通过甘氨酸硝酸盐法合成出添加0~6 mol%La_2O_3-CaO的NiO-SDC(Sm0.2Ce0.8O1.9)复合阳极(La_2O_3-CaO/NiO-SDC)粉体,以SDC为电解质、BSCF(Ba0.5Sr0.5Co0.8Fe0.2O3-δ)为阴极构建SOFC单电池。考察了La_2O_3-CaO添加对Ni-SDC阳极微观组织...通过甘氨酸硝酸盐法合成出添加0~6 mol%La_2O_3-CaO的NiO-SDC(Sm0.2Ce0.8O1.9)复合阳极(La_2O_3-CaO/NiO-SDC)粉体,以SDC为电解质、BSCF(Ba0.5Sr0.5Co0.8Fe0.2O3-δ)为阴极构建SOFC单电池。考察了La_2O_3-CaO添加对Ni-SDC阳极微观组织和电化学性能等的影响;以乙醇为燃料气测定单电池的电化学性能和阳极的抗积碳性能。实验结果表明,La_2O_3-CaO/NiO-SDC复合阳极主要由NiO和SDC相组成,而La_2O_3和CaO的存在状态与其加入量有关。La_2O_3-CaO的加入,使复合阳极的电导率有所降低。添加少量La_2O_3-CaO阳极的SOFC单电池在乙醇燃料中的电池性能有所增加,800℃时添加2 mol%La_2O_3-CaO的Ni-SDC阳极的单电池最大输出功率为377.79 m W·cm-2,而Ni-SDC阳极单电池的最大输出功率仅158.86 m W·cm-2。此外,La_2O_3-CaO的添加有效减少了Ni-SDC阳极单电池在乙醇燃料中的积碳,提高了电池的运行稳定性。展开更多
La（0.6）Sr（0.4）Co（0.2）Fe（0.8）O（3-δ）（LSCF） anodes were infiltrated by Gd（0.2）Ce（0.8）O（1.9）GDC） nanoparticles to improve the oxygen evolution reaction（OER） performance of solid oxide electrolysis ce...La（0.6）Sr（0.4）Co（0.2）Fe（0.8）O（3-δ）（LSCF） anodes were infiltrated by Gd（0.2）Ce（0.8）O（1.9）GDC） nanoparticles to improve the oxygen evolution reaction（OER） performance of solid oxide electrolysis cells（SOECs） in CO2 electroreduction. The effect of GDC loading was investigated, and 10 wt% GDC nanoparticle infiltration of the LSCF（10 GDC/LSCF） anode results in the highest OER performance. Electrochemical impedance spectra measurements indicate that the infiltration by GDC nanoparticles greatly decreases the polarization resistance of the SOECs with the 10 GDC/LSCF anodes. The following distribution of relaxation time analysis suggests that four individual electrode processes are involved in the OER and that all of them are accelerated on the 10 GDC/LSCF anode. Three phase boundaries, surface oxygen vacancies, and bulk oxygen mobility increased, based on scanning electron microscopy and temperature-programmed desorption of O2 characterizations, and contributed to the enhancement of the four electrode processes of the OER and electrochemical performance of SOECs.展开更多
文摘通过甘氨酸硝酸盐法合成出添加0~6 mol%La_2O_3-CaO的NiO-SDC(Sm0.2Ce0.8O1.9)复合阳极(La_2O_3-CaO/NiO-SDC)粉体,以SDC为电解质、BSCF(Ba0.5Sr0.5Co0.8Fe0.2O3-δ)为阴极构建SOFC单电池。考察了La_2O_3-CaO添加对Ni-SDC阳极微观组织和电化学性能等的影响;以乙醇为燃料气测定单电池的电化学性能和阳极的抗积碳性能。实验结果表明,La_2O_3-CaO/NiO-SDC复合阳极主要由NiO和SDC相组成,而La_2O_3和CaO的存在状态与其加入量有关。La_2O_3-CaO的加入,使复合阳极的电导率有所降低。添加少量La_2O_3-CaO阳极的SOFC单电池在乙醇燃料中的电池性能有所增加,800℃时添加2 mol%La_2O_3-CaO的Ni-SDC阳极的单电池最大输出功率为377.79 m W·cm-2,而Ni-SDC阳极单电池的最大输出功率仅158.86 m W·cm-2。此外,La_2O_3-CaO的添加有效减少了Ni-SDC阳极单电池在乙醇燃料中的积碳,提高了电池的运行稳定性。
基金This work was supported by the National Key R&D Program of China(2017YFA0700102)the National Natural Science Foundation of China(21703237,21573222,91545202)+1 种基金Dalian Institute of Chemical Physics(DICP DMTO201702)the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB17020200)and CAS Youth Innovation Promotion(2015145)~~
文摘La（0.6）Sr（0.4）Co（0.2）Fe（0.8）O（3-δ）（LSCF） anodes were infiltrated by Gd（0.2）Ce（0.8）O（1.9）GDC） nanoparticles to improve the oxygen evolution reaction（OER） performance of solid oxide electrolysis cells（SOECs） in CO2 electroreduction. The effect of GDC loading was investigated, and 10 wt% GDC nanoparticle infiltration of the LSCF（10 GDC/LSCF） anode results in the highest OER performance. Electrochemical impedance spectra measurements indicate that the infiltration by GDC nanoparticles greatly decreases the polarization resistance of the SOECs with the 10 GDC/LSCF anodes. The following distribution of relaxation time analysis suggests that four individual electrode processes are involved in the OER and that all of them are accelerated on the 10 GDC/LSCF anode. Three phase boundaries, surface oxygen vacancies, and bulk oxygen mobility increased, based on scanning electron microscopy and temperature-programmed desorption of O2 characterizations, and contributed to the enhancement of the four electrode processes of the OER and electrochemical performance of SOECs.
