Electrode properties of Ln2NiO4 + δ ( Ln = La , Nd , Pr ) AC Impedance and DC Polarization Studies
Electrode properties of Ln2NiO4 + δ ( Ln = La , Nd , Pr ) AC Impedance and DC Polarization Studies
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DOI：
10.1149/1.2207059
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发表时间：
2006-08
影响因子：
3.9
通讯作者：
F. Mauvy;C. Lalanne;J. Bassat;J. Grenier;Hui Zhao;L. Huo;P. Stevens
中科院分区：
文献类型：
--
作者：
F. Mauvy;C. Lalanne;J. Bassat;J. Grenier;Hui Zhao;L. Huo;P. Stevens
The perovskite-type materials, Ln 2 NiO 4+δ , were prepared by a modified Pechini method and their electrochemical properties investigated using ac impedance and dc polarization methods from 300 to 800°C under different oxygen partial pressures. Schouler methodology based on the frequency relaxation has been used to assign different electrochemical processes. A transfer process related to oxygen ions moving between the electrolyte and electrode interface was found in the mixed ionic and electronic conducting electrode/electrolyte system. The study shows that the Nd 1.95 NiO 4+δ compound exhibits promising electrode properties due to its high chemical stability and low polarization resistance. The oxygen diffusion process is the rate-limiting step at low oxygen partial pressure, whereas the charge-transfer process becomes more important at higher oxygen partial pressure.
