Ni/YSZ anode – Effect of pre-treatments on cell degradation and microstructures

Publication: Research - peer-reviewJournal article – Annual report year: 2011

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Ni/YSZ anode – Effect of pre-treatments on cell degradation and microstructures. / Hauch, Anne; Jørgensen, Peter Stanley; Brodersen, Karen; Mogensen, Mogens Bjerg.

In: Journal of Power Sources, Vol. 196, No. 21, 2011, p. 8931-8941.

Publication: Research - peer-reviewJournal article – Annual report year: 2011

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Author

Hauch, Anne; Jørgensen, Peter Stanley; Brodersen, Karen; Mogensen, Mogens Bjerg / Ni/YSZ anode – Effect of pre-treatments on cell degradation and microstructures.

In: Journal of Power Sources, Vol. 196, No. 21, 2011, p. 8931-8941.

Publication: Research - peer-reviewJournal article – Annual report year: 2011

Bibtex

@article{b22bf53b81a44d5cb93cae844e9b158e,
title = "Ni/YSZ anode – Effect of pre-treatments on cell degradation and microstructures",
keywords = "Solid Oxide Fuel Cells",
publisher = "Elsevier S.A.",
author = "Anne Hauch and Jørgensen, {Peter Stanley} and Karen Brodersen and Mogensen, {Mogens Bjerg}",
year = "2011",
doi = "10.1016/j.jpowsour.2011.01.009",
volume = "196",
number = "21",
pages = "8931--8941",
journal = "Journal of Power Sources",
issn = "0378-7753",

}

RIS

TY - JOUR

T1 - Ni/YSZ anode – Effect of pre-treatments on cell degradation and microstructures

A1 - Hauch,Anne

A1 - Jørgensen,Peter Stanley

A1 - Brodersen,Karen

A1 - Mogensen,Mogens Bjerg

AU - Hauch,Anne

AU - Jørgensen,Peter Stanley

AU - Brodersen,Karen

AU - Mogensen,Mogens Bjerg

PB - Elsevier S.A.

PY - 2011

Y1 - 2011

N2 - Anode supported (Ni/YSZ–YSZ–LSM/YSZ) solid oxide fuel cells were tested and the degradation over hundreds of hours was monitored and analyzed by impedance spectroscopy. Test conditions were chosen to focus on the Ni/YSZ anode degradation and all tests were operated at 750°C, a current density of 0.75Acm−2. Oxygen was supplied to the cathode and the anode inlet gas mixture had a high p(H2O)/p(H2) ratio of 0.4/0.6. Commercially available gasses were applied. The effect of different types of pre-treatments on the Ni/YSZ electrode degradation during subsequent fuel cell testing was investigated. Pre-treatments included operating at OCV (4% and 40% H2O in H2) prior to fuel cell testing, cleaning of the inlet H2 gas at 700°C and processing the anode half cell via multilayer tape casting. Analyses of impedance spectra showed that the increase in the charge transfer reaction resistance in the Ni/YSZ (RNi,TPB) was decreased to ¼ or less for the pre-treated and fuel cell tested cells when compared with a non-pre-treated reference tested cell; all operated at the same fuel cell test conditions. Scanning electron microscopy and image analyses for the non-pre-treated reference tested cell and selected pre-treated cells showed significant differences in the area fractions of percolating nickel both in the active anode and support layer.

AB - Anode supported (Ni/YSZ–YSZ–LSM/YSZ) solid oxide fuel cells were tested and the degradation over hundreds of hours was monitored and analyzed by impedance spectroscopy. Test conditions were chosen to focus on the Ni/YSZ anode degradation and all tests were operated at 750°C, a current density of 0.75Acm−2. Oxygen was supplied to the cathode and the anode inlet gas mixture had a high p(H2O)/p(H2) ratio of 0.4/0.6. Commercially available gasses were applied. The effect of different types of pre-treatments on the Ni/YSZ electrode degradation during subsequent fuel cell testing was investigated. Pre-treatments included operating at OCV (4% and 40% H2O in H2) prior to fuel cell testing, cleaning of the inlet H2 gas at 700°C and processing the anode half cell via multilayer tape casting. Analyses of impedance spectra showed that the increase in the charge transfer reaction resistance in the Ni/YSZ (RNi,TPB) was decreased to ¼ or less for the pre-treated and fuel cell tested cells when compared with a non-pre-treated reference tested cell; all operated at the same fuel cell test conditions. Scanning electron microscopy and image analyses for the non-pre-treated reference tested cell and selected pre-treated cells showed significant differences in the area fractions of percolating nickel both in the active anode and support layer.

KW - Solid Oxide Fuel Cells

U2 - 10.1016/j.jpowsour.2011.01.009

DO - 10.1016/j.jpowsour.2011.01.009

JO - Journal of Power Sources

JF - Journal of Power Sources

SN - 0378-7753

IS - 21

VL - 196

SP - 8931

EP - 8941

ER -