绕过Fe-V原子对催化剂的激素生成,用于强大的氧降低和空气电池
Lan Ran1, Yichen Zhang2, Wenming Tong3
1College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China.
Angewandte Chemie (International ed. in English)
|September 4, 2025
概括
一种新的铁碳催化剂 (Fe-V-NC) 避免在氧降解反应 (ORR) 过程中损害活性氧物种 (ROS),显著提高了清洁能源应用中的催化剂活性和稳定性.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 铁--碳 (Fe-N-C) 催化剂是氧降解反应 (ORR) 的有希望的无替代品.
- 然而,在ORR机制中产生的活性氧物种 (ROS) 会降低Fe-N-C的活性和稳定性.
研究的目的:
- 开发一种策略来规避ROS产生并提高Fe-N-C催化剂的性能.
- 设计和合成Fe-V原子对催化剂 (Fe1V1-NC) 以提高ORR活性和稳定性.
主要方法:
- 密度功能理论 (DFT) 引导的催化剂设计.
- 合成具有特定N2Fe-N2-VN2配置的Fe-V原子对催化剂.
- 在0.1M KOH中ORR活性和稳定性的电化学特征.
主要成果:
- Fe1V1-NC 催化剂可实现侧向 O2 吸附和直接 OO 键断裂,避免 ROS 的形成.
- Fe1V1-NC具有较高的ORR发作潜力 (1.02V) 和半波潜力 (0.89V与RHE).
- 在50,000个循环中显示出极少的潜在衰变 (16mV),性能优于Fe-N-C.
- 基于Fe1V1-NC的空气电池显示出高达400小时的耐用性.
结论:
- 一个路径切换策略有效地抑制了ROS生成,提高了ORR性能.
- 铁-V原子对催化剂为高活性和稳定的ORR电催化剂提供了可行的途径.
- 这项工作促进了能源转换的耐用催化系统的发展.
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