材料科学
层状结构
催化作用
锂(药物)
化学工程
氧气
电池(电)
纳米技术
电流密度
储能
阴极
化学
复合材料
物理化学
功率(物理)
内分泌学
有机化学
工程类
物理
医学
量子力学
生物化学
作者
Weixin Zhang,Shun Tang,Zhihua Chen,Xiaocui Xiong,Bin Chen,Kai Wu,Guohua Xu,Shijie Cheng,Yuan‐Cheng Cao
标识
DOI:10.1016/j.cej.2021.132489
摘要
Lithium-oxygen (Li-O2) batteries are considered as a new revolutionary energy storage technology due to their ultra-high theoretical energy density, but many problems of cathode restrict their further development. Here, we prepared a free-standing flexible Co-MOF/MXene hybird film for efficient Oxygen reduction reaction (ORR) and as cathode for Li-O2 batteries by inserting 2D Co-MOF nanosheets between MXene layers based on electrostatic self-assembly strategy. The Co-MOF/MXene hybrid film with two-dimensional lamellar structure had high ORR catalytic activity, can provide faster Li+ or O2 expansion channels, promotes the deposition and decomposition of Li2O2, and it also breaks through the traditional concept of slurry method to prepare cathode of Li-O2 batteries. Li-O2 batteries based on Co-MOF/MXene hybird film as cathode had ultra-high capacity (34763 mAh/g at current density of 1000 mA/g), excellent cycle stability (278 cycles, limited capacity of 1000 mAh/g at current density of 1000 mA/g), and outstanding rate performance. Besides, the capacity and cycle performance of Li-O2 batteries can be controlled by adjusting the loading of 2D Co-MOF and the thickness of Co-MOF/MXene hybrid film. The promising results provide insights the construction of air cathode structure for metal-air batteries, the design of efficient catalyst, and greatly expanded the scope of future research.
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