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
The Ce0.7Zr0.3O2 solid solution and CeO2 were prepared using the sol-gel method. The phase structure, crystallite sizes and the reducibility of the catalysts were characterized by XRD and H2-TPR techniques. XRD result...The Ce0.7Zr0.3O2 solid solution and CeO2 were prepared using the sol-gel method. The phase structure, crystallite sizes and the reducibility of the catalysts were characterized by XRD and H2-TPR techniques. XRD results indicated that Zr^4＋ had replaced part of Ce^4＋ to form a fluorite-like solid solution, which was favorable to obtain ultrafine nanoparticles. The ratio of main HE consumption for Ce0.7Zr0.3O2：CeO2 was 4.4：1.0, implying that the solid solution could improve the reducibility compared to the single CeO2. The Ce0.7Zr0.3O2 solid solution catalyst showed a sharp combustion peak at 397 ℃, which was 200 ℃ lower than that of the single soot. The good catalytic activity of the Ce0.7Zr0.3O2 was attributed to the formation of nano-CeO2-based solid solution, which enhanced the reducibility and then improved the combustion activity. As Ce0.7Zr0.3O2 could be easily reduced to Ce0.7Zr0.3O2-x meanwhile, after oxygenation, the Ce0.7Zr0.3O2.x was recovered to Ce0.7Zr0.3O2 completely. A catalytic combustion reaction mechanism was proposed： the Ce0.7Zr0.3O2 was reduced to Ce0.7Zr0.3O2-x by the reaction with carbon and then it was recovered to Ce0.7Zr0.3O2-x by the interaction with O2.展开更多
To increase the critical thickness of CeO2 single buffer layer, the polymer assisted chemical solution deposition (PACSD) approach has been adopted to prepare a single buffer layer of Gd0.3Ce0.7O1.85-x (GCO) on bi-axi...To increase the critical thickness of CeO2 single buffer layer, the polymer assisted chemical solution deposition (PACSD) approach has been adopted to prepare a single buffer layer of Gd0.3Ce0.7O1.85-x (GCO) on bi-axially textured Ni-5%W alloy substrate, and the influences of different annealing temperatures on texture and microstructure of the buffer layer has also been studied in this paper. The results demonstrate that a well textured, dense and smooth GCO single buffer layer with thickness of 180 nm has been obtained at 1100 ℃ annealing treatment. GdBa2Cu3O7-y (GBCO) film has been deposited on GCO buffered substrate via the similar approach, which is also well textured, dense and smooth. All these show that preparation of GCO buffer layer by PACSD method is an effective approach to prepare single buffer layer for large scale production.展开更多
Perovskite-type oxides La_(0.7)Ce_(0.3)Ni_(0.7)Fe_(0.3)O_3(LCNF) were synthesized by polystyrene colloidal crystal templating(LCNF-CCT) and polystyrene polymer templating(LCNF-PS) through co-precipitation. The structu...Perovskite-type oxides La_(0.7)Ce_(0.3)Ni_(0.7)Fe_(0.3)O_3(LCNF) were synthesized by polystyrene colloidal crystal templating(LCNF-CCT) and polystyrene polymer templating(LCNF-PS) through co-precipitation. The structure and physicochemical properties of the obtained oxides were investigated by scanning electron microscopy, X-ray diffraction, N_2 adsorption-desorption, Fourier transform infrared spectrometry, H_2 temperature-programmed reduction and H_2 temperature-programmed desorption, as well as X-ray photoelectron spectroscopy. The results show that the as-synthesized LCNF-CCT perovskite possesses large specific surface area and regular pore size distribution. In addition, the formation of additional oxygen vacancies on the surface favors the migration of lattice oxygen from the bulk phase to the surface and production of more metallic sites, thus improving the activity and resistance to carbon deposition of catalysts in ethanol steam reforming reaction.展开更多
Sm_2(Zr_(0.7)Ce_(0.3))_2O_7是一种三元稀土氧化物材料,具有耐腐蚀性能好、熔点高、热导率低、热稳定性良好等优点,在热障涂层领域有着潜在的应用前景.以Sm_2O_3,ZrOCl_2·8H_2O和Ce(NO_3)3·6H_2O为原材料,通过水热合成法制备...Sm_2(Zr_(0.7)Ce_(0.3))_2O_7是一种三元稀土氧化物材料,具有耐腐蚀性能好、熔点高、热导率低、热稳定性良好等优点,在热障涂层领域有着潜在的应用前景.以Sm_2O_3,ZrOCl_2·8H_2O和Ce(NO_3)3·6H_2O为原材料,通过水热合成法制备了Sm_2(Zr_(0.7)Ce_(0.3))_2O_7是纳米材料,并与同样方法制备的Sm_2Zr_2O_7的相关性能进行了对比.通过TG-DSC、XRD、Raman、SEM等测试手段对材料的热行为、相结构、晶粒尺寸和形貌等参数进行了表征.结果表明:Sm_2(Zr_(0.7)Ce_(0.3))_2O_7纳米材料在高温热处理后为烧绿石结构,初始样品的晶粒尺寸为5.43 nm,比表面积为103.11 m2g^(-1).同时对热导率、热膨胀系数等热物性能进行了研究,其热导率为1.04 W m^(-1)K^(-1),热膨胀系数为10.86×10^(-6)K^(-1),这些性能均满足热障涂层的标准.与Sm_2Zr_2O_7相比,Sm_2(Zr_(0.7)Ce_(0.3))_2O_7具有更优异的性能,是一种具有广泛应用前景的纳米热障涂层材料.展开更多
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.
