不对称协调调节单原子铁催化剂中的D-轨道旋转电子填充,以有效减少氧气
Yizhe Li1, Hao Sun1, Longtao Ren1
1State Key Laboratory of Chemical Resource Engineering, Beijing Advanced Innovation Center for Soft Matter Science Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China.
研究人员通过将氧气引入协调中,优化了氧降解反应 (ORR) 的单原子铁碳 (Fe-N-C) 催化剂. 这种Fe-N/O-C催化剂显著提高了能源设备的ORR活动和性能.
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:
- 单原子Fe-N-C催化剂对氧降解反应 (ORR) 是有前途的,但需要提高内在活性.
- 了解和调节Fe-N-C催化剂的电荷配置对于提高ORR性能至关重要.
研究的目的:
- 在单原子催化剂中开发一种优化d轨道旋电子填充Fe位点的策略.
- 研究和氧 (Fe-N/O-C) 协调对ORR活动和能源设备性能的影响.
主要方法:
- 准备一个单原子Fe催化剂与协调N和O (Fe-N/O-C) 和相邻的缺陷.
- 电化学描述ORR活动,包括半波潜力和动力电流密度.
- 空气电池和质子交换膜燃料电池的性能评估.
- 理论研究和现场电化学拉曼光谱分析电荷再分配和电子结构.
主要成果:
- 与Fe-N-C和商业Pt/C相比,Fe-N/O-C催化剂显示出明显增强的ORR活性.
- 实现了更积极的半波电位 (0.927 V) 和更高的ORR动力电流密度.
- 在Zn-空气电池中达到490 mW cm−2的峰值功率密度,在质子交换膜燃料电池中达到1179 mW cm−2.
- 理论和实验结果表明电荷再分配和Fe-N/O-C中d频段中心的负移,优化ORR中间吸附.
结论:
- 引入非对称的第一协调外,如N和O协调,是单原子催化剂的可行策略.
- 微调协调环境有效优化电子结构并增强催化活性.
- 这种方法为先进的单原子催化剂的合理设计和实际应用提供了新的方向.
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