期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 45, 页码 50433-50445出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c14523
关键词
solid oxide fuel cell; proton-conducting electrolyte; perovskite; B-site substitution; iron; nickel
资金
- National Natural Science Foundation of China [91745203, U1601207]
- Guangdong Innovative and Entrepreneurial Research Team Program [2014ZT05N200]
- Fundamental Research Funds for the Central Universities [2018PY11]
- Chinese Education Ministry Key Laboratory of Resource Chemistry
Transition metal oxides have been used as sintering aids for proton-conducting barium cerate-zirconates, which are promising electrolyte materials for low-temperature solid oxide fuel cells (SOFCs) and high-performance electrochemical membrane reactors. However, the effects of the additives on properties other than the density of the electrolytes have been ignored. Here, we report our findings that transition metal additives also affect the electrical properties, stability, and even catalytic activity of proton-conducting ABO(3)-type perovskites. BaCe0.7Zr0.1Y0.2O3-delta (BCZY) is selected as the basic material, and 2 mol % of Ni1-xFex (x range: from 0 to 1.0) oxides and 4 mol % of FeO1.5 are, respectively, added into BCZY to prepare electrolytes of anode-supported SOFCs. All of the electrolytes with additives can be densified after sintering at 1400 degrees C for 5 h, while BCZY without additive is porous. X-ray diffraction (XRD) spectra show that Ni and Fe are doped into the lattice of BCZY. For the first time, we find a positive function of Fe additive in BCZY that it not only acts as a good sintering aid but also improves the electrical performance and stability of the BCZY electrolyte in CO2 and H2O at reduced temperatures. The cell with the 2 mol % Ni0.5Fe0.5-doped BCZY electrolyte, with an unoptimized cathode, gives a power density of 973 mW cm(-2) at 700 degrees C, 120 mW cm(-2) at 450 degrees C, and 45 mW cm(-2) at 350 degrees C. It operates under a constant current of 800 mA cm(-2) at 650 degrees C for over 200 h, during which the voltage decreases from 0.73 to 0.71 V. A newly discovered densified layer, formed in the cathode during the SOFC operation, may cause the degradation.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据