| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1278352 | International Journal of Hydrogen Energy | 2012 | 8 Pages |
The electrochemical properties of Pr2CuO4 (PCO) electrode screen-printed on Ce0.9Gd0.1O1.95 (CGO) electrolyte were investigated. PCO was synthesized by a solid-state route from the stoichiometric mixture of oxides at 1273 K, 20 h. Thermogravimetric analysis (TGA) of PCO both in air and Ar demonstrated its stability up to 1173 K. X-ray powder diffraction study of the PCO–CGO mixture annealed in air at 1173 K for 100 h did not reveal chemical interaction between materials. The oxygen reduction on porous PCO electrodes applied on CGO electrolyte was studied in a symmetrical cell configuration by AC impedance spectroscopy at OCV conditions at 773–1173 K and pO2pO2 = 10−4–1 atm. Analysis of the data revealed that depending on temperature and oxygen partial pressure different rate-determining steps of the overall oxygen reduction reaction take place. Calculated value of area specific resistance (ASR) of PCO electrode is 1.7 ± 0.2 Ω cm2 at 973 K in air and it is constant after 6 subsequent thermocycles. We have found that oxygen reduction on PCO applied on CGO takes mainly place at the triple-phase boundary (TPB) since Adler–Lane–Steele (ALS) model is not valid. Therefore electrochemical characteristics of PCO electrode can be improved by further optimization of both microstructure of the electrode and electrode/electrolyte interface and PCO can be considered as a promising cathode material for intermediate temperature solid oxide fuel cells (IT-SOFC).
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Pr2CuO4 shows a chemical stability with respect to Ce0.9Gd0.1O1.95 up to 1173 K. ► The electrochemical behavior of Pr2CuO4 electrode was investigated. ► The rate-determining steps of ORR depend on temperature and oxygen partial pressure. ► Electrode resistance of Pr2CuO4 was stable after several thermocycles.
