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Sm0.5Sr0.5Co0.4Ni0.6O3−δ–Sm0.2Ce0.8O1.9 as a potential cathode for intermediate-temperature solid oxide fuel cells by Yen-Pei Fu is a Engineering article available to read on EtoBox.

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## Exchange current density Oxygen reduction reaction a b s t r a c t The mixed ionic and electronic conductors (MIECs) of Sm 0.5 Sr 0.5 Co 0.4 Ni 0.6 O 3Àd (SSCN)e Sm 0.2 Ce 0.8 O 1.9 (SDC) were investigated for potential application as a cathode material for intermediate-temperature solid oxide fuel cells (IT-SOFCs) based on an SDC electrolyte. Electrochemical impedance spectroscopy (EIS) technique was performed over the temperature range of 600e850 C to determine the cathode polarization resistance which is represented by area specific resistance (ASR). To investigate the ORR mechanism, the impedance diagram for 70SSCNe30SDC was measured under applied cathodic voltage from E 1⁄4 0.0 to E 1⁄4 À0.3 V. It indicated that the charge transfer dominated the ratedetermining step at the temperature of 600 C; whereas the diffusion or dissociative adsorption of oxygen dominated the rate-determining step at the temperature of 800 C. In this study, the exchange current density (i 0 ) for oxygen reduction reaction (ORR) was determined from the EIS data. The i 0 value of 70SSCNe30SDC/SDC was 187.6 mA cm À2 which is larger than the i 0 value of 160 mA cm À2 for traditional cathode/electrolyte,

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Author

Yen-Pei Fu

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0360-3199)

Published

2010

Language

EN

Field

Engineering (Physical Sciences)