期刊
APPLIED ENERGY
卷 238, 期 -, 页码 344-350出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.apenergy.2019.01.094
关键词
Proton conducting solid oxide fuel cells; Co-doping; Cathode; Oxygen reduction reaction; Electrochemical impedance spectroscopy
资金
- National Natural Science Foundation of China [51502001]
- Anhui University [J01006029]
- Research Grant Council from Hongkong SAR [PolyU 152214/17E]
Proton conducting solid oxide fuel cells are solid state electrochemical devices for power generation at a conversion efficiency (>60%) higher than conventional thermal power plants (similar to 40%). The cathode is the key component of proton conducting solid oxide fuel cells as it contributes to more than 50% of the total over-potential loss of an H+-SOFC with thin film electrolyte. This work aims to develop high performance and durable cathode for proton conducting solid oxide fuel cells by doping Ba2+ into the Sr-site of the SrSc0.175Nb0.025Co0.8O3-delta perovskite oxide. The influence of moisture on the catalytic activity of Ba0.5Sr0.5Sc0.175Nb0.025Co0.8O3-delta cathode was investigated using electrochemical impedance spectroscopy of symmetric cell at 600 degrees C. The resistance in the low-frequency range was found to be the rate-limiting step of the oxygen reduction reaction in the dry air, while the resistance in the medium-frequency range became the rate limiting step in the moist air. With a Ba(0.5)Sr(0.5)Sc(0.175)Nb(0.02)5Co(0.8)O(3-delta) cathode, a proton conducting single cell achieved good performance at a temperature of 700 degrees C with a power density of 633 mW cm(-2). However, the performance of single cell decreased with time, probably due to the agglomeration of cathode particles and the coverage of produced water on the active surface. To improve the durability of the proton conducting solid oxide fuel cell, it is critical to minimize the cathode particle agglomeration and remove the produced water effectively. The research results contribute to the development of high-performance fuel cell for efficient energy conversion.
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