Author: Hua, B.; Zhang, Y.-Q.; Yan, N.; Li, M.; Sun, Y.-F.; Chen, J.; Li, J.; Luo, J.-L.
Description: The efficiencies of a number of electrochemical devices (e.g., fuel cells and metal-air batteries) are mainly governed by the kinetics of the oxygen reduction reaction (ORR). Among all the good ORR catalysts, the partially substituted double perovskite oxide (AA′
B2O5+ δ) has the unique layered structure, providing a great flexibility regarding the optimization of its electronic structures and physicochemical properties. Here, it is demonstrated that the double perovskite oxide, i.e., NdBa0.75Ca0.25Co1.5Fe0.5O5+δ, is a good ORR catalyst at both room and elevated temperatures. Under ambient condition, its half-wave potential of ORR in alkaline media is as low as 0.74 V versus RHE; at 650 °C, the cathodic polarization resistance is merely 0.0276 Ω Ω cm2 according to a symmetric cell measurement, whereas the solid oxide fuel cells using this cathode exhibit a maximum power density of 1982 mW cm−2. From various materials characterizations, it is hypothesized that its excellent ORR activity is strongly correlated with the crystallographic, electronic, and defect structures of the materials.
Subject headings: Electrochemical devices; ORR
Publication year: 2016
Journal or book title: Advanced Functional Materials
Volume: 26
Issue: 23
Pages: 4106-4112
Find the full text : http://onlinelibrary.wiley.com/doi/10.1002/adfm.201600339/full
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Type: Journal Article
Serial number: 1410