析氧
电催化剂
电化学
分解水
电解质
无机化学
塔菲尔方程
碳纤维
法拉第效率
电极
石墨烯
作者
Chang Wu,Yuyang Hou,Jicheng Jiang,Haipeng Guo,Hua-Kun Liu,Jun Chen,Jiazhao Wang
标识
DOI:10.1016/j.jpowsour.2020.228317
摘要
Abstract 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.
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