在中高温PEMFC膜中增强水合稳定性和质子传输2
Shuai Quan1, Zheng Sun1, Cong Feng1
1School of Materials Science and Engineering, Tongji University, Shanghai 201804, China.
纳/SiO2复合膜增强中高温燃料电池的水合和质子运输. 纳菲昂/SiO2-3膜在120°C显示出优越的导电性和性能,提高了燃料电池的效率.
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
- 聚合物科学 聚合物科学
背景情况:
- perfluorosulfonic acid (PFSA) 膜由于脱水而在高温下呈现导电性衰变,限制了它们在中高温质子交换膜燃料电池 (MHT-PEMFC) 中的使用.
- 提高水合稳定性和质子传输对于推动PFSA膜技术在苛刻的燃料电池应用中至关重要.
研究的目的:
- 开发和描述Nafion/SiO2复合膜,以提高在高温下水化稳定性和质子导电性.
- 研究SiO2增强PFSA膜中的结构-财产-运输关系.
主要方法:
- 使用不同SiO2填充剂含量的sol-gel辅助造策略制造Nafion/SiO2复合膜.
- 用光谱和显微分析 (例如FTIR,TEM) 来描述材料分散和界面相互作用.
- 热重力测量分析 (TGA) 用于评估水留.
- 在受控的湿度和温度条件下 (高达120°C,50%RH) 测量质子导电性.
- 单燃料电池测试,以评估在MHT-PEMFC条件下的性能.
主要成果:
- 在Nafion矩阵内实现了SiO2的均纳米扩散,具有强大的界面键稳定水合离子域.
- 与原始的Nafion 117.7相比,Nafion/SiO2-3膜表现出优越的保留水和显著增强的质子导电性 (61.9 mS·cm-1在120°C,50%RH).
- 单细胞测试显示,Nafion/SiO2-3膜在MHT-PEMFC条件下导致11.2%更高的开放电路电压和8.9%更高的峰值功率密度.
结论:
- 控制的SiO2纳米颗粒的纳入有效地提高了PFSA膜的水化稳定性和质子传输特性.
- 开发的Nafion/SiO2复合膜显示出在延长PEMFCs的运行温度窗口方面显著的前景.
- 这项工作建立了清晰的结构-财产-运输相关性,突出了无机改造作为先进燃料电池膜的可行策略.
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