半金属二原子催化剂的通用合成,用于高效的氧气减少电催化
Yuechao Yao1, Tao Jiang1, Sung Yul Lim2
1Department of Environmental and Resource Engineering, Technical University of Denmark, Miljøvej 115, Kgs. Lyngby, 2800, Denmark.
研究人员使用简单的固态方法开发了新的,低成本的二原子电催化剂 (M, Zn─N─C). 这些催化剂显示出优异的氧降解反应性能和储能应用的潜力.
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:
- 开发高效,低成本,无贵金属的电催化剂对于能源转换和储存技术至关重要.
- 氧降解反应 (ORR) 电催化剂是燃料电池和金属空气电池的关键组件.
研究的目的:
- 为了合成和表征孤立的半金属二原子M,Zn─N─C (M=Fe,Co,Ni) 电催化剂.
- 研究这些新型催化剂的ORR性能和机制.
- 评估它们在空气电池中的应用.
主要方法:
- 一步式,固态模板辅助合成M,Zn─N─C催化剂.
- 电化学表征,包括半波电位测量.
- 莫斯尔光谱分析催化剂的原子结构.
- 密度函数理论 (DFT) 计算以了解催化机制.
主要成果:
- Fe,Zn─N─C催化剂表现出优越的ORR活性,半波潜力为0.867V与RHE.
- 莫斯巴乌尔光谱显示,在Fe,Zn─N─C中,D2位点 (有色铁,中等旋转状态) 的比例很高.
- DFT计算显示位加速ORR中的O2质子化过程.
- 组装的空气电池实现了最大功率密度为138 mW cm-2和容量为748 mAh g-1.
结论:
- 一系列高效的M,Zn─N─C二原子电催化剂成功制造.
- 固态反应方法为催化剂合成提供了一个可扩展的方法.
- 这些催化剂对ORR和储能应用,特别是空气电池具有显著的前景.
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