Increase of anode performance of SOFC by reverse current treatment

D. Klotz, B. Butz, A. Leonide, D. Gerthsen, E. Ivers-Tiffée

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

Abstract

The electrochemistry in the anode functional layer is still one of the performance limiting factors for the standard planar anode-supported SOFC (ASC). In this contribution we present an effective method for the improvement of anode performance. It is based on a short-time application of a high current density in reverse direction (reverse current treatment, RCT). The measured impedance data sets show a progressive decrease of the overall area specific polarization resistance (ASRpol), when the ASC is exposed to a series of RCT. By the application of an appropriate electrochemical model, the change in ASRpol could be attributed to the electrochemical polarization loss in the anode functional layer (AFL), which was reduced by 40 %. Post-test analysis with FIB/SEM revealed the formation of a nanoscaled and highly porous Ni/YSZ layer between electrolyte (YSZ) and anode (Ni/YSZ). The hereby increased length of the electrochemically active triple phase boundary (TPB) is regarded to be the cause for this distinct improvement.

Original languageEnglish
Title of host publicationIonic and Mixed Conducting Ceramics 7
Pages141-150
Number of pages10
Edition11
DOIs
Publication statusPublished - 2010
Externally publishedYes
EventIonic and Mixed Conducting Ceramics 7 - 217th ECS Meeting - Vancouver, BC, Canada
Duration: Apr 25 2010Apr 30 2010

Publication series

NameECS Transactions
Number11
Volume28
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Conference

ConferenceIonic and Mixed Conducting Ceramics 7 - 217th ECS Meeting
CountryCanada
CityVancouver, BC
Period4/25/104/30/10

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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