Test and characterization of reversible solid oxide cells and stacks for innovative renewable energy storage

Anne Hauch*, Alexandra Ploner, Sergii Pylypko, Geraud Cubizolles, Julie Mougin

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

Abstract

This work aims at developing a renewable energy storage solution, based on reversible solid oxide cell (rSOC) technology. Firstly, the initially high performing cells were tested as single cells with long-term reversible SOFC/SOEC load cycles as part of the test sequence. Secondly, similar cells were integrated in a stack design optimized for reversible operation at high degrees of utilization. The long-term single cell tests showed significant degradation in galvanostatic test periods during electrolysis but not in fuel cell mode prior to starting the reversible load cycling test part. The degradation diminished during the subsequent rSOC operation of the cells operating at 700 °C, +0.6 (SOFC) and −1.2 A cm−2 (SOEC) at fuel utilization up to 80 % in both modes. The long-term stack tests were conducted applying different switches between SOFC and SOEC modes. Initially, long duration tests (100 h each mode) were performed at pH2O/pH2: 50/50 to investigate effect of the polarisation only. The alternating cycle SOEC/SOFC was repeated over 1800 h of testing. Then stack switched daily from SOEC mode (8 h in pH2O/pH2 : 90/10 at −0.84 A cm−2) to SOFC (16 h in H2 at 0.26 A cm−2) for 500 h. Stack tests included reversible mode operation for up to several thousands of hours.
Original languageEnglish
JournalFuel Cells
Volume21
Issue number5
Pages (from-to)467-476
Number of pages10
ISSN1615-6846
DOIs
Publication statusPublished - 2021
Event24th European Fuel Cell Forum - KKL Lucerne, Virtual event, Switzerland
Duration: 20 Oct 202023 Oct 2020
Conference number: 24

Conference

Conference24th European Fuel Cell Forum
Number24
LocationKKL Lucerne
Country/TerritorySwitzerland
CityVirtual event
Period20/10/202023/10/2020

Keywords

  • Durability
  • Impedance spectroscopy
  • Load cycling
  • Performance
  • Reversible solid oxide cells (rSOC)

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