The Impact of Strong Cathodic Polarization on Ni|YSZ Microelectrodes

K. Kreka*, K. V. Hansen, M. B. Mogensen, K. Norrman, C. Chatzichristodoulou, T. Jacobsen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

This work is a study of the impact of short-term strong cathodic polarization in a Ni|YSZ model system using Ni probes as working microelectrodes in a high temperature scanning probe microscope at 650°C in humidified 9% H2 in N2. Impedance spectroscopy revealed one to three orders of magnitude decrease in the high frequency resistance and four to five orders of magnitude decrease in the low frequency impedance with polarization from −1.06 V to −3.06 V vs E°(O2), indicating introduction of electronic conductivity and expansion of the reaction zone around the Ni microelectrode. The effect on the Ni|YSZ interface included formation of electronic conductance, reaction between Ni and YSZ and accumulation of impurities around the Ni|YSZ contact as verified by conductance scans of the polarized area. Cyclic voltammetry was used to compare three systems with different impurity levels and showed that the presence of silicates reduces the current, i.e. lowers the performance of the electrode reaction.
Original languageEnglish
JournalJournal of the Electrochemical Society
Volume165
Issue number5
Pages (from-to)F253-F263
ISSN0013-4651
DOIs
Publication statusPublished - 2018

Bibliographical note

This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse of the work in any medium, provided the original work is properly cited. [DOI: 10.1149/2.0141805jes]

Cite this

@article{657b315ef675418894cf59f483ff7e1a,
title = "The Impact of Strong Cathodic Polarization on Ni|YSZ Microelectrodes",
abstract = "This work is a study of the impact of short-term strong cathodic polarization in a Ni|YSZ model system using Ni probes as working microelectrodes in a high temperature scanning probe microscope at 650°C in humidified 9{\%} H2 in N2. Impedance spectroscopy revealed one to three orders of magnitude decrease in the high frequency resistance and four to five orders of magnitude decrease in the low frequency impedance with polarization from −1.06 V to −3.06 V vs E°(O2), indicating introduction of electronic conductivity and expansion of the reaction zone around the Ni microelectrode. The effect on the Ni|YSZ interface included formation of electronic conductance, reaction between Ni and YSZ and accumulation of impurities around the Ni|YSZ contact as verified by conductance scans of the polarized area. Cyclic voltammetry was used to compare three systems with different impurity levels and showed that the presence of silicates reduces the current, i.e. lowers the performance of the electrode reaction.",
author = "K. Kreka and Hansen, {K. V.} and Mogensen, {M. B.} and K. Norrman and C. Chatzichristodoulou and T. Jacobsen",
note = "This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse of the work in any medium, provided the original work is properly cited. [DOI: 10.1149/2.0141805jes]",
year = "2018",
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language = "English",
volume = "165",
pages = "F253--F263",
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publisher = "The Electrochemical Society",
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The Impact of Strong Cathodic Polarization on Ni|YSZ Microelectrodes. / Kreka, K.; Hansen, K. V.; Mogensen, M. B.; Norrman, K.; Chatzichristodoulou, C.; Jacobsen, T.

In: Journal of the Electrochemical Society, Vol. 165, No. 5, 2018, p. F253-F263.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - The Impact of Strong Cathodic Polarization on Ni|YSZ Microelectrodes

AU - Kreka, K.

AU - Hansen, K. V.

AU - Mogensen, M. B.

AU - Norrman, K.

AU - Chatzichristodoulou, C.

AU - Jacobsen, T.

N1 - This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse of the work in any medium, provided the original work is properly cited. [DOI: 10.1149/2.0141805jes]

PY - 2018

Y1 - 2018

N2 - This work is a study of the impact of short-term strong cathodic polarization in a Ni|YSZ model system using Ni probes as working microelectrodes in a high temperature scanning probe microscope at 650°C in humidified 9% H2 in N2. Impedance spectroscopy revealed one to three orders of magnitude decrease in the high frequency resistance and four to five orders of magnitude decrease in the low frequency impedance with polarization from −1.06 V to −3.06 V vs E°(O2), indicating introduction of electronic conductivity and expansion of the reaction zone around the Ni microelectrode. The effect on the Ni|YSZ interface included formation of electronic conductance, reaction between Ni and YSZ and accumulation of impurities around the Ni|YSZ contact as verified by conductance scans of the polarized area. Cyclic voltammetry was used to compare three systems with different impurity levels and showed that the presence of silicates reduces the current, i.e. lowers the performance of the electrode reaction.

AB - This work is a study of the impact of short-term strong cathodic polarization in a Ni|YSZ model system using Ni probes as working microelectrodes in a high temperature scanning probe microscope at 650°C in humidified 9% H2 in N2. Impedance spectroscopy revealed one to three orders of magnitude decrease in the high frequency resistance and four to five orders of magnitude decrease in the low frequency impedance with polarization from −1.06 V to −3.06 V vs E°(O2), indicating introduction of electronic conductivity and expansion of the reaction zone around the Ni microelectrode. The effect on the Ni|YSZ interface included formation of electronic conductance, reaction between Ni and YSZ and accumulation of impurities around the Ni|YSZ contact as verified by conductance scans of the polarized area. Cyclic voltammetry was used to compare three systems with different impurity levels and showed that the presence of silicates reduces the current, i.e. lowers the performance of the electrode reaction.

U2 - 10.1149/2.0141805jes

DO - 10.1149/2.0141805jes

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SP - F253-F263

JO - Journal of The Electrochemical Society

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SN - 0013-4651

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