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通过合氧空隙和Fe─C键的功能来居住无活跃过渡,从而实现铁基阳极的长周期寿命

Hongguang Fan¹, Jinyue Song¹, Yanpeng Wang¹

¹Institute of Materials Science and Engineering, Ocean University of China, Qingdao, Shandong, 266100, P. R. China.

Advanced materials (Deerfield Beach, Fla.)

|July 26, 2023

概括

这项研究引入了用于水性超级电容器的新型Fe@Fe3O4(v) @Fe3C@C纳米粒子. 这些材料克服了容量衰减问题,表现出卓越的循环稳定性和高能量密度,适用于先进的储能应用.

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:

基于铁的电池类型阳极为超级电容器提供了比碳材料更高的容量.
在不对称超级电容器 (ASC) 中的商业应用受到严重的容量色和由于不活跃相位过渡而导致的循环性差的限制.

研究的目的:

开发一种新的基于Fe的阳极材料,以提高特定容量和充/放电率.
为了克服容量减弱并改善ASC的铁基阳极的循环稳定性.

主要方法:

合成富含氧气空隙的Fe@Fe3O4(v) @Fe3C@C纳米颗粒,具有"果子与石头"结构.
使用"氧气"机制来增强材料的性能.
实验和理论分析,以调查电化学性能和稳定性.

主要成果:

Fe@Fe3O4(v) @Fe3C@C阳极表现出增强的特定容量和快速充/放电能力.
无可逆转的相位过渡到无活性 γ-Fe2O3 被氧空缺和 Fe─C 键抑制,改善了循环稳定性 (在 24,000 个循环后保持 93.5%).
使用这种阳极的ASC显示出显著的耐用性 (在38000个循环后保持96.4%) 和高能量密度 (127.6Wh kg-1在981W kg-1上).

结论:

开发的Fe@Fe3O4(v) @Fe3C@C纳米粒子有效地解决了基于铁的阳极的容量色问题.
这种材料可以开发出高稳定性和高能量密度的水性超级电容器和ASC.
独特的结构和"氧气"机制是实现卓越电化学性能和循环寿命的关键.

关键词:

基于Fe的阳极是基于Fe的阳极.C债券是什么意思周期稳定性周期稳定性无法逆转的阶段过渡转变.有空缺的氧气位.

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