MOF-template derived hollow CeO2/Co3O4 polyhedrons with efficient cathode catalytic capability in Li-O2 batteries

Hollow porous CeO 2 /Co 3 O 4 polyhedrons with abundant exposed reactive sites were synthesized by MOF template with a simple method, which exhibits efficient performance of cathode catalytic in Li-O 2 batteries. Li-O 2 batteries (LOBs) have been perceived as the most potential clean energy system for fast-growing electric vehicles by reason of their environmentally friendlier, high energy density and high reversibility. However, there are still some issues limiting the practical application of LOBs, such as the large gap between the actual capacity level and the theoretical capacity, low rate performance as well as short cycle life. Herein, hollow CeO 2 /Co 3 O 4 polyhedrons have been synthesized by MOF template with a simple method. And it is was further served as a cathode catalyst in Li-O 2 batteries. By means of the synergistic effect of two different transition metal oxides, nano-sized hollow porous CeO 2 /Co 3 O 4 cathode obtained better capacity and cycle performance. As a result, excellent cyclability of exceeding 140 and 90 cycles are achieved at a fixed capacity of 600 and 1000 mAh/g, respectively. The successful application of this catalyst in LOBs offers a novel route in the aspect of the synthesis of other hollow porous composite oxides as catalysts for cathodes in LOBs systems by the MOF template method.