电池(电)
材料科学
兴奋剂
催化作用
锂(药物)
阴极
纳米技术
氧气
化学工程
电极
合理设计
能量密度
储能
动力学
功率密度
化学
光电子学
功率(物理)
工程物理
物理化学
物理
医学
生物化学
有机化学
量子力学
工程类
内分泌学
作者
Ming‐Wei Chao,Kai Zeng,Chengyi Lu,Zhangjing Shi,Jie Guo,Xin Chen,Ruizhi Yang
标识
DOI:10.1016/j.jcis.2023.11.101
摘要
Lithium-oxygen batteries (LOBs) with a theoretical energy density of up to 3500 Wh kg−1 hold a promise for the next-generation high-energy-density batteries. However, the slow oxygen reduction/evolution kinetics at the cathode limits the performance of Li-air batteries. The rational design of efficient catalysts is essential for the improvement of oxygen electrode reaction kinetics. Herein, we report a facile strategy to co-dope N and P atoms simultaneously into Ti3C2Tx (NP-Ti3C2Tx) MXene via an electrostatic self-assembly approach. The co-doped NP-Ti3C2Tx layers expose abundant active sites, providing more space for accommodating the formed Li2O2. Moreover, the N and P co-doping facilitates efficient electron transport in Ti3C2Tx MXene. The LOB with NP-Ti3C2TX catalyst delivers a high discharge capacity of 24,940 mAh/g at 1000 mA g−1. At a cut-off capacity of 1000 mAh/g, this battery runs continuously for 159, 276, 185, and 229 cycles at current densities of 1000, 2000, 3000, and 5000 mA g−1, respectively. Theoretical calculations unveil that N and P co-doping enables lower ηORR and ηOER of only 0.26 V and 0.13 V on Ti3C2Tx MXene, respectively. This work offers a feasible approach for constructing efficient MXene electrocatalysts for Li–air batteries.
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