Ismariza Ismail
Thumbnail Image
Preferred name
Ismariza Ismail
Official Name
Ismail, Ismariza
Alternative Name
Ismail, I.
Ismail, Ismariza
Main Affiliation
Scopus Author ID
57203013485
Researcher ID
GTH-8854-2022

Research Output
Now showing 1 - 3 of 3
  • Publication
    La₀.₆Sr₀.₄Co₀.₂Fe₀.₈O₃−δ powder: a simple microstructure modification strategy for enhanced cathode electrochemical performance
    (Springer, 2020)
    Ismariza Ismail
    ;
    Nafisah Osman
    ;
    Abdul Mutalib Md Jani
    A simple strategy of producing well-dispersed La₀.₆Sr₀.₄Co₀.₂Fe₀.₈O₃−δ (LSCF) cathode nanopowders that utilizes a dispersing agent is presented. The cathode nanopowder was synthesized by employing a dispersing agent-assisted sol–gel method. Two types of dispersing agents were applied as the synthesizing aids in this study which are the activated carbon (AC) and ethylene glycol (EG). The synthesized cathode powder was systematically characterized by X-ray diffraction (XRD), thermogravimetric analyzer (TGA), field emission scanning electron microscopy (FESEM), and BET surface area analyzer. The electrochemical properties of the fabricated cell were evaluated using electrochemical impedance spectroscopy (EIS). TGA analysis shows that both dispersing agents decomposed below 600 °C. The XRD analysis demonstrates that the single-phase LSCF perovskite is attainable at the calcination temperature of 700 °C for 5 h. FESEM results are in accordance with the BET analysis in which application of the dispersing agents produced more dispersed cathode powders and larger surface area. The electrochemical performances of the LSCF cathode modified with the AC and EG are respectively in the average of six- and eightfolds higher as compared with the pristine LSCF. The dispersing reaction of AC and EG and their influences on the cathode microstructure and performance are also thoroughly discussed.
  • Publication
    Banana stem waste as a sustainable modifier for microstructure modification of protonic ceramic fuel cell cathode
    ( 2024-06)
    Ismariza Ismail
    ;
    Muhammad Mahyiddin Ramli
    ;
    Norizah Abd Karim
    ;
    Abdullah Abdul Samat
    This study investigates the feasibility of utilizing banana stem waste (BSW) as a pore former to modify the microstructure of the PCFC composite cathode. The microstructure of the La₀.₆Sr₀.₄Co₀.2Fe₀.8O3-α-Ba(Ce₀.₆Zr₀.₄)₀.₉Y₀.1O3-δ (LSCF-BCZY64) composite cathode was modified by varying the amounts of the incorporated banana stem waste. The samples underwent sintering at 1000 ˚C, and their microstructural and physical properties were analyzed using X-ray diffraction, scanning electron microscopy, and densimeter. The results indicate that the incorporation of BSW enhances the porosity of the cathode without significantly affecting its crystalline structure. As the amount of BSW increased from 10 to 40 wt.%, the porosity level increased from 7.0% to 32.7%, and the density of the samples decreased from 1.3 to 0.9 g/cm3, thereby supporting the results of the porosity analysis. Increased cathode porosity can enhance reactant accessibility to active sites, potentially resulting in improved cell performance and durability. Moreover, the utilization of BSW as a sustainable and cost-effective pore former aligns with the growing emphasis on environmentally friendly materials in energy applications.
      12  1