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Sökning: WFRF:(Akhtar Majid Niaz)

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1.
  • Hussain, Jawad, et al. (författare)
  • Modeling and simulation of planar SOFC to study the electrochemical properties
  • 2020
  • Ingår i: Current applied physics. - : ELSEVIER. - 1567-1739 .- 1878-1675. ; 20:5, s. 660-672
  • Tidskriftsartikel (refereegranskat)abstract
    • In this paper, modeling and simulations are carried out using COMSOL Multiphysics. A three-dimensional model is developed for a planar intermediate temperature (IT) solid oxide fuel cell (SOFC). A parametric study has been carried out to analyze the performance of SOFC. Simulations reveal some promising features and enhanced performance of SOFC. It is shown that the maximum value of power (4-3.3) kW/m(2) still remains higher with significant rise of temperature (600 degrees C-1000 degrees C), nearly 0.15 kW/m(2) is the very small loss of power per 100 degrees C rise of temperature. Results have shown that the electrolytic current density is (6700-5500) A/m(2) for peak value of power (4-3.3) kW/m(2) with increase of temperature (600 degrees C-1000 degrees C). For model validation we have plotted a comparison of average current density.
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2.
  • Yousaf, Muhammad, et al. (författare)
  • Electrochemical properties of Ni0.4Zn0.6 Fe2O4 and the heterostructure composites (Ni-Zn ferrite-SDC) for low temperature solid oxide fuel cell (LT-SOFC)
  • 2020
  • Ingår i: Electrochimica Acta. - : PERGAMON-ELSEVIER SCIENCE LTD. - 0013-4686 .- 1873-3859. ; 331
  • Tidskriftsartikel (refereegranskat)abstract
    • In solid oxide fuel cell, the redox reactions (HOR and ORR) demand good catalyst functions at the anode and cathode. Triple phase boundary (TPB) is an important mechanism to determine HOR and ORR as key factors to improve the reaction rate, charge transfer and ion diffusion processes. In the present work, Ni0.4Zn0.6Fe2O4 (Ni-Zn ferrite) and its heterostructures with Sm0.2Ce0.8O2 (SDC) are prepared and characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) to analyze the phase structure and morphology of the material. X-ray photoelectron spectroscopy (XPS) confirms the phase of Ni-Zn ferrite nanoparticles (NPs) and chemical states on the heterostructure surface. The electrical and conductive behaviors of synthesized samples are investigated through electrochemical impedance spectroscopy (EIS) and fuel cell measurements. Unlike to conventional way, the as-prepared samples promote redox reactions from two aspects: a) as an electrolyte for ion transport; b) as a mixed conductor to extend the ionic transport on TPB region. The ionic transfer mechanism of Ni-Zn ferrite/SDC composite leads the improved fuel cell performance up to 760 mW/cm(2) at 550 degrees C. Further investigations verify the appreciable proton conduction in the prepared devices in a range of 0.012-0.048 Scm(-1).
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  • Resultat 1-2 av 2
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tidskriftsartikel (2)
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refereegranskat (2)
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Akhtar, Majid Niaz (2)
Raza, Rizwan (1)
Zhu, Bin (1)
Afzal, Muhammad (1)
Wang, Baoyuan (1)
Yousaf, Muhammad (1)
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Mushtaq, Naveed (1)
Ali, Rashid (1)
Hussain, Jawad (1)
Jaffery, Mujtaba Hus ... (1)
Shakir, Imran (1)
Noor, Asma (1)
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Kungliga Tekniska Högskolan (2)
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Engelska (2)
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2020 (2)

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