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Träfflista för sökning "WFRF:(Raza Rizwan) ;pers:(Akram Nadeem)"

Sökning: WFRF:(Raza Rizwan) > Akram Nadeem

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1.
  • Ahmad, Muhammad Ashfaq, et al. (författare)
  • Structural and electrical characterisation of nanostructure electrodes for SOFCs
  • 2014
  • Ingår i: International journal of hydrogen energy. - : Elsevier BV. - 0360-3199 .- 1879-3487. ; 39:30, s. 17487-17491
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper reports the effects of sintering temperature on structure, particle size and conductivity of electrodes (Sn0.2Zn0.8Fe0.2O & Sn0.8Zn0.2Fe0.2O). The electrode material was prepared by the chemical method combining a solid state reaction. Structural analyses were performed using X-ray diffraction and scanning electron microscopy. The particle size of the material obtained using Scherrer's formula was 50-60 nm and the nanostructure's surface was studied using electrochemical characterisations tools. Electrical conductivity was determined using the 4-probe DC method, which was compared with the 4-probe AC method. These results suggest a promising substitute for the conventional electrodes of solid oxide fuel cells (SOFCs). It is known that a sintering temperature above 1000 degrees C causes an increase in density and a reduction of porosity. Therefore, we optimised the sintering temperature at 1000 degrees C and obtained electrical conductivity of about 5 S Thus, this electrode could play a vital role in the development of high performance SOFCs at intermediate temperatures.
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2.
  • Rafique, Asia, et al. (författare)
  • Significance enhancement in the conductivity of core shell nanocomposite electrolytes
  • 2015
  • Ingår i: RSC Advances. - : Royal Society of Chemistry. - 2046-2069. ; 5:105, s. 86322-86329
  • Tidskriftsartikel (refereegranskat)abstract
    • Today, there is great demand of electrolytes with high ionic conductivities at low operating temperatures for solid-oxide fuel cells. Therefore, a co-doped technique was used to synthesize a highly ionically conductive two phase nanocomposite electrolyte Sr/Sm-ceria-carbonate by a co-precipitation method. A significant increase in conductivity was measured in this co-doped Sr/Sm-ceria-carbonate electrolyte at 550 degrees C as compared to the more commonly studied samarium doped ceria. The fuel cell power density was 900 mW cm(-2) at low temperature (400-580 degrees C). The composite electrolyte was found to have homogenous morphology with a core-shell structure using SEM and TEM. The two phase core-shell structure was confirmed using XRD analysis. The crystallite size was found to be 30-60 nm and is in good agreement with the SEM analysis. The thermal analysis was determined with DSC. The enhancement in conductivity is due to two effects; co-doping of Sr in samarium doped ceria and it's composite with carbonate which is responsible for the core-shell structure. This co-doped approach with the second phase gives promise in addressing the challenge to lower the operating temperature of solid oxide fuel cells (SOFC).
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  • Resultat 1-2 av 2
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Raza, Rizwan (2)
Akram, Nadeem (2)Ta bort avgränsningen
Khan, M. Ajmal (1)
Zhu, Bin (1)
Ahmad, Muhammad Ashf ... (1)
Rafique, Asia (1)
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Ali, Amjad (1)
Ullah, M. Kaleem (1)
Dawson, Richard (1)
Irshad, Muneeb (1)
Siraj, Khurram (1)
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