The effects of through-thickness pinholes in an electrolyte on re-oxidation and mechanical damage of anode-supported solid oxide fuel cells are discussed in this paper. Pinholes with a dimension greater than approximately 10 μm were detected by dye penetrant inspection using half-cells fabricated through a co-sintering method. In single cells with such pinholes, the leakage of oxygen occurred through the through-thickness pinholes under open-circuit voltage (OCV) conditions when the fuel supply was discontinued. The oxygen leakage caused the oxidation of Ni in the anode, forming semicircular re-oxidized regions on the electrolyte side of the anode substrate. The oxygen permeation fluxes in the electrolyte, which were deduced from the measured reduction in OCV during the operation of fuel shut-off, are shown to correlate well with the time elapsed from the shut-off of the fuel gas supply to the onset of mechanical damage monitored by acoustic emissions. The correlation indicates that the oxidation rate of the anode substrate is accelerated due to the presence of pinholes in the electrolyte, which can result in mechanical damages.

中文翻译：

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电解液中针孔对阳极负载型固体氧化物燃料电池再氧化耐受性的影响

本文讨论了电解质中贯穿厚度的针孔对阳极支撑的固体氧化物燃料电池再氧化和机械损伤的影响。使用通过共烧结方法制造的半电池，通过染料渗透检查检测到尺寸大于约 10 μm 的针孔。在具有这种针孔的单电池中，当燃料供应中断时，在开路电压 (OCV) 条件下，氧气会通过全厚度针孔发生泄漏。氧气泄漏导致阳极中的 Ni 氧化，在阳极基板的电解质侧形成半圆形的再氧化区域。电解液中的氧渗透通量，这是从燃料切断操作期间测得的 OCV 减少推导出来的，显示与从关闭燃气供应到通过声发射监测到的机械损坏开始所经过的时间有很好的相关性。相关性表明，由于电解质中存在针孔，阳极基板的氧化速率加快，这可能导致机械损坏。