Many researchers have studied on perovskite oxide for its unique structure.Perovskite oxides,ABO3-δ,with different A and B metals have shown wide applications in many fields,in particular solid oxide electrolysers.Sr...Many researchers have studied on perovskite oxide for its unique structure.Perovskite oxides,ABO3-δ,with different A and B metals have shown wide applications in many fields,in particular solid oxide electrolysers.SrFeO3-δ,typical perovskite oxides,in which iron is the mixed-valence cation with the capacity to change the chemical valence,have a wide range of oxygen nonstoichiometry.In this study,Sr（0.9）Fe（0.9）Zr（0.1）O3-δ（SFZO） is synthesized and then treated in 5%H2/Ar and air at high temperature,exhibiting excellent redox stability.Redox-stable structure,oxygen vacancy and electrical properties of SFZO are investigated.Steam electrolysis is then performed with SFZO cathode under 5%H2O/5%H2/Ar and 5%H2O/Ar atmospheres,respectively.The present results indicate that the SFZO is a novel promising cathode material for solid oxide steam electrolyser.展开更多
A precursor of BaCe 0.9 Nd 0.1 O 3-δ solid electrolyte was synthesized by the sol-gel method and sintered at14 00℃.The obtained gels and powder were characterized by differential and ther mogravimetric thermal analy...A precursor of BaCe 0.9 Nd 0.1 O 3-δ solid electrolyte was synthesized by the sol-gel method and sintered at14 00℃.The obtained gels and powder were characterized by differential and ther mogravimetric thermal analysis(TG-DTA),X-ray diffraction(XRD),transmissi on electron microscopy(TEM).Using the sintered samples as solid electrolyte a nd silver-palladium alloy as electrodes,electrical conductivities under differ ent gas ambiences at intermediate temperature(400～600℃)were measured. In moist hydrogen atmosphere,the conduction is a little higher than that of dry hydrogen atmosphere.In hydrogen atmosphere,proton conduction may predominate ,leading to an increase in conductivity and a decrease in activation energy.展开更多
NiO-La0.3Ce0.7O2-δ(LDC30) novel anode was investigated for IT-SOFCs(Intermediate Temperature-Solid Oxide Fuel Cells) with LaGaO3-based electrolyte. The results showed that LDC30 has a suitable chemical compatibility ...NiO-La0.3Ce0.7O2-δ(LDC30) novel anode was investigated for IT-SOFCs(Intermediate Temperature-Solid Oxide Fuel Cells) with LaGaO3-based electrolyte. The results showed that LDC30 has a suitable chemical compatibility with NiO and NiO-LDC30 has a good thermal expansion matching with LDC30 interlayer and LSGM(La0.8Sr0.2Ga0.8Mg0.2O3-δ) electrolyte, so NiO-LDC30/LDC30 was considered as a feasible and novel anode system. It was also shown that NiO content plays a key role on polarization performance and morphology of the anode. When the content of NiO was 60%(mass fraction), the polarization loss of anode was the lowest. Next we will optimize the porosity and sintering procedure to modify the microstructure and performance of the anode.展开更多
通过甘氨酸硝酸盐法（GNP）合成了钙钛矿型Ba0.5Sr0.5Co0.8Fe0.2O3-δ（BSCF）复合氧化物粉体。经压制、烧结后,得到了BSCF烧结体试样,还通过硝酸溶液浸蚀处理对烧结体试样进行了表面浸蚀处理。采用X射线衍射仪（XRD）对煅烧后的粉体进...通过甘氨酸硝酸盐法（GNP）合成了钙钛矿型Ba0.5Sr0.5Co0.8Fe0.2O3-δ（BSCF）复合氧化物粉体。经压制、烧结后,得到了BSCF烧结体试样,还通过硝酸溶液浸蚀处理对烧结体试样进行了表面浸蚀处理。采用X射线衍射仪（XRD）对煅烧后的粉体进行了相成分分析;采用扫描电子显微镜（SEM）及能谱仪（EDS）对烧结体和表面浸蚀后烧结体样品的微观组织和成分进行了表征;对烧结体的致密度、电导率进行了测试分析,并在自制的氧渗透装置上测定了BSCF钙钛矿膜的透氧量,分析了温度和不同氧分压差等对膜透氧性能的影响。实验结果表明,甘氨酸-硝酸盐法所制备的前驱体粉末在900℃煅烧3 h后可获得具有单一钙钛矿结构的BSCF粉体,1100℃煅烧的BSCF烧结体的电导率在600℃时最大达到38.15 S·cm-1。其透氧量随着温度和氧分压差的升高而增大,且硝酸表面浸蚀处理后,BSCF膜片的透氧性能有明显提高,透氧速率提高1.6~4.5倍。850℃,20%O2-80%N2混合气体/He条件下,浸蚀后的透氧膜片的透氧量达到2.36 m L/cm2·min,而未浸蚀透氧膜片的透氧量仅为1.36 m L/cm2·min。展开更多
基金Supported by the Natural Science Foundation of Guangdong Province （030514） and the Science and Technology Program of Guangdong Province （2004B33401006）.
