气候变化领域集成服务门户(CCPortal): Conditions for stable operation of solid oxide electrolysis cells: Oxygen electrode effects

CCPortal

DOI	10.1039/c9ee01664c
	Conditions for stable operation of solid oxide electrolysis cells: Oxygen electrode effects
	Park B.-K.; Zhang Q.; Voorhees P.W.; Barnett S.A.
发表日期	2019
ISSN	17545692
起始页码	3053
结束页码	3062
卷号	12 期号:10
英文摘要	Solid oxide electrolysis cells (SOECs) convert renewable electricity to fuels with efficiency substantially higher than other electrolysis technologies. However, questions remain regarding degradation mechanisms that limit SOEC long-term stability. One of the key degradation mechanisms is oxygen electrode delamination; although prior studies have improved the understanding of this mechanism, it is still difficult to predict how degradation depends on SOEC materials and operating conditions, i.e., temperature, voltage, and current density. Here we present a study aimed at developing a quantitative understanding of oxygen electrode delamination. Experimentally, a life test study of symmetric and full cells with yttria-stabilized zirconia (YSZ) electrolytes and Gd-doped ceria (GDC) barrier layers was done with three different perovskite oxygen electrode materials. Fracture was observed at the perovskite-GDC interface above a critical current density and below a critical operating temperature. A theory is presented that combines a calculation of the effective oxygen pressure across the electrolyte with an estimation of the pressure required for fracture. Fracture is correctly predicted for a critical oxygen partial pressure of ∼7200 atm and an associated electrode overpotential of ∼0.2 V, occurring at the electrode/GDC interface because of the relatively low perovskite fracture toughness. Damage at the GDC/YSZ interface was also observed in some cases and explained by a peak in the oxygen pressure at this interface. © 2019 The Royal Society of Chemistry.
英文关键词	Artificial life; Cerium oxide; Degradation; Electrodes; Electrolysis; Electrolytic cells; Fracture toughness; Oxygen; Perovskite; Regenerative fuel cells; Solid oxide fuel cells (SOFC); Yttria stabilized zirconia; Yttrium oxide; Zirconia; Degradation mechanism; Long term stability; Operating condition; Operating temperature; Oxygen electrode; Oxygen partial pressure; Renewable electricity; Yttria-stabilized zirconias (YSZ); Solid electrolytes; detection method; electricity; electrode; electrokinesis; electrolyte; experimental study; fuel cell; oxide; oxygen; partial pressure; perovskite; temperature effect
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/189808
作者单位	Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, United States
推荐引用方式 GB/T 7714	Park B.-K.,Zhang Q.,Voorhees P.W.,et al. Conditions for stable operation of solid oxide electrolysis cells: Oxygen electrode effects[J],2019,12(10).
APA	Park B.-K.,Zhang Q.,Voorhees P.W.,&Barnett S.A..(2019).Conditions for stable operation of solid oxide electrolysis cells: Oxygen electrode effects.Energy & Environmental Science,12(10).
MLA	Park B.-K.,et al."Conditions for stable operation of solid oxide electrolysis cells: Oxygen electrode effects".Energy & Environmental Science 12.10(2019).