Open AccessA hierarchical hybrid electrode for rapid oxygen reduction reaction below 800°C
Author(s) -
Fushao Li,
Yingxian Xu,
Shu-Biao Xia,
Jianjun Liu,
Yuxing Yan,
Long Jiang,
Feixiang Cheng
Publication year - 2020
Publication title -
thermal science/thermal science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.339
H-Index - 43
eISSN - 2334-7163
pISSN - 0354-9836
DOI - 10.2298/tsci2004455l
Subject(s) - materials science , cathode , electrolyte , chemical engineering , electrocatalyst , electrode , ionic conductivity , oxygen , oxide , solid oxide fuel cell , ionic bonding , sintering , composite material , electrochemistry , chemistry , ion , metallurgy , organic chemistry , engineering
The 3-D backbones with ionic conductivity are first built by sintering Ce0.8Sm0.2O1.9 silks, then Ca3Co2O6 nanoparticles as electrocatalyst are filled in by infiltrating ionic solution, as a result, a hybrid electrode with hierarchical structure is constructed as the cathode of solid oxide fuel cells. Compared with the single-phase Ca3Co2O6 bulk cathode and common Ca3Co2O6-Ce0.8Sm0.2O1.9 composite one, this hybrid electrode is very active for oxygen reduction reaction. At 800?C, area specific resistance with this cathode is reduced to 0.062 ?cm2, and power density peak with the electrolyte-supported single-cell is promoted to 760 mW/cm2. The superior catalytical activity is attributed to the enlarged area for surface oxygen exchange kinetics and enhanced ionic transport behaviour.