甘氨酸-硝酸盐法制备NiO-Sm掺杂CeO_2复合阳极粉末研究

Synthesis of NiO-SDC Composite Powders for Anode by Glycine-Nitrate Process

采用甘氨酸-硝酸盐燃烧法合成了中温固体氧化物燃料电池NiO-SDC复合阳极粉末。通过XRD和扫描电子显微镜对不同甘氨酸/金属离子摩尔比合成的复合粉末的结构和形貌进行了研究。XRD结果表明,直接燃烧合成的复合粉末除了NiO和CeO2的衍射峰外,还有Ni2O3衍射峰存在,粉末经900℃煅烧2h后Ni2O3峰消失,表明形成了NiO-SDC复合阳极粉末。氢气条件下的热重分析表明,复合粉末中NiO和SDC两相比例与溶液组分配比基本一致。制备的不同NiO含量薄膜阳极的电解质支撑单电池性能测试结果表明,阳极为60%NiO-SDC的单电池具有最高的开路电压。

NiO-SDC （samaria-doped ceria） composite powder synthesized by giycine-nitrate process was used as the anode material the the solid oxide fuel cells of medium-temperature. The phase composition and morphology of NiO-SDC powders synthesized with different molar ration of glycine and metal were investigated by XRD and SEM. The XRD results show that the composite powders obtained directly from glycthe-onitrate process contain NiO phase and CeO2 phase as well as Ni2O3 phase, then the NiO-SDC composite powders can be obtained by following a calcination at 900℃ for 2 h due to the Ni2O3 decomposition into NiO. Thermogravimetric analysis in hydrogen shows that the ratio of NiO to SDC of NiO-SDC composite powder is in accordance with solution composition. The electrolyte-supported single ceils with different NiO content anodes have been tested in order to investigate the effect of NiO content on the performance of electrodes made of NiO-SDC cermets. The results show thai the single cell with an anode of 60%NiO-SDC composition exhibits the maximum open circuit voltage.