协调Fe-Sn双原子位点的协同电子相互作用:一种有效的氧降解反应电催化剂
Vimal Krishnamoorthy1,2,3,4, Palani Sabhapathy2,3, Puttikam Raghunath5
1Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei, 10607, Taiwan.
Small methods
|January 29, 2024
概括
这项研究引入了一种新的基于铁和锡的双原子位点催化剂 (Fe-Sn-N/C),可以显著提高氧降解反应 (ORR) 的活性和耐用性. 在性条件下,新催化剂的性能优于和其他单原子催化剂.
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:
- 双原子位点催化剂 (DAS) 是氧减少反应 (ORR) 催化的一个有希望的领域.
- 提高DAS的活性和耐用性仍然是一个关键的挑战.
研究的目的:
- 为ORR合成和评估一种新的协调铁和锡基DAS (Fe-Sn-N/C).
- 研究双原子位点的协同效应以及P块元素对d块金属的影响,以提高ORR性能.
主要方法:
- 在碳基上合成协调铁和锡基DAS (Fe-Sn-N/C).
- 对ORR活性催化剂的电化学表征,包括半波电位测量.
- 使用扫描电子传输显微镜和X射线吸收光谱学的高级表征.
- 理论计算以了解电子结构和反应机制.
主要成果:
- 在性介质中,Fe-Sn-N/C催化剂表现出0.92 V的高ORR半波潜力 (E1/2),超过了Pt/C,Fe-N/C和Sn-N/C.
- 显微镜证实了N-化碳网络上的原子分散的Fe和Sn位点.
- 谱学揭示了Fe和Sn之间的电荷转移,表明了协同效应.
- 实验和理论数据表明,Sn诱导电荷再分配,削弱中间结合并促进ORR活动.
结论:
- 与最先进的催化剂相比,开发的Fe-Sn-N/C催化剂表现出优越的ORR活性和耐用性.
- 在DAS结构中Fe和Sn之间的协同相互作用对于提高催化性能至关重要.
- 这项工作突出了在DAS中组合P块和d块元件的潜力,以实现高效的电催化.
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