Ceria-based electrolytes have been widely researched in intermediate-temperature solid oxide fuel cell （SOFC）, which might be operated at 500-600℃. Sintering behavior with lithium oxide as sintering additive and el...Ceria-based electrolytes have been widely researched in intermediate-temperature solid oxide fuel cell （SOFC）, which might be operated at 500-600℃. Sintering behavior with lithium oxide as sintering additive and electrical conductivity of gadolinia doped ceria （GdonCe0.902-σ, GDC10） electrolyte was studied in this paper by X-ray diffraction （XRD）, scanning electron microscopy （SEM） and electrochemical impedance spectroscopy （EIS）. As the results,, the fully dense GDC10 electrolytes are obtained at a low temperature of 800℃ with 2.5 mol% Li20 as sintering additive （called 5LiGDCS00）. During sintering process, lithium oxides adsorbed by around GDC10 surface help to sinter at 800~C and are kept at the grain boundary of GDC10 in the end. The fine grains of 100-400 nm and high electrical conductivity of 0.014 S/cm at 600~C in 5LiGDC800 were achieved, which contributed to the lower sintering temperature and enhanced grain boundary conductivity, respectively. Lithium, staying at grain boundary, reduces the depletion of oxygen vacancies in the space charge layers and increases the oxygen vacancy concentration in the grain boundary, which leads to improve the total electrical conductivity of 5LiGDC800.展开更多
In the present study,we report a fabrication of dual-mode carbon coated gadolinia C@Gd_(2)O_(3)particles by a facile hydrothermal synthesis method without using any organic solvents.The prepared C@Gd_(2)O_(3)particles...In the present study,we report a fabrication of dual-mode carbon coated gadolinia C@Gd_(2)O_(3)particles by a facile hydrothermal synthesis method without using any organic solvents.The prepared C@Gd_(2)O_(3)particles have a core-shell structure and a narrow size distribution in the range of 261±27 nm.The fluorescent properties of the prepared C@Gd_(2)O_(3)particles were accessed by a room-temperature photoluminescence study,while the longitudinal relaxivity(r1)was examined by using a clinical 1.5 T MRI scanner.A murine fibroblast L-929 cell line was used to examine the cytotoxicity and capability of the prepared C@Gd_(2)O_(3)particles for the fluorescent labeling.The obtained results show that the prepared C@Gd_(2)O_(3)particles could be used as a dual-mode contrast agent for magnetic resonance and fluorescence imaging.展开更多
A kind of novel ceria electrolyte was examined.Various trivalent oxides were added as co-dopants to Ce 0.8Gd 0.2O 1.9,and their effects on the conductivity of ceria electrolyte were discussed.It has been foun...A kind of novel ceria electrolyte was examined.Various trivalent oxides were added as co-dopants to Ce 0.8Gd 0.2O 1.9,and their effects on the conductivity of ceria electrolyte were discussed.It has been found that the co-dopant of trivalent oxides of Sm,Nd,La and Y improves the ionic conductivity notably.Furthermore,the fine original powders,co-dopant and higher sintering temperature may hasten the sintering.展开更多
基金supported by the National Natural Science Foundation of China (Grant No. 50730004)the Ministry of Science and Technology of the People’s Republic of China (No. 2009DFA6136)
文摘Ceria-based electrolytes have been widely researched in intermediate-temperature solid oxide fuel cell （SOFC）, which might be operated at 500-600℃. Sintering behavior with lithium oxide as sintering additive and electrical conductivity of gadolinia doped ceria （GdonCe0.902-σ, GDC10） electrolyte was studied in this paper by X-ray diffraction （XRD）, scanning electron microscopy （SEM） and electrochemical impedance spectroscopy （EIS）. As the results,, the fully dense GDC10 electrolytes are obtained at a low temperature of 800℃ with 2.5 mol% Li20 as sintering additive （called 5LiGDCS00）. During sintering process, lithium oxides adsorbed by around GDC10 surface help to sinter at 800~C and are kept at the grain boundary of GDC10 in the end. The fine grains of 100-400 nm and high electrical conductivity of 0.014 S/cm at 600~C in 5LiGDC800 were achieved, which contributed to the lower sintering temperature and enhanced grain boundary conductivity, respectively. Lithium, staying at grain boundary, reduces the depletion of oxygen vacancies in the space charge layers and increases the oxygen vacancy concentration in the grain boundary, which leads to improve the total electrical conductivity of 5LiGDC800.
基金supported by the 2014 Post-Doc,Development Program of Pusan National Universitysupported by the National Research Foundation of Korea(NRF)grant funded by the Korea government(MSIP)(No.2014R1A2A1A11051146).
文摘In the present study,we report a fabrication of dual-mode carbon coated gadolinia C@Gd_(2)O_(3)particles by a facile hydrothermal synthesis method without using any organic solvents.The prepared C@Gd_(2)O_(3)particles have a core-shell structure and a narrow size distribution in the range of 261±27 nm.The fluorescent properties of the prepared C@Gd_(2)O_(3)particles were accessed by a room-temperature photoluminescence study,while the longitudinal relaxivity(r1)was examined by using a clinical 1.5 T MRI scanner.A murine fibroblast L-929 cell line was used to examine the cytotoxicity and capability of the prepared C@Gd_(2)O_(3)particles for the fluorescent labeling.The obtained results show that the prepared C@Gd_(2)O_(3)particles could be used as a dual-mode contrast agent for magnetic resonance and fluorescence imaging.
基金supported by the National Basic Research Program of China (973 Program 2010CB732302+5 种基金 2012CB215500)the National High Technology Research and Development Program of China (863 Program 2011AA050704)the National Natural Science Foundation of China (21376238 21306189 51101146)~~
文摘A kind of novel ceria electrolyte was examined.Various trivalent oxides were added as co-dopants to Ce 0.8Gd 0.2O 1.9,and their effects on the conductivity of ceria electrolyte were discussed.It has been found that the co-dopant of trivalent oxides of Sm,Nd,La and Y improves the ionic conductivity notably.Furthermore,the fine original powders,co-dopant and higher sintering temperature may hasten the sintering.
