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Title: Microstructural and chemical evolution near anode triple phase boundary in Ni/YSZ solid oxide fuel cells

Abstract

In this study, we report the microstructural and chemical evolution of anode grain boundaries and triple phase boundary (TPB) junctions of Ni/YSZ anode supported solid oxide fuel cells. A NiO phase was found to develop along the Ni/YSZ interfaces extending to TPBs in the operated cells. The thickness of the NiO ribbon phase remains constant at ~5 nm in hydrogen for operating durations up to 540 h. When operating on synthesis gas, an increase in interphase thickness was observed from ~11 nm for 24 h of operation to ~51 nm for 550 h of operation. YSZ phases are observed to be stable in H2 over 540 h of operation. However, for the cell operated in syngas for 550 h, a 5–10 nm tetragonal YSZ (t-YSZ) interfacial layer was identified that originated from the Ni/YSZ interfaces. Yttrium species seem to segregate to the interfaces during operation, leading to the formation of t-YSZ in the Y-depleted regions.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
National Energy Technology Lab. (NETL), Pittsburgh, PA, and Morgantown, WV (United States). In-house Research
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1052201
Report Number(s):
TPR-3529
Journal ID: ISSN 0167-2738
DOE Contract Number:  
DE-FE0004000
Resource Type:
Journal Article
Journal Name:
Solid State Ionics
Additional Journal Information:
Journal Volume: 204-205; Journal ID: ISSN 0167-2738
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; Solid oxide fuel cells; Anodes; Interfaces; Degradation; Microstructure; Transmission electron microscopy

Citation Formats

Chen, Yun, Chen, Song, Hacket, Gregory, Finklea, Harry, Song, Zueyan, and Gerdes, Kirk. Microstructural and chemical evolution near anode triple phase boundary in Ni/YSZ solid oxide fuel cells. United States: N. p., 2011. Web. doi:10.1016/j.ssi.2011.10.005.
Chen, Yun, Chen, Song, Hacket, Gregory, Finklea, Harry, Song, Zueyan, & Gerdes, Kirk. Microstructural and chemical evolution near anode triple phase boundary in Ni/YSZ solid oxide fuel cells. United States. doi:10.1016/j.ssi.2011.10.005.
Chen, Yun, Chen, Song, Hacket, Gregory, Finklea, Harry, Song, Zueyan, and Gerdes, Kirk. Thu . "Microstructural and chemical evolution near anode triple phase boundary in Ni/YSZ solid oxide fuel cells". United States. doi:10.1016/j.ssi.2011.10.005.
@article{osti_1052201,
title = {Microstructural and chemical evolution near anode triple phase boundary in Ni/YSZ solid oxide fuel cells},
author = {Chen, Yun and Chen, Song and Hacket, Gregory and Finklea, Harry and Song, Zueyan and Gerdes, Kirk},
abstractNote = {In this study, we report the microstructural and chemical evolution of anode grain boundaries and triple phase boundary (TPB) junctions of Ni/YSZ anode supported solid oxide fuel cells. A NiO phase was found to develop along the Ni/YSZ interfaces extending to TPBs in the operated cells. The thickness of the NiO ribbon phase remains constant at ~5 nm in hydrogen for operating durations up to 540 h. When operating on synthesis gas, an increase in interphase thickness was observed from ~11 nm for 24 h of operation to ~51 nm for 550 h of operation. YSZ phases are observed to be stable in H2 over 540 h of operation. However, for the cell operated in syngas for 550 h, a 5–10 nm tetragonal YSZ (t-YSZ) interfacial layer was identified that originated from the Ni/YSZ interfaces. Yttrium species seem to segregate to the interfaces during operation, leading to the formation of t-YSZ in the Y-depleted regions.},
doi = {10.1016/j.ssi.2011.10.005},
journal = {Solid State Ionics},
issn = {0167-2738},
number = ,
volume = 204-205,
place = {United States},
year = {2011},
month = {12}
}