TY - JOUR
T1 - Understanding the oxygen reduction reaction in the hierarchically oriented composite cathode with open, straight pores
AU - Chen, Xi
AU - Yu, Na
AU - Bello, Idris Temitope
AU - Zhang, Dong
AU - Zhou, Jian
AU - Wang, Yao
AU - Ni, Meng
AU - Liu, Tong
N1 - Funding Information:
This work was supported by National Natural Science Foundation of China ( U21A20317 ), the National Key Research and Development Program of China ( 2022YFA1504701 ), the Fundamental Research Funds for the Central Universities (2042022gf0002), and the start-up research funds from Wuhan Institute of Technology (K202201).
Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2023/11/15
Y1 - 2023/11/15
N2 - The cathode-supported solid oxide fuel cells (SOFCs) have recently attracted great attentions due to the unique advantages of excellent fuel gas utilization and superior thermal reduction stability, but the commercialization process is limited by the poor oxygen reduction reaction (ORR) catalytic performance of low porosities and reduced three phase boundaries (TPBs) cathode substrate. In this case, a novel phase inversion tape casting technology (PITC), have been successfully applied and fabricated an advanced full ceramic bilayer composite cathode support (Sr2Fe1.5Mo0.4Ni0.1O6-δ (SFMNi) – Gd0.2Ce0.8O1.9 (GDC) support/ functional layer) with open, straight pores. The hierarchically oriented pores can be well-kept after high temperature sintering, which significantly enhance the gas (O2) diffusion process in the porous electrode, thus greatly minimizing even eliminating the concentration resistance. Moreover, the introduction of cathode functional layer remarkably enlarges the TPBs density, which is the active sites for ORR, thereby dramatically reducing the electrochemical activation polarization impedance. The full ceramic cathode support exhibits enhanced ORR kinetics activity with a favorable long-term operational stability, indicating that it is an optimized potential cathode support with great application prospects for SOFCs.
AB - The cathode-supported solid oxide fuel cells (SOFCs) have recently attracted great attentions due to the unique advantages of excellent fuel gas utilization and superior thermal reduction stability, but the commercialization process is limited by the poor oxygen reduction reaction (ORR) catalytic performance of low porosities and reduced three phase boundaries (TPBs) cathode substrate. In this case, a novel phase inversion tape casting technology (PITC), have been successfully applied and fabricated an advanced full ceramic bilayer composite cathode support (Sr2Fe1.5Mo0.4Ni0.1O6-δ (SFMNi) – Gd0.2Ce0.8O1.9 (GDC) support/ functional layer) with open, straight pores. The hierarchically oriented pores can be well-kept after high temperature sintering, which significantly enhance the gas (O2) diffusion process in the porous electrode, thus greatly minimizing even eliminating the concentration resistance. Moreover, the introduction of cathode functional layer remarkably enlarges the TPBs density, which is the active sites for ORR, thereby dramatically reducing the electrochemical activation polarization impedance. The full ceramic cathode support exhibits enhanced ORR kinetics activity with a favorable long-term operational stability, indicating that it is an optimized potential cathode support with great application prospects for SOFCs.
KW - Cathode function layer
KW - Composite cathode
KW - Oxygen reduction reaction
KW - Phase inversion tape casting
KW - Solid oxide fuel cell
UR - https://www.scopus.com/pages/publications/85169932719
U2 - 10.1016/j.seppur.2023.124713
DO - 10.1016/j.seppur.2023.124713
M3 - Journal article
AN - SCOPUS:85169932719
SN - 1383-5866
VL - 325
JO - Separation and Purification Technology
JF - Separation and Purification Technology
M1 - 124713
ER -