氧桥 Fe,Co 双金属二极管促进可充电 Zn-空气电池的可逆氧气电催化
Qixing Zhou1, Wendan Xue1, Xun Cui2
1Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), Carbon Neutrality Interdisciplinary Science Centre/College of Environmental Science and Engineering, Nankai University, Tianjin 300350, People's Republic of China.
研究人员开发了一种新型的氧原子桥接Fe,Co双金属二元催化剂 (FeOCo-SAD),通过增强氧减少和进化反应,显著提高可充电空气电池的性能.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 可充电的空气电池 (ZAB) 具有高储能潜力,但由于缓慢的氧减少反应 (ORR) 和氧演化反应 (OER) 动力学而受到限制.
- 开发高效和耐用的双功能电催化剂对于ZAB的广泛应用至关重要.
研究的目的:
- 设计和合成一种新的氧原子桥接Fe,Co双金属二元催化剂 (FeOCo-SAD).
- 调查催化剂在增强ZABs性电解质中的可逆ORR和OER活性方面的性能.
主要方法:
- 用一个特定的Fe-O-Co-N6活性位点合成FeOCo-SAD.
- 在性介质中ORR和OER性能的电化学表征.
- 在现实的可充电ZAB中测试FeOCo-SAD.
- 理论计算 (例如,DFT) 来阐明催化机制.
主要成果:
- FeOCo-SAD表现出极好的双功能活性,其低电位间隙 (ΔE) 为0.67V (ORR E1/2 = 0.87V,OER超电位 = 310mV在10mA cm-2).
- 催化剂在ZAB中实现了241.24mW cm-2的高峰功率密度.
- 理论计算显示,氧桥促进了电荷再分配,增强了氧激活,优化了中间吸附/脱附.
结论:
- 氧桥式双金属二次体,以FeOCo-SAD为例,在提高ORR和OER的内在活性方面非常有效.
- 这种催化剂设计策略对推进可逆氧电催化和开发高性能ZAB显著有前途.
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