在普鲁士蓝色类似物中优化Mn,具有双重氧化还原活性位,以诱导增强的Zn2+储存
Lingqian Ye1, Hao Fu1, Ruirui Cao1
1School of Material Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, Jiangsu, PR China.
Journal of colloid and interface science
|March 14, 2024
概括
普鲁士蓝模拟剂 (Mn-PBA) 为水性离子电池 (AZIB) 提供了增强的性能. 优化的Mn-PBA显示出更好的容量和循环稳定性,解决了当前电池技术的关键局限性.
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:
- 普鲁士蓝模拟器 (PBA) 是水性离子电池 (AZIB) 的有希望的阴极材料.
- 现有的PBA由于有限的活性点和离子去干扰过程中的结构不稳定性,因此具有较低的特定容量和较短的循环寿命.
研究的目的:
- 为了提高AZIBs的PBA的结构稳定性和电化学性能.
- 研究以为基础的PBA (Mn-PBA) 提高性能的机制.
主要方法:
- 使用简单的共同沉方法制造Mn-PBA.
- 通过度梯度策略优化Mn-PBA形态.
- 电化学表征包括循环测试和速率能力测量.
- 现场拉曼和现场技术,以阐明Zn2+反应机制.
主要成果:
- 优化的Mn-PBA-3表现出高可逆的特定容量 (143.5mAh/g在1A/g) 和优异的容量保留 (88.5%在250个循环后).
- Mn-PBA-3在2000次10A/g循环后,表现出显著的长期循环稳定性,达到79.0 mAh/g.
- 建立了一个双重的Zn2+活性中心 (Mn-O和FeCN) 增加了特定容量.
- 一个Zn//Mn-PBA-3电池在0-1.9V窗口内以5A/g进行800次循环后达到99.3 mAh/g.
结论:
- 结构调节的Mn-PBA显著提高了AZIB的性能.
- 优化的Mn-PBA-3阴极为高性能AZIB提供了商业MnO的可行替代品.
- 这项研究为设计用于下一代能源存储的先进PBA提供了宝贵的见解.
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