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-O2电池中的Fe/N/C复合物:研究催化结构和对氧演变反应的活性

Jiang-Lan Shui¹, Naba K Karan, Mahalingam Balasubramanian

¹Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, USA.

Journal of the American Chemical Society

|September 25, 2012

概括

原子分散的铁--碳 (Fe/N/C) 催化剂通过降低过度电位和防止电解质分解,显著改善-氧电池的充电. 这提高了电池的效率和寿命.

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
催化剂是一种催化剂.

背景情况:

氧 (Li-O2) 电池提供高能量密度,但在充电效率和寿命方面面临挑战.
充电期间的氧进化反应 (OER) 是一个关键的步骤,通常受到寄生虫电解质分解的阻碍.
开发高效和稳定的阴极催化剂对于推进O2电池技术至关重要.

研究的目的:

合成原子分散的Fe/N/C复合物作为Li-O(2) 电池的阴极催化剂.
调查Fe/N/C在控制O2电池充电过程中氧气演变反应中的作用.
评估Fe/N/C对电池效率和电解质稳定性的影响.

主要方法:

原子分散的Fe/N/C复合物的合成.
使用Fe/N/C,α-MnO(2)/碳和仅碳的阴极,对Li-O(2) 电池进行电化学表征.
在充电阶段对进化气体的气体分析.
使用传输电子显微镜 (TEM),扫描传输电子显微镜 (STEM),感应合等离子光学发射光谱学 (ICP-OES) 和X射线吸收光谱学 (XAS) 的结构性表征.

主要成果:

与α-MnO(2) /碳和纯碳阴极相比,带有Fe/N/C阴极的Li-O(2) 电池表现出较低的超电位.
充电Fe/N/C阴极只产生氧气,而其他阴极则通过电解质分解产生CO2 .
结构分析证实Fe在碳矩阵中的均分布,Fe由C/N/O元素协调.

结论:

原子分散的Fe/N/C作为Li-O(2) 电池中氧气演变反应的有效催化剂.
Fe/N/C催化剂通过减少过度电位来提高电池效率.
使用Fe/N/C可以通过减轻电解质分解来改善电池寿命.

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