Shehna Farooq - Academia.edu (original) (raw)

Papers by Shehna Farooq

Materials Chemistry and Physics

Journal of Scientific and Innovative Research

COVID-19 resulted in a pandemic causing respiratory infection due to the SARS-CoV-2 virus. It sta... more COVID-19 resulted in a pandemic causing respiratory infection due to the SARS-CoV-2 virus. It started from the Wuhan city of China in mid-December 2019 and then spread all over the world in a very short time. COVID19 is mainly responsible for acute respiratory syndrome however, there are reports of involvement of some neurological symptoms and conditions wise; headache, dizziness, fatigue, insomnia, confusion and myalgia, encephalitis etc. The severe neurological effects consist of acute ischemic stroke, cerebral hemorrhage, cerebral venous sinus thrombosis, subarachnoid hemorrhage, acute necrotizing hemorrhagic encephalopathy, meningitis/encephalitis, and acute Guillain-Barre Syndrome. Neurological conditions could be due to the entrance of the virus into the brain via nasal passage through the olfactory bulb or the initiation of a storm of cytokines that cross the blood-brain barrier (BBB). It can also have a long-term effect in the form of demyelination of neurons which can lead ...

Electrochimica Acta, 2019

Platinum-free counter electrodes are crucial for developing cost effective solar energy harvestin... more Platinum-free counter electrodes are crucial for developing cost effective solar energy harvesting technology. We describe here the fabrication of efficient platinum free FTO counter electrodes for dye sensitized solar cells based on pristine polyaniline, polyaniline doped with sulfuric acid, ammonuim lauryl sulfate, as well as binary doped with sulfuric acid and ammonium lauryl sulphate. The characteristics of these counter electrodes were analyzed using cyclic voltammetry, photocurrent density evoltage and electrochemical impedance spectroscopy measurements. At optimized fabrication conditions, the counter electrode shows significantly high photoelectric conversion efficiency of 4.54% compared to 4.03% for reference platinum counter electrode. Charge transfer resistance at the interface between electrolyte and counter-electrode is also decreased for the optimized polyaniline based counter electrode. Furthermore, the device presented characteristics of multiple start/stop ability and fast activity. The simple preparation procedure, low cost and improved photoelectric properties permit fabricated counter electrode to be a reliable alternative for dye sensitized solar cells.

Advances in Polymer Technology, 2018

In the last two decades, conducting polymers have progressively acquired distinguished position a... more In the last two decades, conducting polymers have progressively acquired distinguished position among synthetic materials possibly due to their importance from fundamental and technological point of view. [1] One of the most promising and mostly studied conducting polymers is polyaniline (PANI). The established scientific rules provide with a scope for regulation of PANI properties for potential applications in diverse fields. [2,3] However, PANI is inherently brittle and poorly processible due to insoluble nature. [4] To overcome these difficulties, researchers have directed their attention to modify the structure of PANI, for example, via post treatment of PANI such as (a) use of functional dopants, (b) sulfonation, (c) polymerization of aniline in the presence or inside a polymer matrix, self-doping polymer, and blending methods.

Synthetic Metals, 2014

We report on the synthesis of poly(o-toluidine) (POT), a methyl-substituted derivative of PANI, b... more We report on the synthesis of poly(o-toluidine) (POT), a methyl-substituted derivative of PANI, by inverse emulsion polymerization. A mixture of 2-butanol and chloroform was used as dispersion medium; benzoyl peroxide as oxidant, while dodecylbenzenesulfonic acid (DBSA) was used both as dopant and as surfactant. POT was collected in its salt form and was found to be completely soluble in various organic solvents (so far highest number of solvents) such as DMSO, chloroform, toluene, THF, acetonitrile and ethanol. The synthesized polymer was characterized by cyclic voltammetry, in situ UV-Vis spectroelectrochemistry, viscosity and in situ conductance measurements, FTIR and TGA. Conductance measurements show that POT has high conductance comparable with that of electrochemically synthesized POT. The POT film dip-coated on a gold electrode was highly stable in air; no appreciable decrease in the electrochemical activity of the film occurred even when left open for 14 days in air. Thermal analysis reveals a very good thermal stability up to 513 • C. Potentiodynamic polarization measurements show that POT acts as a highly efficient corrosion protection layer on steel with 77% protection efficiency.

University of Peshawar, Peshawar., 2020

Electrochimica Acta, 2021

Microbial electrosynthesis (MES) is a promising technology to convert CO2 into value-added chemic... more Microbial electrosynthesis (MES) is a promising technology to convert CO2 into value-added chemicals. Enhancing the interactions between biofilms and electrodes is the key of bioelectrochemical systems (BES). In this work, we studied the conversion of CO2 by MES in reactors equipped with novel gas diffusion electrodes (GDEs) modified with a polyaniline (PANI) polymer binary doped with H2SO4 and ammonium lauryl sulfate. The enhanced conductive and hydrophilic properties of the polymer increased the biocompatibility of the PANI-modified GDEs compared to the non-modified carbon GDEs. This increased biocompatibility resulted in faster start-up and higher bioproduction of volatile fatty acids (VFAs) such as acetate and butyrate. Up to 4400 ppm acetate was produced in PANI-modified reactors after 24 days of operation, compared to 408 ppm in reactors equipped with non-modified GDEs. A maximum acetate concentration of 7500 ppm (production rate of 554.8 ± 267.5 ppm day−1) was reached in reac...

The performance of high-rate supercapacitors requires fine morphological and electrical propertie... more The performance of high-rate supercapacitors requires fine morphological and electrical properties of the electrode. Polyaniline (PANI), as one of the most promising materials for energy storage, shows different behaviour on different substrates. The present study reports on the surface modification of fluorine doped tin oxide (FTO) with the sodium phytate doped PANI without any binder and its utilization as a novel current collector in symmetric supercapacitor devices. The electrochemical behaviour of the sodium phytate doped PANI thin film with and without a binder on fluorine doped tin oxide (FTO) as current collector was investigated by cyclic voltammetry (CV). The electrode without a binder showed higher electrocatalytic efficiency. A symmetrical cell configuration was therefore constructed with the binder-free electrodes. The device showed excellent electrochemical performance with high specific capacities of 550 Fg−1 at 1 Ag−1 and 355 Fg−1 at 40 Ag−1 calculated from galvanost...

Electrochemical Science Advances