燃料电池的质子导电氧化物电解质.ppt

A Stable, Easily Sintered Proton-Conducting Oxide Electrolyte forModerate-Temperature Fuel Cells and Electrolyzers 组员： 饶媛媛 S郭宏艳 S李红举 S 何星伟 S 赛青林 S 2008、12、30 content Introduce of SOFC The mechanism of the SOFC-H+ Experimental section Conclusions Application Traditional Fuel SOFC Lower conversion efficient higher pollution complex process huge facility located in remote areas need a lot of transmission device Higher conversion efficient non-pollution simple process independent instrument small volume Two type of SOFC The history of SOFC-H+ solid solutions of BaCeO3 and BaZrO3 combined the high proton conductivity of barium cerate with the good chemical stability of barium zirconate . However, it is difficult to get high density of zirconate and high sintering temperatures are always needed. More importantly, the electrolyte show unstability in CO2 atmosphere In order to solve these problems, doped other elements into BaCeO3 The advantages of SOFC-H+ The conversion of chemical energy directly to electrical energy in fuel cells Solid state - safe - long span Fuel stability High OCV ,does’t exist electronic conductivity High proton conductivity The mechanism of SOFC-H+ The electrolyte form a single perovskite phase with a cubic unit cell, when adulterated ,it will exist oxide pole .under humid condition H2O+OOX+VO..=2OHO. ? H2+OOX = OHO. +e Synthesis of electrolyte Experimental sectionpechini Fig 1 XRD patterns for perovskite at 1400 ?C modified pechini XRD (different temperature) Fig 2 shows the XRD patterns of powders before and after (B) exposing to CO2 atmosphere at 1200 ?C. The XRD patterns before (A) and after (B) treated in CO2 atmosphere were almost identical to eachother, showing relative stability against carbon dioxide SEM micrographs of cell after testing: (a) the surface of electrolyte and (b) the cross-section of cell with a 30μm thick BCZYZn membr