质子导电有机-无机复合膜用于全氧化回氧流电池
Sooraj Sreenath1,2, Nayanthara P Sreelatha1, Chetan M Pawar1,2
1Electro Membrane Processes Laboratory, Membrane Science and Separation Technology Division, CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar 364002, India.
Membranes
|June 27, 2023
概括
表面修饰的聚乙醇-膜为氧化还原流电池提供了经济高效的替代方案. 这些膜表现出极好的稳定性和性能,在关键指标上表现优于传统选项.
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:
- 流动电池的 perfluorinated 膜面临着电解质扩散的挑战.
- 工程热塑性塑料需要特定的功能来实现最佳导电性和稳定性.
- 需要具有成本效益的,化学惰性的,强大的质子导电膜.
研究的目的:
- 为氧化还原流电池 (VRFB) 开发和评估表面修改的热交联聚乙醇- (PVA-SiO2) 膜.
- 研究不同金属氧化物涂层 (SiO2,ZrO2,SnO2) 对膜特性和VRFB性能的影响.
主要方法:
- 金属氧化物 (SiO2,ZrO2,SnO2) 被涂在PVA-SiO2膜上,使用酸催化溶凝策略.
- 膜氧化稳定性在恶劣的硫酸和瓦纳基离子环境中进行了测试.
- 评估了质子导电性,泽塔潜力和VRFB性能 (库伦比效率,能效,容量衰减,功率密度,自放电).
主要成果:
- 在PVA-SiO2-Si,PVA-SiO2-Zr和PVA-SiO2-Sn膜中显示出极好的氧化稳定性.
- PVA-SiO2-Sn膜表现出最高的导电性和泽塔电位.
- 在VRFB中,与Nafion-117相比,这些膜在200个周期内显示出更高的库伦比效率和稳定的能量效率,具有不同的容量衰变和功率密度.
结论:
- 表面修改的PVA-SiO2膜是VRFB的有希望的替代品,提供更好的稳定性和性能.
- 简单的表面修改技术为设计用于储能设备的先进膜提供了一条途径.
- 特定的金属氧化物选择会影响膜特性和VRFB的操作特性,例如自放电和功率密度.
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