High purity H2/H2O/Ni/SZ electrodes at 500 C

J. Høgh; K. V. Hansen; K. Norrman; I. Chorkendorff; T. Jacobsen; M. Mogensen

doi:10.1016/j.ssi.2012.12.015

High purity H₂/H₂O/Ni/SZ electrodes at 500 C

J. Høgh^*, K. V. Hansen, K. Norrman, I. Chorkendorff, T. Jacobsen, M. Mogensen

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

The performance of SOFC (solid oxide fuel cell) anodes is influenced negatively by impurities. In the present study segregation of impurities is minimized by using high purity materials at relatively low temperatures to prevent fast segregation. Ni point electrodes on polished single crystals of stabilized zirconia (SZ) with 10, 13 and 18 mol% yttria and one with 6 mol% scandia plus 4 mol% yttria were studied at open circuit voltage at 400-500 C in mixtures of H₂/H₂O over 46 days. The polarization resistances (R_p) for all samples increased significantly during the first 10-20 days at 500 C. No effect of the electrolyte composition on R _p was found. Surface sensitive techniques were used to analyze the composition of the nickel and the electrolytes before and after the electrochemical experiment. Impurities were found to segregate to the surfaces/interfaces, and they are believed to impede the electrode processes and hence to cause the increase in polarization resistance.

Original language	English
Pages (from-to)	11-18
Number of pages	8
Journal	Solid State Ionics
Volume	234
DOIs	https://doi.org/10.1016/j.ssi.2012.12.015
State	Published - 2013
Externally published	Yes

Bibliographical note

Funding Information:
This work is a part of Jens Høgh's Ph.D.-project and is sponsored by the Danish Technical Research Council (STVF) throughout the project period. This work was further supported financially by The Programme Commission on Sustainable Energy and Environment , The Danish Council for Strategic Research, via the Strategic Electrochemistry Research Center (SERC) ( www.serc.dk ), contract no. 2104-06-0011 .

Keywords

Anode
Impurities
SOFC

ASJC Scopus subject areas

General Chemistry
General Materials Science
Condensed Matter Physics

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.ssi.2012.12.015

Cite this

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title = "High purity H2/H2O/Ni/SZ electrodes at 500 C",

abstract = "The performance of SOFC (solid oxide fuel cell) anodes is influenced negatively by impurities. In the present study segregation of impurities is minimized by using high purity materials at relatively low temperatures to prevent fast segregation. Ni point electrodes on polished single crystals of stabilized zirconia (SZ) with 10, 13 and 18 mol\% yttria and one with 6 mol\% scandia plus 4 mol\% yttria were studied at open circuit voltage at 400-500 C in mixtures of H2/H2O over 46 days. The polarization resistances (Rp) for all samples increased significantly during the first 10-20 days at 500 C. No effect of the electrolyte composition on R p was found. Surface sensitive techniques were used to analyze the composition of the nickel and the electrolytes before and after the electrochemical experiment. Impurities were found to segregate to the surfaces/interfaces, and they are believed to impede the electrode processes and hence to cause the increase in polarization resistance.",

keywords = "Anode, Impurities, SOFC",

author = "J. H{\o}gh and Hansen, \{K. V.\} and K. Norrman and I. Chorkendorff and T. Jacobsen and M. Mogensen",

note = "Funding Information: This work is a part of Jens H{\o}gh's Ph.D.-project and is sponsored by the Danish Technical Research Council (STVF) throughout the project period. This work was further supported financially by The Programme Commission on Sustainable Energy and Environment , The Danish Council for Strategic Research, via the Strategic Electrochemistry Research Center (SERC) ( www.serc.dk ), contract no. 2104-06-0011 .",

year = "2013",

doi = "10.1016/j.ssi.2012.12.015",

language = "English",

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T1 - High purity H2/H2O/Ni/SZ electrodes at 500 C

AU - Høgh, J.

AU - Hansen, K. V.

AU - Norrman, K.

AU - Chorkendorff, I.

AU - Jacobsen, T.

AU - Mogensen, M.

N1 - Funding Information: This work is a part of Jens Høgh's Ph.D.-project and is sponsored by the Danish Technical Research Council (STVF) throughout the project period. This work was further supported financially by The Programme Commission on Sustainable Energy and Environment , The Danish Council for Strategic Research, via the Strategic Electrochemistry Research Center (SERC) ( www.serc.dk ), contract no. 2104-06-0011 .

PY - 2013

Y1 - 2013

N2 - The performance of SOFC (solid oxide fuel cell) anodes is influenced negatively by impurities. In the present study segregation of impurities is minimized by using high purity materials at relatively low temperatures to prevent fast segregation. Ni point electrodes on polished single crystals of stabilized zirconia (SZ) with 10, 13 and 18 mol% yttria and one with 6 mol% scandia plus 4 mol% yttria were studied at open circuit voltage at 400-500 C in mixtures of H2/H2O over 46 days. The polarization resistances (Rp) for all samples increased significantly during the first 10-20 days at 500 C. No effect of the electrolyte composition on R p was found. Surface sensitive techniques were used to analyze the composition of the nickel and the electrolytes before and after the electrochemical experiment. Impurities were found to segregate to the surfaces/interfaces, and they are believed to impede the electrode processes and hence to cause the increase in polarization resistance.

AB - The performance of SOFC (solid oxide fuel cell) anodes is influenced negatively by impurities. In the present study segregation of impurities is minimized by using high purity materials at relatively low temperatures to prevent fast segregation. Ni point electrodes on polished single crystals of stabilized zirconia (SZ) with 10, 13 and 18 mol% yttria and one with 6 mol% scandia plus 4 mol% yttria were studied at open circuit voltage at 400-500 C in mixtures of H2/H2O over 46 days. The polarization resistances (Rp) for all samples increased significantly during the first 10-20 days at 500 C. No effect of the electrolyte composition on R p was found. Surface sensitive techniques were used to analyze the composition of the nickel and the electrolytes before and after the electrochemical experiment. Impurities were found to segregate to the surfaces/interfaces, and they are believed to impede the electrode processes and hence to cause the increase in polarization resistance.

KW - Anode

KW - Impurities

KW - SOFC

UR - https://www.scopus.com/pages/publications/84872909612

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DO - 10.1016/j.ssi.2012.12.015

M3 - Article

AN - SCOPUS:84872909612

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VL - 234

SP - 11

EP - 18

JO - Solid State Ionics

JF - Solid State Ionics

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