The conventional Ni cermet anode suffers from severe carbon deposition and sulfur poisoning when fossil fuels are used. Alternative anode materials are desired for high performance hydrocarbon fuel solid oxide fuel ce...The conventional Ni cermet anode suffers from severe carbon deposition and sulfur poisoning when fossil fuels are used. Alternative anode materials are desired for high performance hydrocarbon fuel solid oxide fuel cells （SOFCs）. We report the rational design of a very active Ni doped La0.6Sr0.4FeO3‐δ（LSFN） electrode for hydrocarbon fuel SOFCs. Homogeneously dispersed Ni‐Fe alloy nanoparticles were in situ extruded onto the surface of the LSFN particles during the operation of the cell. Sym‐metric SOFC single cells were prepared by impregnating a LSFN precursor solution onto a YSZ （yt‐tria stabilized zirconia） monolithic cell with a subsequent heat treatment. The open circuit voltage of the LSFN symmetric cell reached 1.18 and 1.0 V in humidified C3H8 and CH4 at 750？？, respective‐ly. The peak power densities of the cells were 400 and 230 mW/cm2 in humidified C3H8 and CH4, respectively. The electrode showed good stability in long term testing, which revealed LSFN has good catalytic activity for hydrocarbon fuel oxidation.展开更多
固态氧化物电解池(SOECs)因较高的能量转化效率在电化学还原CO_(2),实现“碳中和”社会方面备受关注。与非对称电池结构相比,对称SOECs的空气极和燃料极是相同或相近的材料,可以减少界面种类,改善电极与电解质的热膨胀匹配性,简化电池...固态氧化物电解池(SOECs)因较高的能量转化效率在电化学还原CO_(2),实现“碳中和”社会方面备受关注。与非对称电池结构相比,对称SOECs的空气极和燃料极是相同或相近的材料,可以减少界面种类,改善电极与电解质的热膨胀匹配性,简化电池的制备工艺。本研究合成了钙钛矿氧化物La_(x)Sr_(2–x)Fe_(1.5)Ni_(0.1)Mo_(0.4)O_(6–δ)(L_(x)SFNM,x=0.1、0.2、0.3、0.4),作为固体氧化物电解池的对称电极用于评估纯CO_(2)的电化学还原性能。掺入La^(3+)可以有效提高反应催化活性,其中L_(0.3)SFNM为电极的电解池表现出最高的电化学性能,800℃下,在空气中的极化电阻为0.07Ω·cm^(2),在50%CO-50%CO_(2)中的极化电阻为0.62Ω·cm^(2)。单电池L_(0.3)SFNM@LSGM|LSGM|L_(0.3)SFNM@LSGM在800℃和1.5 V电压下的电解电流密度为1.17 A·cm^(-2),在初始的50 h CO_(2)短期电解测试中表现出优异的稳定性,是一种理想的对称电极材料。展开更多
基金supported by the National Natural Science Foundation of China (51372271,51172275)the National Basic Research Program of China (973 Program,2012CB215402)~~
文摘The conventional Ni cermet anode suffers from severe carbon deposition and sulfur poisoning when fossil fuels are used. Alternative anode materials are desired for high performance hydrocarbon fuel solid oxide fuel cells （SOFCs）. We report the rational design of a very active Ni doped La0.6Sr0.4FeO3‐δ（LSFN） electrode for hydrocarbon fuel SOFCs. Homogeneously dispersed Ni‐Fe alloy nanoparticles were in situ extruded onto the surface of the LSFN particles during the operation of the cell. Sym‐metric SOFC single cells were prepared by impregnating a LSFN precursor solution onto a YSZ （yt‐tria stabilized zirconia） monolithic cell with a subsequent heat treatment. The open circuit voltage of the LSFN symmetric cell reached 1.18 and 1.0 V in humidified C3H8 and CH4 at 750？？, respective‐ly. The peak power densities of the cells were 400 and 230 mW/cm2 in humidified C3H8 and CH4, respectively. The electrode showed good stability in long term testing, which revealed LSFN has good catalytic activity for hydrocarbon fuel oxidation.
基金National Natural Science Foundation of China(51672298)State Grid Corporation of China(521205200011)。
文摘固态氧化物电解池(SOECs)因较高的能量转化效率在电化学还原CO_(2),实现“碳中和”社会方面备受关注。与非对称电池结构相比,对称SOECs的空气极和燃料极是相同或相近的材料,可以减少界面种类,改善电极与电解质的热膨胀匹配性,简化电池的制备工艺。本研究合成了钙钛矿氧化物La_(x)Sr_(2–x)Fe_(1.5)Ni_(0.1)Mo_(0.4)O_(6–δ)(L_(x)SFNM,x=0.1、0.2、0.3、0.4),作为固体氧化物电解池的对称电极用于评估纯CO_(2)的电化学还原性能。掺入La^(3+)可以有效提高反应催化活性,其中L_(0.3)SFNM为电极的电解池表现出最高的电化学性能,800℃下,在空气中的极化电阻为0.07Ω·cm^(2),在50%CO-50%CO_(2)中的极化电阻为0.62Ω·cm^(2)。单电池L_(0.3)SFNM@LSGM|LSGM|L_(0.3)SFNM@LSGM在800℃和1.5 V电压下的电解电流密度为1.17 A·cm^(-2),在初始的50 h CO_(2)短期电解测试中表现出优异的稳定性,是一种理想的对称电极材料。
