Study On Preparations And Performances Of Transition Metal Oxides/SDC-based Anode For ILTSOFC

Conventional solid oxide fuel cell (SOFC) was operated at high temperature, 800~1000℃. The conductivity of electrolyte was improved at high operating temperature, however, selection of cell materials and cell fabrication were strict, resulting in high costs. Direct hydrocarbon fuelled SOFC becomes the focus of interest, where operation with hydrocarbon fuel without external reformer leading to a simple system and high efficiency. A major hurdle for direct hydrocarbon fuelled SOFC technology is carbon formation on anodes, which is still prohibitive for SOFC developing further into the market. The objective of this work is to develop novel anode materials for intermediate and low temperature (ILT, 400~750℃) SOFC. Several aims were achieved as follows:1. Oxides CuO,NiO,CoO and samaria-doped ceria (SDC) were prepared by employing combustion synthesis of nitrate-citrates gel. The effects of citrate acid and combustion temperature on oxides particle size and catalytic activity were discussed. The c/n was select between 1~2 and the gel combustion temperature ranged from 450 to 600℃.2. Transition metal oxides/SDC-based anode materials were prepared combining mechanical milling method. Single cell was fabricated using a uniaxial die-press. The performances of anode materials were valued by directly measuring the single cell. And the component and preparing technology of anode materials were optimized.3. The carbon materials having perfect electronic conductivity and high-temperature oxidation-resistant property were incorporated in MO-SDC to improve electronic conductivity of anode materials. The 0.265W/cm2, 0.25 W/cm2 of power densities were achieved by using NG-MO-SDC anode, respectively operating H2 and methanol.4. The carbon formation and stability of anodes were discussed as direct operating methanol.In the work, the XRD and SEM analysis methods were used to characterize the structures and morphologies of oxide materials, from which the preparation technologies and the heat-treated temperatures were optimized.