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首页> 外文会议>International symposium on solid oxide fuel cells >INCREASED CATHODE PERFORMANCE USING A STRUCTURED ELECTROLYTE SURFACE
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INCREASED CATHODE PERFORMANCE USING A STRUCTURED ELECTROLYTE SURFACE

机译：使用结构化电解质表面增加阴极性能

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A considerable part of the power losses in a conventional planar SOFC single cell occurs due to the polarization resistance of the cathode/ electrolyte interface. Therefore the development of a cathode with low over-potential and sufficient long term stability is important. In case of a screen printed LSM cathode layer (LSM: La_(1-x)Sr_xMnO_3) on an 8YSZ electrolyte substrate (8YSZ: 8 mol% Y_2O_3 doped ZrO_2) the cathodic reaction is generally assumed to be restricted to the three phase boundary between cathode, oxidant and the electrolyte surface. One method to increase this electrochemical active area is to increase the cathode/electrolyte interface by interlocking electrolyte and cathode. A well defined, three dimensional interface was realized by screenprinting a porous monolayer of individual 8YSZ-particles (particle size ≈ 17 μm) onto the electrolyte substrate. The structured electrolyte surface was covered with a thin LSM MOD layer (MOD: metallo-organic-deposition, approx. 80 nm thick) which exhibits a large amount of three phase boundaries. Finally a screen printed LSM layer was applied as a current collector. Single cells with these modified cathodes showed an improved long term stability due to the better adhesion of the cathode layer and a considerable increase in performance due to the decrease of the polarization losses at the cathode/electrolyte interface. A maximum power density of 0.95 W/cm~2 at 950°C was achieved using air as the oxidant (0.7 l/min) and hydrogen as the fuel (0.5 l/min, 15 % fuel utilization).
机译：由于阴极/电解质界面的偏振电阻，发生了传统的平面SOFC单电池中的相当大的功率损耗。因此，具有低潜力和足够长期稳定性的阴极的发展是重要的。在屏幕上印刷的LSM阴极层（LSM：LA_（1-X）SR_XMNO_3）的情况下（80SZ：8MOL％Y_2O_3掺杂ZRO_2），通常假设阴极反应限制在三相边界之间阴极，氧化剂和电解质表面。增加该电化学有源区域的一种方法是通过互锁电解质和阴极增加阴极/电解质界面。通过将多孔的单层（粒径≈17μm）筛选到电解质底物上，实现了明确的三维界面。结构化电解质表面用薄的LSM mod层（mod：金属 - 有机沉积，约80nm厚）覆盖，其表现出大量的三相边界。最后，将屏幕印刷的LSM层作为集电器施加。具有这些改性阴极的单个细胞由于阴极层的更好粘附而具有更好的长期稳定性，并且由于阴极/电解质界面处的偏振损耗的降低而显着增加。使用空气作为氧化剂（0.7L / min）和氢气为燃料（0.5L / min，燃料利用率为15％，燃料利用率为0.95℃，以950℃的最大功率密度为0.95W / cm〜2。

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