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Tailoring the surface of perovskite oxide for enhanced oxygen exchange kinetics

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dc.contributor.author Saher, Saim
dc.contributor.author Shafi ur Rehman
dc.contributor.author Basit, Abdul
dc.contributor.author Noman, Muhammad
dc.contributor.author Zaib, Muhammad Alam
dc.contributor.author Samreen, Ayesha
dc.contributor.author Ali, Shahid
dc.contributor.author Qamar, Affaq
dc.date.accessioned 2019-11-22T10:48:53Z
dc.date.available 2019-11-22T10:48:53Z
dc.date.issued 2016-10-18
dc.identifier.isbn 978-1-5090-3552-6
dc.identifier.uri http://142.54.178.187:9060/xmlui/handle/123456789/1763
dc.description.abstract Nanocrystalline perovskite structured La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) considered as a promising cathode material for solid oxide fuel cells (SOFCs). The performance of LSCF electrode is limited by the transport of oxygen ions at the oxide surface, which is the rate determining step of oxygen reduction reaction (ORR). To enhance the oxygen surface exchange process of LSCF electrode, a composite electrolyte is introduced at the surface, which substantially improves the electrochemical performance. The electrical conductivity relaxation (ECR) technique is used to study the surface exchange kinetics of bare LSCF and coated with a mixture of Ce 0.8 Sm 0.2 O 2-δ (SDC) and La 2 Mo 2 O 9 (LMO) nano-powders in three different weight ratios, SDC:LMO = 0.5:1, 1:1, 1:0.5. The oxygen surface exchange coefficient (kchem) of surface modified specimens were derived by assuming constant oxygen diffusion coefficient (D chem ). The results show that the kchem of LSCF is predominantly affected by the surface coating of SDC-LMO and the average kchem values of SDC-LMO coated LSCF increases by a factor 5 to 10 from 650 °C to 850 °C, respectively. It has been concluded that the high ionic conductive oxide coating improves the surface exchange kinetics of underlying LSCF mixed conducting oxide and consequently enhances the performance of electrochemical devices such as SOFC and oxygen separating membranes. en_US
dc.language.iso en_US en_US
dc.publisher IEEE 2016 International Conference on Emerging Technologies (ICET) en_US
dc.subject Engineering and Technology en_US
dc.subject Nano-powder en_US
dc.subject SOFC en_US
dc.subject Cathode en_US
dc.subject Perovskite oxide en_US
dc.subject Ionic-electronic conductor en_US
dc.subject Electrolyte en_US
dc.subject Surface exchange kinetics en_US
dc.title Tailoring the surface of perovskite oxide for enhanced oxygen exchange kinetics en_US
dc.type Proceedings en_US


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