Evaluation of Ca3Co2O6 as cathode material for high-performance solid-oxide fuel cell.
A cobalt-based thermoelectric compound Ca(3)Co(2)O(6) (CCO) has been developed as new cathode material with superior performance for intermediate-temperature (IT) solid-oxide fuel cell (SOFC). Systematic evaluation has been carried out. Measurement of thermal expansion coefficient (TEC), thermal-stress (σ) and interfacial shearing stress (τ) with the electrolyte show that CCO matches well with several commonly-used IT electrolytes. Maximum power density as high as 1.47 W cm(-2) is attained at 800°C, and an additional thermoelectric voltage of 11.7 mV is detected. The superior electrochemical performance, thermoelectric effect, and comparable thermal and mechanical behaviors with the electrolytes make CCO to be a promising cathode material for SOFC.
State Key Laboratory of Material Processing and Die and Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China.
Tao
T
Wei
Yun-Hui
YH
Huang
Rui
R
Zeng
Li-Xia
LX
Yuan
Xian-Luo
XL
Hu
Wu-Xing
WX
Zhang
Long
L
Jiang
Jun-You
JY
Yang
Zhao-Liang
ZL
Zhang