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对于高电流密度Zn-空气电池的等级半孔Mo2C/C的增强氧气动力学
Jun-Ye Zhang1, Chenfeng Xia2, Yaqiong Su3
1Laboratory of Advanced Materials, Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, and State Key Laboratory of Molecular Engineering of Polymers, School of Chemistry and Materials, Fudan University, Shanghai, 200433, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|November 27, 2023
概括
为了提高空气电池的性能,合成了分层的半孔性碳化物/碳微球 (Meso-Mo2C/C). 优化的Meso-Mo2C/C-14材料可实现超高功率密度和高电流密度的长期稳定性.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 高电流密度的空气电池为能源技术提供了巨大的潜力.
- 缓慢的氧反应和扩散动力学目前限制了它们的实际应用.
研究的目的:
- 开发具有可调节碳层厚度的等级性半孔碳化物/碳微球 (Meso-Mo2C/C).
- 为了提高氧气减少和扩散动力学,以提高空气电池的性能.
主要方法:
- 序列组装的等级性介质碳化物/碳微球 (Meso-Mo2C/C-x).
- 材料属性的表征,包括表面积,毛孔大小和组成.
- 空气电池的电化学测试,包括半波潜力,Tafel斜率,功率密度和长期稳定性.
主要成果:
- 优化的Meso-Mo2C/C-14复合材料表现出高表面积 (426 m2 g-1) 和层次的中等孔 (6.9 nm).
- 该材料表现出增强的水友性,加速氧降解动力学,并促进了氧气扩散.
- 介质Mo2C/C-14实现了高半波潜力 (0.88V与RHE) 和低的Tafel斜率 (51 mV dec-1).
- 使用Meso-Mo2C/C-14的空气电池提供了超高功率密度 (272 mW cm-2) 和100小时的稳定性在100 mA cm-2.
结论:
- 层次上介质的Mo2C/C结构有效地解决了空气电池中的动力限制.
- 优化的Meso-Mo2C/C-14材料代表了高性能,高电流密度的空气电池技术的重大进步.
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