采用海藻酸钠自组装法制备了具有定向直通孔道的氧化钇稳定氧化锆(YSZ)支撑体,向多孔支撑体内部浸渍Ni纳米粒子得到固体氧化物燃料电池的阳极。结果表明:YSZ支撑体的孔径随固相含量的增大而减小,同时也随着CaCl2溶液浓度的增大而减小。...采用海藻酸钠自组装法制备了具有定向直通孔道的氧化钇稳定氧化锆(YSZ)支撑体,向多孔支撑体内部浸渍Ni纳米粒子得到固体氧化物燃料电池的阳极。结果表明:YSZ支撑体的孔径随固相含量的增大而减小,同时也随着CaCl2溶液浓度的增大而减小。使用氢气为燃料、空气为氧化剂,Ni–YSZ/YSZ/LSM–SDC电池在650℃的开路电压在1 V以上,800℃时的最大功率密度为225 m W/cm2。通过调节阳极的孔隙率及电解质厚度有望大幅度提高电池的输出性能,实现直通孔陶瓷在固体氧化物燃料电池上的应用。展开更多
Yttria stabilized zirconia(YSZ) was deposited on the line cut β-NiAl substrate by electron-beam physical vapour deposition(EB-PVD), and the cyclic oxidation behaviors of thermal barrier coatings on β-NiAl substrate ...Yttria stabilized zirconia(YSZ) was deposited on the line cut β-NiAl substrate by electron-beam physical vapour deposition(EB-PVD), and the cyclic oxidation behaviors of thermal barrier coatings on β-NiAl substrate were investigated in 1 h thermal cycles at 1 200 ℃ in air. The results show that the samples fail after 80?100 cycles. Sub-interface cavitations in the substrate develop due to depletion of Al in forming thermally grown oxides(TGOs). The collapse and closing up of cavities result in the ragged YSZ/TGO/substrate interface. Since the specific crack trajectories are quite sensitive to local geometry, cracks along the YSZ/TGO/substrate interfaces ultimately lead to YSZ spallation.展开更多
文摘采用海藻酸钠自组装法制备了具有定向直通孔道的氧化钇稳定氧化锆(YSZ)支撑体,向多孔支撑体内部浸渍Ni纳米粒子得到固体氧化物燃料电池的阳极。结果表明:YSZ支撑体的孔径随固相含量的增大而减小,同时也随着CaCl2溶液浓度的增大而减小。使用氢气为燃料、空气为氧化剂,Ni–YSZ/YSZ/LSM–SDC电池在650℃的开路电压在1 V以上,800℃时的最大功率密度为225 m W/cm2。通过调节阳极的孔隙率及电解质厚度有望大幅度提高电池的输出性能,实现直通孔陶瓷在固体氧化物燃料电池上的应用。
基金Project(50571005) supported by the National Natural Science Foundation of China
文摘Yttria stabilized zirconia(YSZ) was deposited on the line cut β-NiAl substrate by electron-beam physical vapour deposition(EB-PVD), and the cyclic oxidation behaviors of thermal barrier coatings on β-NiAl substrate were investigated in 1 h thermal cycles at 1 200 ℃ in air. The results show that the samples fail after 80?100 cycles. Sub-interface cavitations in the substrate develop due to depletion of Al in forming thermally grown oxides(TGOs). The collapse and closing up of cavities result in the ragged YSZ/TGO/substrate interface. Since the specific crack trajectories are quite sensitive to local geometry, cracks along the YSZ/TGO/substrate interfaces ultimately lead to YSZ spallation.
