IT SOFC Cathodes Based on Pr Nickelates/Cobaltites: Design and Performance | Sciact - CRIS-system of Boreskov Institute of Catalysis

IT SOFC Cathodes Based on Pr Nickelates/Cobaltites: Design and Performance Full article

Conference

11th European SOFC & SOE Forum
01-04 Jul 2014 , Lucerne

Source

Proceedings of the 11th European SOFC and SOE Forum, 1 - 4 July 2014, Lucerne/Switzerland
Compilation, 2014. ISBN 9783905592160.

Output data

Year: 2014, Article number : B0303, Pages count : 9

Authors

Sadykov Vladislav ^1,2 , Eremeev Nikita ^1,2 , Sadovskaya Ekaterina ^1,2 , Bobin Aleksei ^1,2 , Ishchenko Arkady ^1,2 , Pelipenko Vladimir ^1,2 , Fedorova Yulia ^1,2 , Lukashevich Anton ^1,2 , Salanov Aleksei ^1,2 , Krieger Tamara ^1,2 , Belyaev Vladimir ^1,2 , Rogov Vladimir ^1,2 , Muzykantov Vitalii ^1,2 , Vinokurov Zakhar ^1,2 , Shmakov Aleksandr ^1,2 , Bobrenok Oleg ³ , Uvarov Nikolai ⁴ , Ohlupin Yurii ⁴ , Ulikhin Artem ⁴ , Mertens Josef ⁵ , Vinke Izaak C. ⁵ , Steinberger-Wilckens Robert ⁶ , Watton James ⁶ , Dhir Aman ⁶ , McDonalds Nikkia ⁶

Affiliations

1	Novosibirsk State University
2	Boreskov Institute of Catalysis, Pr. Lavrentieva, 5, 630090 Novosibisk, Russian Federation
3	Institute of Thermal Physics SB RAS, Novosibirsk, Russia
4	Institute of Solid State Chemistry and Mechanical Activation, Novosibirsk, Russia
5	Institute of Energy and Climate Research, Forschungszentrum Julich, Julich, Germany
6	University of Birmingham, Edgbaston, B15 2TT, United Kingdom

This work presents results of research aimed at design of stable to carbonation Sr-free cathodes for IT SOFC based on Pr nickelates/nickelates-cobaltites with perovskite-like (P) structures and their nanocomposites with Y/Gd-doped ceria with fluorite (F) structure. Nanocrystalline fluorites, perovskites PrNi1-xCoxO3-δ (x=0-0.6) and Ruddlesden-Popper oxides Pr2-xNiO4+δ (x=0-0.3) were synthesized by Pechini method. Nanocomposites were prepared via ultrasonic dispersion of F and P powders in isopropanol with addition of polyvinyl butyral followed by sintering at temperatures up to 1300 oC in air. Phase composition, morphology, microstructure and elemental composition of domains in P/F oxides and their nanocomposites were characterized by XRD and HRTEM/SEM with EDX. Oxygen mobility and reactivity were characterized by oxygen isotope exchange (including 18O2 SSITKA), weight loss, unit cell and conductivity relaxation studies. Electrochemical characteristics were estimated for cathodes supported on H.C. Starck half-cells (YDC buffer layer/ thin YSZ electrolyte/NiO/YSZ). P and F domains are nanosized and disordered even in dense nanocomposites due to elements redistribution between phases. This microstructure provides fast oxygen diffusion in such domains and along their interfaces with DO and Dchem at ~600 K exceeding those for LSFC-GDC composites by 2-3 order of magnitude. For optimized composition and microstructure of nanocomposite cathodes, a stable performance in the IT range with maximum power density (Wt/cm2) up to 0.3 (600 oC), 0.6 (700 oC) and 1.0 (800 oC) in wet H2/air feeds exceeding best results for LSFC/GDC cathodes on the same substrates was demonstrated.

Sadykov V. , Eremeev N. , Sadovskaya E. , Bobin A. , Ishchenko A. , Pelipenko V. , Fedorova Y. , Lukashevich A. , Salanov A. , Krieger T. , Belyaev V. , Rogov V. , Muzykantov V. , Vinokurov Z. , Shmakov A. , Bobrenok O. , Uvarov N. , Ohlupin Y. , Ulikhin A. , Mertens J. , Vinke I.C. , Steinberger-Wilckens R. , Watton J. , Dhir A. , McDonalds N.
IT SOFC Cathodes Based on Pr Nickelates/Cobaltites: Design and Performance
In compilation Proceedings of the 11th European SOFC and SOE Forum, 1 - 4 July 2014, Lucerne/Switzerland. 2014. – C.20-28. – ISBN 9783905592160.

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