A comprehensive investigation of direct ammonia- fueled thin-film solid-oxide fuel cells: Performance, limitation, and prospectsopen access
- Authors
- Oh, Seongkook; Oh, Min Jun; Hong, Jongsup; Yoon, Kyung Joong; Ji, Ho-Il; Lee, Jong-Ho; Kang, Hyungmook; Son, Ji-Won; Yang, Sungeun
- Issue Date
- 16-9월-2022
- Publisher
- CELL PRESS
- Keywords
- Chemistry; electrochemical energy conversion; electrochemistry; engineering; materials science
- Citation
- ISCIENCE, v.25, no.9
- Indexed
- SCIE
SCOPUS
- Journal Title
- ISCIENCE
- Volume
- 25
- Number
- 9
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/145746
- DOI
- 10.1016/j.isci.2022.105009
- ISSN
- 2589-0042
- Abstract
- Ammonia is a promising carbon-free hydrogen carrier. Owing to their nickel-rich anodes and high operating temperatures, solid oxide fuel cells (SOFCs) can directly utilize NH3 fuel-direct-ammonia SOFCs (DA-SOFCs). Lowering the operating temperature can diversify application areas of DA-SOFCs. We tested direct-ammonia operation using two types of thin-film SOFCs (TF-SOFCs) under 500 to 650 degrees C and compared these with a conventional SOFC. The TF-SOFC with a nickel oxide gadolinium-doped ceria anode achieved a peak power density of 1330 mW cm(-2) (NH3 fuel under 650 degrees C), which is the best performance reported to date. However, the performance difference between the NH3 and H-2 operations was significant. Electrochemical impedance analyses, ammonia conversion quantification, and two-dimensional multi-physics modeling suggested that reduced ammonia conversion at low temperatures is the main cause of the performance gap. A comparative study with previously reported DA-SOFCs clarified that incorporating a more active ammonia decomposition catalyst will further improve low-temperature DA-SOFCs.
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