文摘有 SrFe_(0.6 )Cu_(0.3 )Ti_(0.1 )O_ 的作文的稠密的膜(3- δ)(SFCTO ) 被固态反应法方法准备。通过这膜的氧浸透流动在操作温度从 750 °C 到部分 pressure.XRD 大小显示了的 950 °C 和不同的氧被调查混合物能形成在哪个缺酸料液分开的 single-phased perovskite 结构，这被 Cu 和 Ti.The 氧解吸附作用和 SFCTO 的催化剂的可还原性代替粉末被描绘由 thermogravimetric ，分析和温度规划了减小分析， respectively.It 被发现那 SFCTO 有在在高温的低氧压力下面的好结构稳定性。Ti 的增加增加了 Cu 的减小温度， Fe.Performance 测试证明通过厚 SFCTO 膜是的 1.5 公里的氧浸透流动 _(0.3 ) 5-0.96 ml · m in^( 在有 53.2 kJ · m ol^ 的激活精力的空气 / 氦氧分压梯度下面的 -1) · cm^(-2)(-1) 。85% 的甲烷变换， 90% 的公司选择和 5 ml · m in~ 的比较地更高的氧浸透流动(-1)cm^(-2) 在 850 ° C 被完成，一个 SFCTO 膜反应堆什么时候与 Ni-Ce/Al2O3 催化剂装载了，被申请到 syngas 的甲烷的部分氧化。
基金Supported by the National Natural Science Foundation of China(91545123)and the Natural Science Foundation of Fujian Province(2016J01275)
文摘Many researchers have studied on perovskite oxide for its unique structure.Perovskite oxides,ABO3-δ,with different A and B metals have shown wide applications in many fields,in particular solid oxide electrolysers.SrFeO3-δ,typical perovskite oxides,in which iron is the mixed-valence cation with the capacity to change the chemical valence,have a wide range of oxygen nonstoichiometry.In this study,Sr（0.9）Fe（0.9）Zr（0.1）O3-δ（SFZO） is synthesized and then treated in 5%H2/Ar and air at high temperature,exhibiting excellent redox stability.Redox-stable structure,oxygen vacancy and electrical properties of SFZO are investigated.Steam electrolysis is then performed with SFZO cathode under 5%H2O/5%H2/Ar and 5%H2O/Ar atmospheres,respectively.The present results indicate that the SFZO is a novel promising cathode material for solid oxide steam electrolyser.
文摘A precursor of BaCe 0.9 Nd 0.1 O 3-δ solid electrolyte was synthesized by the sol-gel method and sintered at14 00℃.The obtained gels and powder were characterized by differential and ther mogravimetric thermal analysis(TG-DTA),X-ray diffraction(XRD),transmissi on electron microscopy(TEM).Using the sintered samples as solid electrolyte a nd silver-palladium alloy as electrodes,electrical conductivities under differ ent gas ambiences at intermediate temperature(400～600℃)were measured. In moist hydrogen atmosphere,the conduction is a little higher than that of dry hydrogen atmosphere.In hydrogen atmosphere,proton conduction may predominate ,leading to an increase in conductivity and a decrease in activation energy.
文摘NiO-La0.3Ce0.7O2-δ(LDC30) novel anode was investigated for IT-SOFCs(Intermediate Temperature-Solid Oxide Fuel Cells) with LaGaO3-based electrolyte. The results showed that LDC30 has a suitable chemical compatibility with NiO and NiO-LDC30 has a good thermal expansion matching with LDC30 interlayer and LSGM(La0.8Sr0.2Ga0.8Mg0.2O3-δ) electrolyte, so NiO-LDC30/LDC30 was considered as a feasible and novel anode system. It was also shown that NiO content plays a key role on polarization performance and morphology of the anode. When the content of NiO was 60%(mass fraction), the polarization loss of anode was the lowest. Next we will optimize the porosity and sintering procedure to modify the microstructure and performance of the anode.
文摘通过甘氨酸硝酸盐法（GNP）合成了钙钛矿型Ba0.5Sr0.5Co0.8Fe0.2O3-δ（BSCF）复合氧化物粉体。经压制、烧结后,得到了BSCF烧结体试样,还通过硝酸溶液浸蚀处理对烧结体试样进行了表面浸蚀处理。采用X射线衍射仪（XRD）对煅烧后的粉体进行了相成分分析;采用扫描电子显微镜（SEM）及能谱仪（EDS）对烧结体和表面浸蚀后烧结体样品的微观组织和成分进行了表征;对烧结体的致密度、电导率进行了测试分析,并在自制的氧渗透装置上测定了BSCF钙钛矿膜的透氧量,分析了温度和不同氧分压差等对膜透氧性能的影响。实验结果表明,甘氨酸-硝酸盐法所制备的前驱体粉末在900℃煅烧3 h后可获得具有单一钙钛矿结构的BSCF粉体,1100℃煅烧的BSCF烧结体的电导率在600℃时最大达到38.15 S·cm-1。其透氧量随着温度和氧分压差的升高而增大,且硝酸表面浸蚀处理后,BSCF膜片的透氧性能有明显提高,透氧速率提高1.6~4.5倍。850℃,20%O2-80%N2混合气体/He条件下,浸蚀后的透氧膜片的透氧量达到2.36 m L/cm2·min,而未浸蚀透氧膜片的透氧量仅为1.36 m L/cm2·min。
