皮里迪尼-N 调节电子注入调节Fe-N-C 位点上的*OH 吸附,以实现高效的氧降解反应
Qiaoling Xu1, Jinsong Hu1,2, Huiying Yao1
1School of Chemical Engineering, Anhui Provincial Key Laboratory of Specialty Polymers, Anhui University of Science and Technology, Huainan 232001, PR China.
ACS applied materials & interfaces
|July 31, 2024
概括
研究人员使用热解方法开发了先进的铁单原子 (SA) 催化剂,以提高氧降解反应 (ORR) 的效率. 这些催化剂在空气电池及其他领域的应用方面非常有前途.
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:
- 精确控制Fe-N-C位点上氧介质的吸附/脱附能障碍对氧减少反应 (ORR) 催化剂效率至关重要.
- 当前的方法在实现原子分散催化剂的精确控制方面面临挑战.
研究的目的:
- 开发一种新的合成策略,用于制造高效的Fe单原子 (SA) 催化剂.
- 调查负责提高ORR性能的潜在机制.
- 探索这些催化剂在像Zn-空气电池这样的储能装置中的潜力.
主要方法:
- 一种含的聚合物的热解,以在基-N丰富的碳矩阵中产生Fe SAs.
- 电化学表征以评估ORR性能,包括半波潜力和限制电流密度.
- 自制Zn-空气电池的制造和测试,以评估催化剂的性能和稳定性.
- 理论计算以阐明二含量和电子转移的作用.
主要成果:
- 合成的Fe SA催化剂表现出优越的ORR性能,半波电位为0.941V,极限电流密度为5.72mA/cm2.
- 使用这些催化剂的气电池表现出高的特定容量 (720 mAh/gZn),峰值功率密度 (253 mW/cm2) 和长期稳定性.
- 理论分析表明,增加的pyridinic-N促进了电子转移到Fe位点,优化了OH物种的吸附能量屏障.
结论:
- 开发的热解方法通过微调电子结构和中间吸附有效地产生具有增强ORR活性的Fe SAs.
- Fe SA 催化剂显示出高性能 Zn-空气电池的巨大潜力.
- 这种多功能合成方法适用于其他过渡金属SAS (Co,Ni,Cu),为先进的原子分散催化剂系统铺平了道路.
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