Yazar "Afzal, Tayyaba Tur Rehman" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • [ X ]
    Öğe
    Construction of rectangular microporous Cerium 3D metal organic framework for high performance energy storage devices
    (Academic Press Inc Elsevier Science, 2025) Shahbaz, Muhammad; Sharif, Shahzad; Afzal, Tayyaba Tur Rehman; Shahzad, Sundas; Shahzad, Ayesha; Sahin, Onur; Bentalib, Abdulaziz
    In modern era, there is a dire need to design a hybrid energy storage device showing properties of both supercapacitors and batteries. No doubt, various electrode materials have claimed their efficiency but metal organic frameworks (MOFs) have been focused significantly due to their salient features like high porosity and unique electrochemical properties. In this article, we report cerium-based 3D MOF having rectangular microspore sizes 0.27 x 0.52 nm for rapid and selective transport of charges to be used in hybrid energy storage devices. Structural elucidation was carried out thought single-crystal X-ray diffraction (XRD) spectroscopy and electrochemical attributes were delved via different electroanalytical tools. Three-electrode assembly in 1 M KOH electrolyte unearthed efficiency of the synthesized material and practical applications were divulged through two-electrode assembly by fabricated hybrid device. Diffusive and capacitive contribution of the material was investigated by Dunn's method. The hybrid device showed specific capacityof 101.3 C/g, specific energy of 21.11 Wh/kg and specific power of 1237.78 W/kg with cyclic stability of 99 % even after 5000 GCD cycles. Significant results proved that the material is a prospective contender for futuristic hybrid supercapacitors.
  • [ X ]
    Öğe
    Synergetic interplay of a nitrogen- and sulfur-rich copper bi-linker 2D cubic-layered MOF composite with MXene for improved hybrid supercapacitor application
    (Royal Soc Chemistry, 2025) Saeed, Maham; Sharif, Shahzad; Shah, Javed Hussain; Afzal, Tayyaba Tur Rehman; Shahbaz, Muhammad; Shehzad, Azhar Mehmood; Shahzad, Ayesha
    To combine the properties of batteries and capacitors in a single hybrid device, metal-organic frameworks have emerged as promising materials. In this study, by incorporation of a heteroatom (N, O and S)-based bi-linker, a novel copper-based two-dimensional metal-organic framework (Cu-SIP-MOF), derived from 5-sulfoisophathalic acid monosodium salt (SIP sodium salt) and 4,4-bipyridine was synthesized and characterized using different techniques. The conductivity of the extended 2D MOF was attributed to pi-d orbital contribution, which was further enhanced by fabricating its composite with MXene. The synthesized MOFs and its composites were electrochemically evaluated using different electroanalytical techniques such as cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy via three-electrode assembly. The composites of Cu-SIP-MOF with MXene (CM-200) in a 1 : 2 ratio possessed the highest specific capacity of 683.69 C g-1, highlighting the potential for their practical implementation in asymmetric hybrid devices. The material demonstrated an energy density and a power density of 62 W h kg-1 and 2330.4 W kg-1, respectively. It also expressed 98.3% coulombic efficiency after 5000 galvanic charge-discharge cycles. The significant values of specific capacity, energy density and power density of CM-200 make it a promising electrode material for a futuristic hybrid device.