Abstract
Developing an efficient cathode catalyst material is the most intrinsic requisite to acquire rechargeable Li-O2 batteries with long cycling life and high rate capacity. Here, yolk-shell structured Cu2O spheres were facilely synthesized using a wet-chemistry method with the PEG-500 as the surfactant. As catalyst cathode materials, yolk-shell structured Cu2O spheres show a low discharge/charge potential platform of 1.28 V with current density of 500 mA g−1. Compared with cubic-like Cu2O nanoparticles, yolk-shell structured Cu2O spheres have indicated a long and stable cycling life of 84 cycles with a high current density of 500 mA g−1, and which may be benefited to the porous structure and the large specific surface area. The introduction of Cu2O provides an effective solution to the problem of low round-trip efficiency in the Li-O2 battery.
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Acknowledgements
This work was financially supported by K.C. Wong Magna Fund in Ningbo University, Ningbo natural science fund (Project No. 201701HJ-B01019) and college students of science and technology innovation projects in Zhejiang province (Project No. 2017R405008).
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Qiu, Xy., Liu, Sj. & Xu, Dz. Yolk-shell structured Cu2O as a high-performance cathode catalyst for the rechargeable Li-O2 batteries. J Mater Sci 53, 1318–1325 (2018). https://doi.org/10.1007/s10853-017-1555-y
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DOI: https://doi.org/10.1007/s10853-017-1555-y