The large over-potential during the battery operation is a great obstacle for the application of Li-O 2 batteries. The porous structure and electrical conductivity of the electrocatalysts are significant for the electrocatalytic performance of Li-O 2 batteries. In this work, a porous Co 3 O 4 /GN nanocomposite (Co 3 O 4 nanorods anchored on graphene nanosheets) is prepared via a facile hydrothermal method assisted with heat treatment. The unique structure of Co 3 O 4 /GN endows efficient electrocatalystic activity for Li-O 2 batteries. In comparison to the Co 3 O 4 , the Co 3 O 4 /GN demonstrates a better cycle performance showing more than 40 cycles with a 1500 mAh g −1 capacity limit strategy at a current density of 300 mA g −1 , and a reduced over-potential of 110 mV at high current density (1200 mA g −1 ). The Co 3 O 4 /GN also displays a high initial specific capacity (7600 mAh g −1 ) and a good reversibility in full cycle with a coulombic efficiency of 99.8% in the first cycle. The impressed cyclability, specific capacity, rate performance, and low over-potentials indicate that the as-prepared Co 3 O 4 /GN nanocomposite is a promising catalyst candidate for reversible Li-O 2 batteries.
Yuan, M., Yang, Y., Nan, C., Sun, G., Li, H., & Ma, S. (2018). Porous Co 3 O 4 nanorods anchored on graphene nanosheets as an effective electrocatalysts for aprotic Li-O 2 batteries. Applied Surface Science, 444, 312–319. https://doi.org/10.1016/j.apsusc.2018.02.267