Abstract
Mesoporous cobalt oxides (Co3O4) with different porosities were employed as the electrochemical catalysts of lithium–oxygen batteries. The mesoporous Co3O4 demonstrated significantly improved round-trip efficiency and specific capacity over the bulk catalyst. Moreover, electrochemical measurement results suggest that the highly open and continuous three-dimensional cubic mesoporous structural features of the catalyst are imperative for its much higher catalytic reactivity than the two-dimensional hexagonal mesoporous Co3O4. A capacity close to 2250mAhg−1carbon and a round-trip efficiency of 81.42% were obtained for the mesoporous Co3O4-KIT-6-40 catalyzed air electrode. It is suggested that the mesoporous metal oxide could be a promising catalyst of air electrode for the high performance lithium–oxygen battery.
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