TY - JOUR
T1 - Degradation study of a reversible solid oxide cell (rSOC) short stack using Distribution of Relaxation Times (DRT) analysis
AU - Sampathkumar, Suhas Nuggehalli
AU - Aubin, Philippe
AU - Couturier, Karine
AU - Sun, Xiufu
AU - Sudireddy, Bhaskar Reddy
AU - Diethelm, Stefan
AU - Pérez-Fortes, Mar
AU - Van herle, Jan
PY - 2022
Y1 - 2022
N2 - 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.
AB - 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.
KW - Reversible solid oxide cell
KW - rSOC
KW - Distribution of relaxation times
KW - DRT
KW - rSOC degradation
U2 - 10.1016/j.ijhydene.2022.01.104
DO - 10.1016/j.ijhydene.2022.01.104
M3 - Journal article
SN - 0360-3199
VL - 47
SP - 10175
EP - 10193
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 18
ER -