基金the Natural Science Foundation of Zhejiang Province (Z404383)
文摘The Ce0.7Zr0.3O2 solid solution and CeO2 were prepared using the sol-gel method. The phase structure, crystallite sizes and the reducibility of the catalysts were characterized by XRD and H2-TPR techniques. XRD results indicated that Zr^4＋ had replaced part of Ce^4＋ to form a fluorite-like solid solution, which was favorable to obtain ultrafine nanoparticles. The ratio of main HE consumption for Ce0.7Zr0.3O2：CeO2 was 4.4：1.0, implying that the solid solution could improve the reducibility compared to the single CeO2. The Ce0.7Zr0.3O2 solid solution catalyst showed a sharp combustion peak at 397 ℃, which was 200 ℃ lower than that of the single soot. The good catalytic activity of the Ce0.7Zr0.3O2 was attributed to the formation of nano-CeO2-based solid solution, which enhanced the reducibility and then improved the combustion activity. As Ce0.7Zr0.3O2 could be easily reduced to Ce0.7Zr0.3O2-x meanwhile, after oxygenation, the Ce0.7Zr0.3O2.x was recovered to Ce0.7Zr0.3O2 completely. A catalytic combustion reaction mechanism was proposed： the Ce0.7Zr0.3O2 was reduced to Ce0.7Zr0.3O2-x by the reaction with carbon and then it was recovered to Ce0.7Zr0.3O2-x by the interaction with O2.
基金Fundamental Research Funds for the Central Universities of China (SWJTU09ZT24, SWJTU09BR153)National Natural Science Foundation of China under (50872116)+1 种基金PCSIRT of the Ministry of Education of China (IRT0751)Specialized Research Fund for the Doctoral Program of Higher Education(200806130023)
文摘To increase the critical thickness of CeO2 single buffer layer, the polymer assisted chemical solution deposition (PACSD) approach has been adopted to prepare a single buffer layer of Gd0.3Ce0.7O1.85-x (GCO) on bi-axially textured Ni-5%W alloy substrate, and the influences of different annealing temperatures on texture and microstructure of the buffer layer has also been studied in this paper. The results demonstrate that a well textured, dense and smooth GCO single buffer layer with thickness of 180 nm has been obtained at 1100 ℃ annealing treatment. GdBa2Cu3O7-y (GBCO) film has been deposited on GCO buffered substrate via the similar approach, which is also well textured, dense and smooth. All these show that preparation of GCO buffer layer by PACSD method is an effective approach to prepare single buffer layer for large scale production.
基金Project supported by Ordinary University Major Project of Guangdong Province,China,(2017KZDXM057)Ordinary University Characteristic Innovation Project of Guangdong Province,China,(2016KTSCX091)
文摘Perovskite-type oxides La_(0.7)Ce_(0.3)Ni_(0.7)Fe_(0.3)O_3(LCNF) were synthesized by polystyrene colloidal crystal templating(LCNF-CCT) and polystyrene polymer templating(LCNF-PS) through co-precipitation. The structure and physicochemical properties of the obtained oxides were investigated by scanning electron microscopy, X-ray diffraction, N_2 adsorption-desorption, Fourier transform infrared spectrometry, H_2 temperature-programmed reduction and H_2 temperature-programmed desorption, as well as X-ray photoelectron spectroscopy. The results show that the as-synthesized LCNF-CCT perovskite possesses large specific surface area and regular pore size distribution. In addition, the formation of additional oxygen vacancies on the surface favors the migration of lattice oxygen from the bulk phase to the surface and production of more metallic sites, thus improving the activity and resistance to carbon deposition of catalysts in ethanol steam reforming reaction.
文摘Sm_2(Zr_(0.7)Ce_(0.3))_2O_7是一种三元稀土氧化物材料,具有耐腐蚀性能好、熔点高、热导率低、热稳定性良好等优点,在热障涂层领域有着潜在的应用前景.以Sm_2O_3,ZrOCl_2·8H_2O和Ce(NO_3)3·6H_2O为原材料,通过水热合成法制备了Sm_2(Zr_(0.7)Ce_(0.3))_2O_7是纳米材料,并与同样方法制备的Sm_2Zr_2O_7的相关性能进行了对比.通过TG-DSC、XRD、Raman、SEM等测试手段对材料的热行为、相结构、晶粒尺寸和形貌等参数进行了表征.结果表明:Sm_2(Zr_(0.7)Ce_(0.3))_2O_7纳米材料在高温热处理后为烧绿石结构,初始样品的晶粒尺寸为5.43 nm,比表面积为103.11 m2g^(-1).同时对热导率、热膨胀系数等热物性能进行了研究,其热导率为1.04 W m^(-1)K^(-1),热膨胀系数为10.86×10^(-6)K^(-1),这些性能均满足热障涂层的标准.与Sm_2Zr_2O_7相比,Sm_2(Zr_(0.7)Ce_(0.3))_2O_7具有更优异的性能,是一种具有广泛应用前景的纳米热障涂层材料.
