Abstract
The electrochemical performance of Pr2NiMnO6 (PNMO)-xCe0.9Gd0.1O1.95 (CGO) (x = 0–40 wt%) composite oxides as intermediate-temperature solid oxide fuel cell (IT-SOFC) cathode materials are evaluated. The electrochemical impedance spectroscopy (EIS) analysis results identify two consecutive electrode processes on the composite cathode. Among the various composites, PNMO-30CGO cathode exhibits the best electrochemical performance with the minimum polarization resistance of 0.23 Ω cm2 and the maximum exchange current density of 75 mA cm−2 at 700 °C in air. These values are almost constant even after 30-h operation. The oxygen reduction reaction (ORR) mechanism studies prove that the major rate-determining step is the charge-transfer process. Introducing CGO significantly improves the charge-transfer process, by increasing the triple phase boundary (TPB) length and oxygen vacancy concentration in the composite cathode.
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The project was supported by National Natural Science Foundation of China (51302069, 51372073), Foundation of Heilongjiang Educational Department (2013TD002), Nature Science foundation of Heilongjiang Province in China (E2016051), Scientific Research Foundation for Returned Scholars, and Ministry of Human Resources and Social Security of People’s Republic of China (2014-240).
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Li, H., Sun, LP., Feng, Q. et al. Investigation of Pr2NiMnO6‐Ce0.9Gd0.1O1.95 composite cathode for intermediate-temperature solid oxide fuel cells. J Solid State Electrochem 21, 273–280 (2017). https://doi.org/10.1007/s10008-016-3364-7
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DOI: https://doi.org/10.1007/s10008-016-3364-7