在单晶金属有机框架中的PbO7节点的轨道合增强了Li-O2电池电催化
Yin Zhou1, Qianfeng Gu2, Yinger Xin3
1School of Materials Science and Engineering, Peking University, Beijing 100871, China.
Nano letters
|November 9, 2023
概括
研究人员开发了一种具有PbO7节点的新型金属有机框架 (MOF),提高氧 (Li-O2) 电池的性能. 这种MOF显著改善了充放电动力学和循环寿命.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 在金属有机框架 (MOF) 中优化金属中心是氧 (Li-O2) 电池性能的关键.
- 调节-O2电池的过电潜力仍然是一个重大挑战.
研究的目的:
- 为了合成和描述一种新的MOF与PbO7节点,以增强Li-O2电池动力学.
- 调查当地协调环境对电池性能的影响.
主要方法:
- 合成一个单晶MOF (纳甲--MOF,Na-Pb-MOF) 具有PbO7节点.
- 与含有PbO6节点的MOF进行比较 (四甲基--MOF,4OMe-Pb-MOF).
- 对Pb-O键长度和轨道合的分析,以了解催化机制.
主要成果:
- 在Na-Pb-MOF中的PbO7节点表现出与4OMe-Pb-MOF中的PbO6相比,Pb-O键长度增加.
- 这种结构变化导致较弱的Pb 5d-O 2p轨道合,优化中间吸附.
- 使用Na-Pb-MOF催化剂的-O2电池显示出低超电位 (0.52V) 和长周期寿命 (140个周期).
结论:
- 在Na-Pb-MOF中优化的协调环境有效地提高了Li-O2电池的反应动力学.
- 这种MOF为先进的Li-O2电池应用提供了一个有前途的电催化剂.
- 对MOF的结构调整是改进储能器件的可行策略.
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