在含有的多电解质中对氧化运输的理论检查
Sachith Wickramasinghe1, Alexandria Hoehn1, Shehani T Wetthasinghe1
1Department of Chemistry & Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States.
The journal of physical chemistry. B
|November 16, 2023
概括
含有的聚合物是阴离子交换膜 (AEM) 的关键. 这项研究表明,AEM中的氧化物扩散取决于含水量,通道大小和离子相互作用,这对于有效的膜性能至关重要.
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
- 计算化学计算化学
背景情况:
- 具有cobaltocenium组的聚合物对离子交换膜 (AEMs) 是有前途的.
- 这些材料提供了化学稳定性和高离子导电性的平衡.
- 了解离子运输对于AEM性能至关重要.
研究的目的:
- 在模拟 AEM 通道的模型系统中分析氧化扩散.
- 为了研究酸盐对氧化物运输的影响.
- 阐明了限制环境中控制离子扩散的机制.
主要方法:
- 模型系统的分子动力学模拟仅限于一个维度.
- 电子结构计算使用密度功能紧固结合 (DFTB) 方法来获得力.
- 氧化扩散机制的分析 (车载和结构).
主要成果:
- 氧化扩散对道大小和由溶解调节的静电相互作用敏感.
- 车载和结构扩散机制都有所贡献,结构扩散在较低的系数中占主导地位.
- 最佳的扩散发生在中等水密度,其中溶解和重新排列是平衡的.
结论:
- 在基于的AEM中,氧化的扩散是一个复杂的过程,受结构和环境因素的影响.
- 水的密度通过平衡静电相互作用和分子移动性来优化离子运输起着至关重要的作用.
- 进一步的研究应该考虑cobaltocenium分离,方向,修改和核量子效应.
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