在单原子Fe站点和添加碳支之间建造一个轴向电荷转移通道,以促进氧气减少
Jiahao Cheng1, Zheng Zhang1, Jibin Shao1
1College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou, 310014, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|May 28, 2024
概括
引入轴系协调的异原子,如氧在O-Fe-N-C中,显著提高了氧降解反应 (ORR) 的单原子催化剂性能. 这项工作澄清了异原子支相互作用,提高了催化剂的效率.
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Fe─N─C结构的单原子催化剂 (SAC) 对氧降解反应 (ORR) 是有前途的.
- 轴坐标异原子的作用及其与SAC中碳支物的相互作用仍然不太清楚.
- 增强的ORR性能与引入特定的异构原子与Fe位点轴向协调有关.
研究的目的:
- 研究轴坐标异原子 (O,P,S) 对ORR的Fe─N─CSAC的影响.
- 阐明轴向异质原子与石墨含 N 丰富的碳支柱之间的相互作用机制.
- 为轴向协调的SACs制定一个一般的合成策略.
主要方法:
- 使用气相表面处理制备X─Fe─N─C (X = O,P,S) SAC.
- 使用基于同步的X射线吸收近边结构 (XANES) 谱学的表征.
- 电化学评估ORR性能和空气电池容量.
主要成果:
- 在O-Fe-N-C中的轴向氧气协调促进了Fe位点和碳支之间的轴向电荷传输通道.
- -Fe-N-C表现出优越的ORR性能 (0.905V与RHE) 和空气电池容量 (884mAhg-1).
- 与缺乏轴电荷转移和商业Pt/C的催化剂相比,性能得到了提高.
结论:
- 建立了一种可通用的方法来合成轴向异质原子协调的SACs.
- 这项研究提供了有关SAC活动的电子相互作用的关键见解.
- 轴协调,特别是与氧气,显著提高Fe─N─C催化剂的ORR性能.
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