Co3O4–CeO2/C as a Highly Active Electrocatalyst for Oxygen Reduction Reaction in Al–Air Batteries

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• 作者：Kun Liu ; Xiaobing Huang ; Haiyan Wang ; Fuzhi Li ; Yougen Tang ; Jingsha Li ; Minhua Shao
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：December 21, 2016
• 年：2016
• 卷：8
• 期：50
• 页码：34422-34430
• 全文大小：696K
• ISSN：1944-8252

文摘

Developing high-performance and low-cost electrocatalysts for oxygen reduction reaction (ORR) is still a great challenge for Al–air batteries. Herein, CeO₂, a unique ORR promoter, was incorporated into ketjenblack (KB) supported Co₃O₄ catalyst. We developed a facile two-step hydrothermal approach to fabricate Co₃O₄–CeO₂/KB as a high-performance ORR catalyst for Al–air batteries. The ORR activity of Co₃O₄/KB was significantly increased by mixing with CeO₂ nanoparticles. In addition, the Co₃O₄–CeO₂/KB showed a better electrocatalytic performance and stability than 20 wt % Pt/C in alkaline electrolytes, making it a good candidate for highly active ORR catalysts. Co₃O₄–CeO₂/KB favored a four-electron pathway in ORR due to the synergistic interactions between CeO₂ and Co₃O₄. In full cell tests, the Co₃O₄–CeO₂/KB exhibited a higher discharge voltage plateau than CeO₂/KB and Co₃O₄/KB when used in cathode in Al–air batteries.