Leena George
Council of Scientific and Industrial Research
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Publication
Featured researches published by Leena George.
RSC Advances | 2016
Sreekuttan M. Unni; Leena George; Siddheshwar N. Bhange; R. Nandini Devi; Sreekumar Kurungot
Here, we report the valorization of coffee bean waste (CBW) by producing nitrogen doped porous carbon (p-Cof) having both photocatalytic and electrocatalytic properties using a silica templating method. Morphological investigation of p-Cof reveals the presence of assemblies of highly porous flat carbon blocks. p-Cof exhibits a high surface area (1213 m2 g−1) and a wide range of micro- and mesopores with good electrical conductivity. Along with this, the surface of p-Cof displays the presence of graphitic and pyridone-type nitrogen coordinations, which help p-Cof to perform as a multifunctional catalyst as revealed from its catalytic activities towards photocatalytic hydrogen production (PHP) and electrocatalytic oxygen reduction reactions. p-Cof produces 334 μmol h−1 g−1 of hydrogen from water under visible light and 575 μmol h−1 g−1 of hydrogen under solar light irradiation with excellent stability. Along with this, p-Cof also displays improved oxygen reduction reaction (ORR) activity in alkaline medium. A better onset potential (0.91 V vs. RHE) and half-wave potential (0.75 V vs. RHE) are displayed by p-Cof compared to the catalyst derived from the simple annealing of CBW without employing the silica template. Along with the better electrochemical activity, p-Cof shows excellent ORR kinetics and electrochemical stability compared to the current state-of-the-art Pt/C.
New Journal of Chemistry | 2014
Bessy D'Cruz; Jadu Samuel; Mulloor Kesavapillai Sreedhar; Leena George
Synthesis of cetylpyridinium phosphotungstate (CPW) nanospheres was carried out by using sodium tungstate and a structure directing cationic surfactant, cetyl pyridinium chloride (CPC), at room temperature by applying green chemistry principles. The composition and morphology of the nanospheres were established by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), thermogravimetric analysis (TGA) and inductively coupled plasma atomic emission spectroscopic (ICP-AES) techniques. Thermal properties of the nanoparticles were investigated by non-isothermal analysis under a nitrogen atmosphere at four different heating rates 10, 15, 20 and 25 °C min−1. The thermal decomposition of CPW occurred in two stages. The activation energy values at each stage of thermal decomposition for all heating rates were calculated by Flynn–Wall–Ozawa (FWO) and Kissinger–Akahira–Sunnose (KAS) methods. The invariant kinetic parameter (IKP) method and the master plot method were also used to evaluate the kinetic parameters and mechanism for the thermal decomposition of CPW. The photocatalytic water oxidation mechanism using a CPW catalyst in the presence of a platinum (Pt) co-catalyst enhances the H2 evolution, which was found to be 2.0 mmol g−1 h−1.
RSC Advances | 2014
Bessy D'Cruz; Jadu Samuel; Leena George
Cetylpyridinium silicomolybdate (CSM) nanorods were successfully synthesized by applying green chemistry principles using sodium molybdate and a structure directing cationic surfactant, cetyl pyridinium chloride (CPC) at room temperature. The composition and morphology of the nanorods were established by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric analysis (TG) and inductively coupled plasma atomic emission spectroscopic (ICP-AES) techniques. The thermal decomposition kinetics of CSM nanorods were investigated by a non-isothermal thermogravimetric analyzer at various heating rates. The thermal decomposition of CSM occurred in two stages. The activation energies of the first and second stages of thermal decomposition for all heating rates have been estimated using the iso-conventional methods of Flynn–Wall–Ozawa (FWO) and Kissinger–Akahira–Sunose (KAS) and the results are found to be in good agreement with each other. The invariant kinetic parameter (IKP) method and master plot method were also used to evaluate the kinetic parameters and mechanism for the thermal decomposition of CSM. The photocatalytic water oxidation mechanism using the CSM catalyst in the presence of platinum (Pt) co-catalyst enhances the H2 evolution and was found to be 1.946 mmol g−1 h−1.
Advanced Energy Materials | 2016
Shyamapada Nandi; Santosh K. Singh; Dinesh Mullangi; Rajith Illathvalappil; Leena George; C. P. Vinod; Sreekumar Kurungot; Ramanathan Vaidhyanathan
Nanoscale | 2014
Vishal M. Dhavale; Sachin S. Gaikwad; Leena George; R. Nandini Devi; Sreekumar Kurungot
Journal of Physical Chemistry C | 2015
Leena George; Subrahmanyam Sappati; Prasenjit Ghosh; R. Nandini Devi
Journal of Molecular Catalysis A-chemical | 2016
Soumya B. Narendranath; Saranya V. Thekkeparambil; Leena George; Shibin Thundiyil; R. Nandini Devi
Thermochimica Acta | 2014
Bessy D’Cruz; Jadu Samuel; Leena George
Catalysis Today | 2017
Leena George; Subrahmanyam Sappati; Prasenjit Ghosh; R. Nandini Devi
Physical Chemistry Chemical Physics | 2016
Leena George; Athira K. Kunhikannan; Rajith Illathvalappil; Divya Ottoor; Sreekumar Kurungot; R. Nandini Devi
Collaboration
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Jawaharlal Nehru Centre for Advanced Scientific Research
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