Study On The Microstructure And Electrical Performance Of SDC/NiO Anode For Solid Oxide Fuel Cell

Solid oxide fuel cells?SOFCs?have been drawing attention because of its high efficiency,'near zero'pollutant emissions and flexible fuel utilization,but their commercialization are still limited by some factors,such as high cost,polarization loss and degradation under long term running.Hence further improvement of the performance SOFCs is necessary,including the improvement of the properties of anode for SOFCs.In this study,the composite Ce_0.8Sm_0.2O_2-??SDC?/Ni O anode was fabricated by dry-pressing and infiltration.Then the sintering kinetics,modification through infiltration method and the pore structure analysis of the SDC/Ni O anode were studied.Chapter One introduces SOFCs and the review of its key materials,fabrication and gas transport of anodes.Chapter Two focuses on the factors that influence the sintering behavior of SDC/Ni O.The influence of the ratio between SDC and Ni O,Cu O sintering aid and pore formers are tested.All of the three factors can control the sintering behavior of anode,and their mechanisms are discussed.Chapter Three studies the anode that fabricated by the infiltration method.The influence of the microstructural of SDC skeleton and the wettability of the infiltrated precursor solution are both investigated.Two kinds of SDC powers synthesized by solid phased method and oxalate co-precipitation method,combined with starch and microcrystalline cellulose as pore former,are used to prepare SDC skeleton with different structure,and their different performances are discussed.The wettability of the precursor solution to the SDC can be improved by adding very small amount of SDBS and SDS.The electronic conductivity,however,has not been improved due to large size of nickle particles yet.Chapter Four focuses on the pore structure and gas transport of anode.A brief and simple method is established to estimate the tortuosity factor of the pore in anode.The tortuosity factor was calculated by the bubble-point method combined with the SEM image analysis.The results showed a well agreement with the references.