Jo Sung Eun, Jeon SungHyun, Kim Hyong June, Yang Byung Chan, Ju Kyoungjae, Gür Turgut M, Jung WooChul, An Jihwan
Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Pohang, 37673, South Korea.
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, South Korea.
Small Methods. 2024 Jan;8(1):e2300790. doi: 10.1002/smtd.202300790. Epub 2023 Sep 25.
Employing porous structures is essential in high-performance electrochemical energy devices. However, obtaining uniform functional coatings on high-tortuosity structures can be challenging, even with specialized processes such as atomic layer deposition (ALD). Herein, a novel method for achieving a porous composite electrode for solid oxide fuel cells by coating La Sr Co Fe O -δ (LSCF) powders with ZrO using a powder ALD process is presented. Unlike conventional ALD, powder ALD can be used to fabricate extremely uniform coatings on porous electrodes with a thickness of tens of micrometers. The powder ALD ZrO coating is found to effectively suppress chemical degradation of the LSCF electrodes. The cell with the powder ALD coated cathode shows a 2.2 times higher maximum power density and 60% lower thermal degradation in activation resistance than the bare LSCF cathode cell at 700-750 °C. The result demonstrated in this study is expected to have significant implications for high-performance and durable electrodes in energy conversion/storage devices.
采用多孔结构对于高性能电化学能量装置至关重要。然而，即使采用诸如原子层沉积（ALD）等特殊工艺，在高曲折度结构上获得均匀的功能涂层也可能具有挑战性。在此，提出了一种通过使用粉末ALD工艺用ZrO涂覆La Sr Co Fe O -δ（LSCF）粉末来制备用于固体氧化物燃料电池的多孔复合电极的新方法。与传统ALD不同，粉末ALD可用于在厚度为几十微米的多孔电极上制备极其均匀的涂层。发现粉末ALD ZrO涂层能有效抑制LSCF电极的化学降解。在700 - 750°C下，具有粉末ALD涂覆阴极的电池比裸LSCF阴极电池的最大功率密度高2.2倍，活化电阻的热降解低60%。本研究中展示的结果有望对能量转换/存储装置中的高性能和耐用电极产生重大影响。
