• MANOJ GAUTAM

      Articles written in Bulletin of Materials Science

    • Effect of processing route on the properties of LSCF-based composite cathode for IT-SOFC

      AAKASH AHUJA MANOJ GAUTAM AMIT SINHA J SHARMA P K PATRO A VENKATASUBRAMANIAN

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      A novel processing technique was developed to produce an in-situ nano-composite powder based on La$_{0.6}$Sr$_{0.4}$Co$_{0.2}$Fe$_{0.8}$O$_{3-\delta}$ (LSCF6428) and Gd$_{0.1}$Ce$_{0.9}$O$_{1.95}$ (GDC10) for application as cathode material in intermediate temperature solid oxide fuel cells (IT-SOFC). The nano-composite powder was produced using glycine-nitrate solution combustion technique starting from nitrates of six metal ions. The synthesized powder was characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), particle size and BET surface area analyses. XRD analysis of as-produced nano-composite powder confirmed the formation of desired phases right after combustion synthesis. The structural parameters of different phases present in the powders were estimated through Rietveld refinement of XRD data. Tocompare the electrical properties of nano-composite cathode powder produced through the present method, nano-powders of GDC10 and LSCF6428 were individually produced through glycine nitrate process and subsequently mixed through solidstate technique and characterized for functional properties. Using this in-situ nano-composite material, lower polarization resistance was achieved as compared to the LSCF–GDC composite produced from mechanical mixtures of nano-powders of GDC10 and LSCF6428 when used as cathode in GDC10 electrolyte-based symmetrical cell. The effects of cathode layer thickness and electrode firing temperature on the cathodic polarization resistance were studied using in-situ nano-composite cathode powder.

    • Synthesis and characterization of gadolinium-doped ceria and barium cerate-based composite electrolyte material for IT-SOFC

      MANOJ GAUTAM AAKASH AHUJA AMIT SINHA J SHARMA P K PATRO A VENKATASUBRAMANIAN

      More Details Abstract Fulltext PDF

      A nanocomposite, containing gadolinium-doped ceria (GDC, Ce$_{0.85}$Gd$_{0.15}$O$_{1.925}$) and 10 mol% gadoliniumdopedbarium cerate (BGC, BaCe$_{0.85}$Gd$_{0.15}$O$_{2.925}$), was developed as an electrolyte material for intermediate temperature solid oxide fuel cell. The composite powder was synthesized through an auto-combustion process that yielded the desired phases right after combustion. The powder was characterized using X-ray diffraction, particle size analysis, Brunauer–Emmett–Teller surface area analysis and transmission electron microscopy. The electrical properties of the composite electrolyte were characterized by electrochemical impedance spectroscopy under air as a function of temperature. The effect of second phase on total conductivity and activation energy of the composite material was compared with that of GDC of similar composition. For this, GDC (Ce$_{0.85}$Gd$_{0.15}$O$_{1.925}$) powder was produced using a similar processing technique. The microstructural characterization of GDC and GDC–10BGC composite materials was studied through scanning electron microscopy. The electrochemical properties of planar cell, using GDC–10BGC as electrolyte and employing Ni–(GDC–10BGC) and La$_{0.6}$Sr$_{0.4}$Co$_{0.2}$Fe$_{0.8}$O$_{3-\delta}$-based anode and cathode materials, were investigated.

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