Abstract
Ceria-based Al2O3 composite electrolytes were prepared using (CeO2)0.6(SmO1.5)0.2(GdO1.5)0.2 (C6S2G2) and Al2O3 powders, employing sol-gel and low temperature combustion synthesis methods (SGLCS). The influence of Al2O3 content on the sintering behavior and electrical properties was studied. The results showed that electrical properties could be improved by adding 10wt% Al2O3. The sintered density was up to 5.61g/cm3. Most measurements of open circuit voltage (OCV) ranged between 0.8 and 1.2V; an OCV value of 1.15V was obtained at 370oC. The performance of intermediate- temperature solid oxide fuel cells (ITSOFCs) with a properly Al2O3 doped electrolyte was better than when a pure ceria-based one was used. The highest power density was 200mWcm-2.
Highlights
Solid oxide fuel cells (SOFCs) have attracted considerable research interest because of their many advantages as energy conversion devices
Most conventional SOFCs use yttriastabilized zirconia (YSZ) as an electrolyte and operate at high temperatures around 1000oC A high operating temperature brings about such disadvantages as poor stability in the long-term and component manufacturing costs, etc
The purpose of this paper is to study the effects of alumina on the performance of sintering and electrical properties of ceria-based electrolytes in the intermediate temperature (500oC) working range
Summary
Solid oxide fuel cells (SOFCs) have attracted considerable research interest because of their many advantages as energy conversion devices. One of the most promising methods to reduce the working temperature for SOFCs is to replace YSZ with other electrolytes possessing high oxide ion conductivity at low temperature. Ceria doped with a rare-earth oxide is a potential electrolyte for so called intermediate-temperature SOFCs because of their higher oxide ion conductivity at relatively lower temperatures than YSZ [1,2,3,4,5,6,7,8,9]. Inorganic solid compounds, working as electrolytes with protons, can make fuel cells operating at lower temperatures [10,11,12]. Samarium nitrate and gadolinium nitrate were used as starting materials They were mixed together with a citric acid solution. With the evaporation of water, a yellow sponge-like gel was obtained, and the gel was placed in a 130oC drying oven, where the gel underwent a self-igniting reaction at 260oC and became a light yellow powder with an average particle size of 30nm
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