Heterostructured Mo2C–MoO2 as highly efficient catalyst for rechargeable Li–O2 battery

Authors

Chang Wu, University of WollongongFollow
Yuyang HouFollow
Jicheng Jiang, University of WollongongFollow
Haipeng Guo, University of WollongongFollow
Hua-Kun Liu, University of WollongongFollow
Jun Chen, University of WollongongFollow
Jiazhao Wang, University of WollongongFollow

RIS ID

143391

Publication Details

Wu, C., Hou, Y., Jiang, J., Guo, H., Liu, H., Chen, J. & Wang, J. (2020). Heterostructured Mo2C–MoO2 as highly efficient catalyst for rechargeable Li–O2 battery. Journal of Power Sources,

Abstract

© 2020 Elsevier B.V. Li–O2 batteries has been widely investigated for its ultra-high capacity as next generation batteries. Nevertheless, some problems like sluggish kinetic reaction and instability hugely impede the practical use of Li–O2 batteries. In this work, Mo2C/MoO2@RGO heterostructures was fabricated by in-situ growth of Mo2C between MoO2 and RGO during calcination and being employed as cathode to explore the synergistic effect in Li–O2 batteries. As a result, Mo2C/MoO2@RGO exhibits good specific capacity with 2365 mAh g−1, high round-trip efficiency (89% at first cycle) and improved cycling performance. Density functional theory calculations indicated that the Mo2C/MoO2@RGO heterostructures have better capability of oxygen adsorption than sole constituent (Mo2C@RGO or MoO2@RGO), which triggers the formation of film-like amorphous discharge products, leading to lower overpotential and stable performance. Our study reveals the important role of heterostructures in Li–O2 batteries system and demonstrates a promising design strategy for heterostructured catalyst.