Browsing by Author "Dr. Siddique Akhtar Ehsan"

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    Fabrication of 3D Flexible Electrode Derived from Biomass Material for Hybrid Supercapacitor via Electrospinning
    (Library Information Services, COMSATS University Islamabad, Lahore Campus, 2024) Gulnaz; CIIT/SP22-RPH-004/LHR; Dr. Siddique Akhtar Ehsan; LHR TP 8776
    Balsa wood, a naturally occurring material that is renewable and environmentally friendly has undergone delignification protocol. Flexible electrodes play a pivotal role in the development of wearable electronics, enabling conformable and adaptable interfaces for comfortable user interactions and various biomedical applications. Fossil fuels, although once the cornerstone of global energy, now face increasing scrutiny due to their environmental impact, spurring efforts towards cleaner, renewable energy sources and technologies. In this work, nanofibers composites including reduce graphene oxide (rGO), polypyrrole (PPy), and polyvinyl alcohol (PVA) as rGO/PPy are deposited on balsa wood template using an easy, low-cost, and sustainable approach which is the electrospinning technique. Nanofibers composites were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy and electrochemical measurements CV, GCD, EIS done by Corrtest workstation (China). The highest specific capacitance is 52mF/g was obtained at 0.05mA current density. The redox peaks in CV show its hybrid nature so prepared flexible electrode which is derived from balsa wood is suitable and reliable for hybrid supercapacitors.
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    Synthesis of 3D Flexible Electrode of Hybrid Supercapacitor Derived from Biomass via In-Situ Polymerization of Polyaniline a Conducting Polymer
    (Library Information Services, COMSATS University Islamabad, Lahore Campus, 2024) Saman Anwar; CIIT/SP22-RPH-005/LHR; Dr. Siddique Akhtar Ehsan; LHR TP 8777
    Next generation electronics need to be high performance, multifunctional, and environmentally friendly. Here, balsa wood slice was used as a green substrate to the flexible and rechargeable energy storage devices with excellent performance is highly desired due to the demands of potable and wearable devices. This nature derived balsa wood by partial or full removal of lignin without altering or disturbing the hierarchically aligned cellulosic structure is known as delignified wood (DW). We have synthesized a ternary composite electrode comprising balsa wood, graphene oxide, and polyaniline. The properties of the synthesized material were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and Raman spectroscopy. Electrochemical testing revealed that BW/GO/PANI as electrode materials contributes to high areal specific capacitance of 343 mF/cm2 at the current density of 0.5 mA/cm2. Utilizing this BW/GO/PANI as electrodes in a symmetric configuration supercapacitor can result in an outstanding energy density as high as 617 m Wh/cm2 at a power density of 7172 mW/cm2. Therefore, this study provides a promising and efficient way for the preparation of ideal electrode materials for high-performance flexible energy storage devices.