Developing high-performance and low-cost electrocatalysts for oxygen reduction reaction (ORR) is still a great challenge for Al–air batteries. Herein, CeO 2, a unique ORR promoter, was incorporated into ketjenblack (KB) supported Co 3 O 4 catalyst. We developed a facile two-step hydrothermal approach to fabricate Co 3 O 4 –CeO 2 /KB as a high-performance ORR catalyst for Al–air batteries. The ORR activity of Co 3 O 4 /KB was significantly increased by mixing with CeO 2 nanoparticles. In addition, the Co 3 O 4 –CeO 2 /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. Co 3 O 4 –CeO 2 /KB favored a four-electron pathway in ORR due to the synergistic interactions between CeO 2 and Co 3 O 4 . In full cell tests, the Co 3 O 4 –CeO 2 /KB exhibited a higher discharge voltage plateau than CeO 2 /KB and Co 3 O 4 /KB when used in cathode in Al–air batteries.
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Liu et al. (2016) studied this question.
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