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Atomic Layer Deposited Zirconia Overcoats as On-Board Strontium Getters for Improved Solid Oxide Fuel Cell Nanocomposite Cathode Durability
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-03-23 00:00:00 , DOI: 10.1021/acsaem.0c00558 Yubo Zhang 1 , Yeting Wen 2 , Kevin Huang 2 , Jason D. Nicholas 1
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-03-23 00:00:00 , DOI: 10.1021/acsaem.0c00558 Yubo Zhang 1 , Yeting Wen 2 , Kevin Huang 2 , Jason D. Nicholas 1
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Here, a flow type atomic layer deposition (ALD) reactor was used to deposit 1–10 nm thick porous ZrO2 overcoats within the pores of conventional La0.6Sr0.4Co0.8Fe0.2O3–x (LSCF)-infiltrated Ce0.9Gd0.1O1.95 (GDC) solid oxide fuel cell (SOFC) cathodes. Both coated and uncoated cathodes displayed initial 650 °C polarization resistance (Rp) values of 0.09 ± 0.03 Ω cm2. However, improved stability was observed for cells with zirconia overcoats ≤5 nm thick. Specifically, 1000 h, symmetric cell, open-circuit, 650 °C Rp degradation rates decreased from 45%/kh for uncoated LSCF-GDC nanocomposite cathodes (NCCs) to 28%/kh, 18%/kh, and 12%/kh for identical LSCF-GDC NCCs with 1, 2, and 5 nm of zirconia overcoat, respectively. In contrast, identical LSCF-GDC NCCs with 10 nm of zirconia overcoat displayed 650 °C Rp degradation rates of 87%/kh. Scanning electron microscopy and controlled atmosphere impedance tests showed no significant changes in the LSCF infiltrate particle size or microporosity gas concentration polarization resistance with 1000 h of 650 °C aging. Instead, X-ray photoelectron spectroscopy indicated that zirconia overcoats decreased the amount of “surface Sr” on the LSCF, and X-ray diffraction detected SrZrO3 in samples with 5 or 10 nm thick zirconia overcoats. Hence, the lower degradation rates of LSCF-GDC NCCs with 1–5 nm thick zirconia overcoats were attributed to “cleanup” of deleterious “surface Sr” from the LSCF surface via the formation of SrZrO3, while the higher degradation rates of LSCF-GDC NCCs with 10 nm thick zirconia overcoats were attributed to the accumulation of excessive amounts of SrZrO3 hindering oxygen incorporation into the LSCF.
中文翻译：
原子层沉积氧化锆外涂层作为机载锶吸气剂，可改善固体氧化物燃料电池纳米复合材料阴极的耐久性
在这里，使用流式原子层沉积（ALD）反应器在传统的La 0.6 Sr 0.4 Co 0.8 Fe 0.2 O 3- x（LSCF）渗透的Ce 0.9 Gd的孔中沉积1-10 nm厚的多孔ZrO 2外涂层。0.1 O 1.95（GDC）固体氧化物燃料电池（SOFC）阴极。涂覆和未涂覆的阴极均显示650°C的初始极化电阻（R p）值为0.09±0.03Ωcm 2。但是，对于氧化锆外涂层厚度≤5nm的电池，观察到了更高的稳定性。特别是1000小时，对称电池，开路，650°C Rp降解速率从未涂覆的LSCF-GDC纳米复合阴极（NCC）的45％/ kh降低到相同的1、2和5 nm的LSCF-GDC NCC的28％/ kh，18％/ kh和12％/ kh。氧化锆外套。相反，具有10 nm氧化锆外涂层的相同LSCF-GDC NCC的650°C R p降解率为87％/ kh。扫描电子显微镜和受控大气阻抗测试显示，随着650°C的老化1000 h，LSCF的浸润粒径或微孔气体浓度极化电阻均无显着变化。相反，X射线光电子能谱表明氧化锆外涂层减少了LSCF上的“表面Sr”量，并且X射线衍射检测到了SrZrO 3。在具有5或10 nm厚的氧化锆外涂层的样品中。因此，具有1-5 nm厚的氧化锆外涂层的LSCF-GDC NCC的较低降解速率归因于通过形成SrZrO 3从LSCF表面“清除”了有害的“表面Sr” ，而较高的LSCF-GDC降解速率较高。具有10 nm厚氧化锆外涂层的GDC NCC归因于过量SrZrO 3的积累，阻碍了氧气掺入LSCF。
更新日期：2020-03-23
中文翻译：
原子层沉积氧化锆外涂层作为机载锶吸气剂，可改善固体氧化物燃料电池纳米复合材料阴极的耐久性
在这里，使用流式原子层沉积（ALD）反应器在传统的La 0.6 Sr 0.4 Co 0.8 Fe 0.2 O 3- x（LSCF）渗透的Ce 0.9 Gd的孔中沉积1-10 nm厚的多孔ZrO 2外涂层。0.1 O 1.95（GDC）固体氧化物燃料电池（SOFC）阴极。涂覆和未涂覆的阴极均显示650°C的初始极化电阻（R p）值为0.09±0.03Ωcm 2。但是，对于氧化锆外涂层厚度≤5nm的电池，观察到了更高的稳定性。特别是1000小时，对称电池，开路，650°C Rp降解速率从未涂覆的LSCF-GDC纳米复合阴极（NCC）的45％/ kh降低到相同的1、2和5 nm的LSCF-GDC NCC的28％/ kh，18％/ kh和12％/ kh。氧化锆外套。相反，具有10 nm氧化锆外涂层的相同LSCF-GDC NCC的650°C R p降解率为87％/ kh。扫描电子显微镜和受控大气阻抗测试显示，随着650°C的老化1000 h，LSCF的浸润粒径或微孔气体浓度极化电阻均无显着变化。相反，X射线光电子能谱表明氧化锆外涂层减少了LSCF上的“表面Sr”量，并且X射线衍射检测到了SrZrO 3。在具有5或10 nm厚的氧化锆外涂层的样品中。因此，具有1-5 nm厚的氧化锆外涂层的LSCF-GDC NCC的较低降解速率归因于通过形成SrZrO 3从LSCF表面“清除”了有害的“表面Sr” ，而较高的LSCF-GDC降解速率较高。具有10 nm厚氧化锆外涂层的GDC NCC归因于过量SrZrO 3的积累，阻碍了氧气掺入LSCF。
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