重建Fe/Co双原子站点的协调环境,以实现Zn-Air电池的高效氧气电催化
Hengqi Liu1,2, Jinzhen Huang3,4, Kun Feng5
1National Key Laboratory of Laser Spatial Information, Harbin Institute of Technology, Harbin, 150001, China.
Angewandte Chemie (International ed. in English)
|November 14, 2024
概括
新的FeCo-N-C双原子催化剂激活可充电空气电池的晶格氧气机制. 这一突破克服了局限性,实现了高功率密度和长期稳定性.
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
- 催化剂是一种催化剂.
背景情况:
- 具有协调金属位点的双原子催化剂 (DAC) 对于可充电的空气电池 (ZAB) 中的氧减少和演化反应 (ORR/OER) 是至关重要的.
- DAC的性能通常受到吸收进化机制 (AEM) 中的线性缩放关系的限制.
- 晶格氧机制 (LOM) 提供了一个潜在的途径来克服这些局限性,但需要在金属中心特定的氧气配置,这是很难实现的.
研究的目的:
- 设计能够激活晶格氧机制 (LOM) 的双原子催化剂,以提高可充电空气电池的性能.
- 为了克服吸收进化机制 (AEM) 中线性缩放关系所造成的局限性.
- 通过催化剂重建来证明LOM激活的可行性.
主要方法:
- 定制FeCo-N-C双原子催化剂的合成.
- 在操作条件下 (在平面外和在平面内) 对催化剂重建的研究.
- 电化学描述ORR/OER活动和ZAB性能.
- 在金属中心形成轴向和桥梁氧物种的分析.
主要成果:
- 量身定制的FeCo-N-C催化剂经过重建,形成轴向和桥梁氧物种,使LOM通路的激活成为可能.
- 量身定制的催化剂中缩短的Fe-N键也促进了氧降解反应 (ORR).
- 组装的可充电ZAB实现了332 mW cm-2的峰值功率密度,并保持了超过720小时的稳定性.
结论:
- 设计的FeCo-N-C双原子催化剂可以通过受控的重建成功激活晶格氧机制 (LOM).
- 这种LOM激活途径克服了AEM的缩放限制,从而改善了催化活性.
- 开发的催化剂代表了高性能和耐用的可充电空气电池的有希望的进步.
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