使用离子液体改善ZnO的热电功率因子
Md Mahmudur Rahman1, Lourdes Márquez-García1, Guillem Montaña-Mora2
1Universitat Jaume I, Av. Vicent Sos Baynat s/n, Castelló de la Plana 12003, Spain.
概括
热电材料将热量转化为电力. 使用有孔的Ag-ZnO复合材料的离子液体通过提高电导率显著改善了功率因子,展示了一种新的能量收集策略.
科学领域:
- 材料科学 材料科学 材料科学
- 收集能源 收集能源
- 固态物理 固态物理
背景情况:
- 热电 (TE) 材料将废热转化为电力,提供可持续的能源采集解决方案.
- TE材料的关键性能指标包括功率系数 (PF),这取决于Seebeck系数 (S) 和电导率 (σ),以及热导率.
- 之前的研究表明,使用液体电解质在多孔SnO2中增强PF,但由于固体固有的特性而受到限制.
研究的目的:
- 为了提高高性能多孔热电氧化物,Ag-ZnO复合物的功率因子,使用离子液体作为电解质.
- 调查不同离子液体,特别是1--3-甲基化 (BMII) 和1--3-甲基化二-三甲基化 (BMITFSI) 对Ag-ZnO的热电特性的影响.
- 阐明热电特性观察到的变化背后的机制.
主要方法:
- 制造多孔的Ag-ZnO复合热电材料.
- 与不同的离子液体 (BMII和BMITFSI) 接触多孔的Ag-ZnO.
- 热电特性 (Seebeck系数,电导率,功率因子) 和材料结构 (SEM,XRD,阻抗光谱) 的表征.
主要成果:
- 与BMII接触的Ag-ZnO复合材料在Seebeck系数的最小变化下,电导率增加了70.2%,使功率因子提高了1.46倍.
- 与BMITFSI联系的样本显示功率因子的变化微不足道.
- 实验分析表明,与BMII接触的样品中增强的电导率是由于Ag-ZnO氧化物中载体度的增加,这归因于离子的电子注入.
结论:
- 使用电解质来增强功率因子的策略对于像Ag-ZnO这样的高性能热电氧化物是有效的.
- 离子液体,特别是BMII,可以解通常相反相关的Seebeck系数和电导率,从而显著改善功率因子.
- 这项研究验证了用电解质增强的热电氧化物在高效的能源采集应用中的潜力.
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