Naturally diffused sintering aid for highly conductive bilayer electrolytes in solid oxide cells

Authors
Kim, JunseokIm, SeunghyeokOh, Seol HeeLee, Ji YeongYoon, Kyung JoongSon, Ji-WonYang, SungeunKim, Byung-KookLee, Jong-HeunLee, Hae-WeonLee, Jong-HoJi, Ho-Il
Issue Date
2021-10
Publisher
AMER ASSOC ADVANCEMENT SCIENCE
Citation
SCIENCE ADVANCES, v.7, no.40
Abstract
Solid oxide cells (SOCs) are promising sustainable and efficient electrochemical energy conversion devices. The application of a bilayer electrolyte comprising wide electrolytic oxide and highly conductive oxide is essential to lower the operating temperatures while maintaining high performance. However, a structurally and chemically ideal bilayer has been unattainable through cost-effective conventional ceramic processes. Here, we describe a strategy of naturally diffused sintering aid allowing the fabrication of defect-free doped-zirconia/doped-ceria bilayer electrolyte with full density and reduced interdiffusion layer at lower sintering temperature owing to the supply of small but appropriate amount of sintering aid from doped zirconia to doped ceria that makes the thermal shrinkages of both layers perfectly congruent. The resulting SOCs exhibit a minimal ohmic loss of 0.09 ohm cm(2) and remarkable performances in both fuel cell (power density exceeding 1.3 W cm(-2)) and electrolysis (current density of -1.27 A cm(-2) at 1.3 V) operations at 700 degrees C.
Keywords
FUEL-CELLS; DOPED CERIA; BARRIER-LAYER; OXYGEN ELECTRODES; CATHODE MATERIALS; PERFORMANCE; FABRICATION; SOFC; YSZ; GDC; FUEL-CELLS; DOPED CERIA; BARRIER-LAYER; OXYGEN ELECTRODES; CATHODE MATERIALS; PERFORMANCE; FABRICATION; SOFC; YSZ; GDC
ISSN
2375-2548
URI
https://pubs.kist.re.kr/handle/201004/116310
DOI
10.1126/sciadv.abj8590
Appears in Collections:
KIST Article > 2021
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