通过协同的原子集群相互作用实现异常双功能ORR/OER性能.
Guanyu Chen1, Yihao Liu1, Shuyan Xue1
1Laboratory of Advanced Materials, Shanghai Key Lab of Molecular Catalysis and Innovative Materials, Academy for Engineering & Technology, Fudan University, Shanghai, 200438, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|December 10, 2023
概括
这项研究引入了碳纳米管上的新型Fe纳米集群和单原子位点催化剂,增强了高效的Zn-空气电池的氧气减少和演化反应.
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
- 纳米技术纳米技术
背景情况:
- 单原子位 (SAs) 为氧降解反应 (ORR) 提供高活性,但遭受中间吸附和稳定性问题.
- 金属集群提供稳定性和弱吸附性,但缺乏足够的催化活性点.
研究的目的:
- 合成和研究一个协同框架,将Fe纳米集群和SAS结合在1D碳纳米管 (Fe3C-NCNTs) 上.
- 探索原子集群相互作用及其对电子再分配及其对ORR和氧演化反应 (OER) 催化性能的影响.
主要方法:
- 在1D碳纳米管 (Fe3C-NCNTs) 上合成与SAS结合的Fe纳米集群.
- 使用离轴电子全息学进行表征.
- 使用密度函数理论 (DFT) 计算进行理论验证.
主要成果:
- Fe3C-NCNTs复合物显示出强烈的极化和电子在纳米集群和SAS之间重新分配.
- 电子再分配增强了电子传输和中间吸附,通过实验和理论分析证实了这一点.
- 与没有纳米集群的催化剂相比,ORR的半波潜力增加了75mV,OER增加了133mV.
- 在自制的Zn-空气电池 (ZAB) 中证明了高功率密度和长期稳定性.
结论:
- 协同的Fe纳米集群-SA相互作用有效地提高了ORR和OER的电催化活性.
- 这种方法为设计用于储能应用的双功能电催化剂提供了一个简单的途径,例如ZAB.
- 开发的0D复合结构为先进的催化剂设计提供了一个有希望的策略.
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