Oxygen Mobility in Microwave Sintered Praseodymium Nickelates-Cobaltites and Their Nanocomposites with Y-Doped Ceria
Conference attendances
| Language |
Английский |
| Participant type |
Oral |
| URL |
http://www.fmnt.ff.vu.lt/programme/ |
| Conference |
Functional Materials and Nanotechnologies Conference (FM&NT-2015)
05-08 Oct 2015
,
ConferenceType.INTERNATIONAL_CONFERENCE, Vilnius
|
| Authors |
Sadykov Vladislav Aleksandrovich
1,2
, Eremeev Nikita Fedorovich
1
, Bolotov Vasiliy Aleksandrovich
1
, Tanashev Yury Yurʹevich
1
, Fedorova Yuliya E.
1,3
, Amanbaeva Dajana Galy'movna
1,4
, Bobin Alexey Sergeyevich
1,2
, Sadovskaya Ekaterina Mikhajlovna
1
, Muzykantov Vitalij Stepanovich
1
, Pelipenko Vladimir Valerʹevich
1
, Lukashevich Anton Igorevich
1
, Krieger Tamara Andreevna
1
, Ishchenko Arcady Vladimirovich
1,2
|
| Affiliations |
| 1 |
Boreskov Institute of Catalysis SB RAS
|
| 2 |
Novosibirsk State University
|
| 3 |
Novosibirsk State Pedagogical University
|
| 4 |
Novosibirsk State Technical University
|
|
PrNi1-xCoxO3-δ – Ce0.9Y0.1O2-δ composites are promising as IT SOFC cathodes provided their sintering conditions are optimized [1]. In this work effect of microwave sintering (MS) on properties of such materials is studied.
Perovskite (P) PrNi0.5Co0.5O3-δ (PNC) and fluorite (F) Ce0.9Y0.1O2 (YDC) oxides were synthesized by Pechini route. PNC-YDC composites were prepared by ultrasonic dispersion. Pellets were sintered at 870 – 1100 °C using specially designed microwave set-up. Samples were characterized by XRD and TEM with EDX. Oxygen mobility was estimated by O2 TPD and oxygen isotope heteroexchange with 18O2 and C18O2.
MS provides dense materials (porosity < 10 %) even at the lowest temperatures. PNC is single-phase P. Composites are comprised of P+F phases with Pr6O11 admixture, strong elements redistribution between P and F domains occurs (Figure 1). The total amount of oxygen desorbed is up to 20 monolayers for PNC and 70 monolayers for PNC–YDC, being ~ 1.5 times higher as compared to conventionally sintered (CS) samples. This is due to a higher disordering of P and F domains as well as their boundaries. The oxygen isotope exchange is characterized by R2 mechanism with the surface exchange constant kex ~10 6 cm/s and the oxygen tracer diffusion coefficient DO ~10 8 cm2/s at 700 °C (Table 1), being close to CS samples made at higher temperatures [1].
Hence, MS at lower temperatures provides even better functional characteristics of PNC-YDC nanocomposite cathodes.