The Excellence of Both Worlds: Developing Effective Double Perovskite Oxide Catalyst of Oxygen Reduction Reaction for Room and Elevated Temperature Applications

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• 作者：Bin Hua ; Ya-Qian Zhang ; Ning Yan ; Meng Li ; Yi-Fei Sun ; Jian Chen ; Jian Li and Jing-Li Luo
• 刊名：Advanced Functional Materials
• 出版年：2016
• 出版时间：June 20, 2016
• 年：2016
• 卷：26
• 期：23
• 页码：4106-4112
• 全文大小：1838K
• ISSN：1616-3028

文摘

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′B₂O_5+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., NdBa_0.75Ca_0.25Co_1.5Fe_0.5O_5+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 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.