在合理设计的Pt1Pd单原子合金催化剂中的电子定位使高性能Li-O2电池成为可能
Erhuan Zhang1, Anqi Dong2, Kun Yin3,4
1Future Battery Research Center, Global Institute of Future Technology, Shanghai Jiao Tong University, Shanghai 200240, China.
Journal of the American Chemical Society
|January 18, 2024
概括
研究人员开发了一种用于氧电池 (LOB) 的新催化剂,使用分散在纳米板中的单原子. 这种Pt1Pd催化剂通过增强氧氧还原动力学,显著提高了电池的性能和寿命.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 氧电池 (LOB) 的能量密度很高,但其电极反应速度很慢.
- 缓慢的氧减少和进化反应阻碍了LOB效率和循环寿命.
研究的目的:
- 开发一种有效的LOB催化剂,克服缓慢的氧化还原动力学.
- 在LOB中研究单原子合金的催化活性.
主要方法:
- 直接合成单原子合金催化剂:单原子精确分散在超薄的六角纳米板 (Pt1Pd).
- 用Pt1Pd阴极对LOB进行电化学测试.
- 密度函数理论 (DFT) 计算以了解反应机制.
主要成果:
- 在0.5A g-1下,Pt1Pd阴极表现出0.69V的超低电位.
- 在600小时的运行过程中观察到微不足道的活动损失.
- DFT计算证实Pt1Pd通过定位电子来增强O2/Li2O2氧化还原对的激活,从而减少能量障碍.
结论:
- 开发的Pt1Pd单原子合金催化剂有效地解决了LOB中缓慢的氧氧还原动力学.
- 这种催化设计策略有望提高LOB性能,并可应用于其他能量存储和转换装置.
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