Degradation study of a reversible solid oxide cell (rSOC) short stack using distribution of relaxation times (DRT) analysis

Journal Article (2022)
Author(s)

Suhas Niggehalli Sampathkumar (EPFL Switzerland)

Philippe Aubin (EPFL Switzerland)

Karine Couturier (CEA Grenoble)

Xiufu Sun (Technical University of Denmark (DTU))

Bhaskar Reddy Sudireddy (Technical University of Denmark (DTU))

Stefan Diethelm (EPFL Switzerland)

M.D.M. Pérez-Fortes (EPFL Switzerland)

Jan Van herle (EPFL Switzerland)

Research Group
Energy and Industry
Copyright
© 2022 Suhas Niggehalli Sampathkumar, Philippe Aubin, Karine Couturier, Xiufu Sun, Bhaskar Reddy Sudireddy, Stefan Diethelm, Mar Pérez-Fortes, Jan van Herle
DOI related publication
https://doi.org/10.1016/j.ijhydene.2022.01.104
More Info
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Publication Year
2022
Language
English
Copyright
© 2022 Suhas Niggehalli Sampathkumar, Philippe Aubin, Karine Couturier, Xiufu Sun, Bhaskar Reddy Sudireddy, Stefan Diethelm, Mar Pérez-Fortes, Jan van Herle
Research Group
Energy and Industry
Issue number
18
Volume number
47
Pages (from-to)
10175-10193
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Abstract

Reversible solid oxide cells (rSOC) can convert excess electricity to valuable fuels in electrolysis cell mode (SOEC) and reverse the reaction in fuel cell mode (SOFC). In this work, a five – cell rSOC short stack, integrating fuel electrode (Ni-YSZ) supported solid oxide cells (Ni-YSZ || YSZ | CGO || LSC-CGO) with an active area of 100 cm2, is tested for cyclic durability. The fuel electrode gases of H2/N2:50/50 and H2/H2O:20/80 in SOFC and SOEC mode, respectively, are used during the 35 reversible operations. The voltage degradation of the rSOC is 1.64% kh−1 and 0.65% kh−1 in SOFC and SOEC mode, respectively, with fuel and steam utilisation of 52%. The post-cycle steady-state SOEC degradation of 0.74% kh−1 suggests improved lifetime during rSOC conditions. The distribution of relaxation times (DRT) analysis suggests charge transfer through the fuel electrode is responsible for the observed degradation.