DataVXChemistry of MaterialsPaper
journal article·2024-03-26

Phase Stability of Perovskite Oxide Electrodes under Operating Condition in Solid Oxide Fuel Cell

Jinsil Lee, Yonghun Shin, Taeyun Kim, Wooseon Choi, Min-Hyoung Jung, Young-Min Kim, Kyung Joong Yoon, Hu Young Jeong, Donghwa Lee, Jong Hoon Joo

Chemistry of Materials· Volume 36· Issue 6
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Source abstract

Abstract

Perovskite-based materials are typically used as electrodes in solid oxide cells (SOCs) owing to their high catalytic activity in oxygen exchange reactions. The degradation of typical SOCs is a well-known phenomenon that is primarily attributed to the A-site cation redistribution within perovskite-based electrodes at elevated operating temperatures. To date, investigations of the degradation and stability of perovskite electrodes have predominantly focused on assessing thin-film electrodes under an open-circuit voltage. This study proposes a detailed degradation mechanism of electrodes based on bulk-dense materials under the operating conditions of an actual solid oxide fuel cell. Our findings revealed that La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3–δ is decomposed into SrO, spinel phase ((CoFe) 3 O 4 ), and La-rich perovskite in the subsurface region under cathodic bias conditions. Additionally, the results of this study indicate that the phase decomposition associated with elements in the B-site must be considered to improve the enhancement of the stability and oxygen reduction reaction activity.
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Research context

Electronic materialsCatalysis & surfaces

OpenAlex topics: Advancements in Solid Oxide Fuel Cells · Electronic and Structural Properties of Oxides · Magnetic and transport properties of perovskites and related materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Republic of Korea

Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang 37673, Republic of Korea

School of Materials Science and Engineering, Gwangju Institute of Science and Technology, 123, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Republic of Korea

Department of Energy Science, Sungkyunkwan University (SKKU), Suwon 16419, Republic of Korea

Center for Energy Materials Research, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea

Graduate school of Semiconductor Materials and Devices Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea

Division of Advanced Materials Science, Pohang University of Science and Technology, Pohang 37673, Republic of Korea

Research Center for Innovative Energy and Carbon Optimized Synthesis for Chemicals(Inn-ECOSysChem), Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Republic of Korea

Funding

National Research Foundation of Korea · Korea Institute of Science and Technology

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