, significantly higher compared to the non-polarized MnPc catalyst. In presence of external magnetic field, MnPc catalysts provide a better electron transfer channel which results in a lower charge transfer resistance and hence better electrochemical performances. DFT result further verifies that magnetic field induced β-MnPc has a lower potential barrier (0.51 eV) for the protonation of NO* (PDS) than non-polarized β-MnPc (1.08 eV), which confirms the enhanced electrochemical nitrite reduction to ammonia aided by external magnetic field.

Boosting

Ammonia production

Magneto

10.26434/chemrxiv-2024-v8chs

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Efficacy of nickel doped graphitic carbon nitride as energy storage material

Physica Scripta (2024)

Manu Parashar D. Banerjee Kavita Chauhan Ashadul Adalder Uttam Kumar Ghorai

Abstract The current article reports the synthesis of graphitic carbon nitride (GCN), through simple thermal decomposition of urea at a moderate temperature of 550 oC and doping of as-developed material with transition element like nickel. The proper phase formation of the sample was confirmed by X-ray diffraction whereas electron microscopic images analyzed the sample morphologies. The successful doping was verified by X-ray photoelectron spectroscopy whereas thermogravimetric study predicted the stability of the material under elevated temperature. Fourier transformed infrared spectroscopy showed that after Ni doping there is a substantial change in the vibrational energy level of the sample. UV-Vis reflectance spectra confirmed the reduction of optical bandgap after metal doping. The samples show promises towards supercapacitor application. Cyclic voltametric study shows that after metal doping the value of specific capacitance became 162 Fg-1 at scan rate 5 mV/s and when the same was calculated from galvanostatic charging-discharging characteristics the values came even higher. The energy and power density of both the samples was calculated and all these when compared with different reported results, confirmed the performance of Ni doped GCN is comparable and sometimes even far better along with the advantages of the easy, large scale and high yield synthesis approach.

Graphitic carbon nitride

Carbon fibers

10.1088/1402-4896/ad96ea

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Citations (0)

Ferroelectric and photocatalytic behavior of Mn- and Ce-doped BaTiO3 nanoceramics prepared by chemical route

Materials Science and Engineering B (2020)

Mrinal Kanti Adak Debasish Mondal Suman Mondal Suman Kar Shubha J. Mahato

10.1016/j.mseb.2020.114800

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Citations (37)