Life testing of Ni-YSZ fuel electrodes under electrolysis, fuel cell, and current switching operation

Q. Liu, H. Wang, D. Kennouche, C. Riscoe, D. Butts, S. A. Barnett

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

An electrode supported Ni-YSZ/YSZ/Ni-YSZ symmetric cell was studied in life tests with constant current and switching current operation. At a current density of 0.2 A/cm2, there was no evidence of degradation. The cell electrochemical performance degraded slightly during life tests at current densities ≥ 0.8 A/cm2, with the ohmic resistance increasing and polarization resistance decreasing. The electrode/electrolyte interface structure was found to be seriously degraded after the life tests, with the formation of interfacial voids. In addition, grain boundary voids were observed within the YSZ electrolyte, especially after constant current operation. These observations presumably explain the observed electrolyte resistance increase. Both Ni and YSZ nanoparticles were observed in the electrode functional layers after life tests, possibly explaining the decrease of polarization resistance.

Original languageEnglish (US)
Title of host publicationECS Transactions
EditorsT. Kawada, S. C. Singhal
PublisherElectrochemical Society Inc.
Pages3179-3188
Number of pages10
Edition1
ISBN (Electronic)9781607685395
DOIs
StatePublished - May 30 2017
Event15th International Symposium on Solid Oxide Fuel Cells, SOFC 2017 - Hollywood, United States
Duration: Jul 23 2017Jul 28 2017

Publication series

NameECS Transactions
Number1
Volume78
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Other

Other15th International Symposium on Solid Oxide Fuel Cells, SOFC 2017
CountryUnited States
CityHollywood
Period7/23/177/28/17

ASJC Scopus subject areas

  • Engineering(all)

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