Chongshan Yin , Deyuan Chen , Mengyao Hu , Huihua Jing , Libing Qian , Chunqing He
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引用次数: 0
摘要
当代基于全氟磺酸(PFSA)的质子交换膜(PEM)的最佳工作温度被确定为 60 至 80 °C。然而,在超过这一临界值的温度下工作可带来巨大优势。因此,开发能在高温下保持性能的质子交换膜势在必行。本研究介绍了具有三层结构的新型 SUS 复合质子交换膜。这些膜的特点是中间是 UIO-66-NH2/Nafion 复合层(U),两侧是磺化碳纳米管/Nafion 复合层(S)。SUS PEM 具有更好的质子传导性、长期稳定性、燃料电池效率和气体阻隔性能。值得注意的是,在 145 °C 的高温下,由于保水能力增强,这些膜表现出显著的质子传导性,达到 0.428 S cm-1。在燃料电池评估中,SUS PEM 在 115 °C 的高温下表现出最佳性能(0.940 W cm-2)。这些改进归功于致密的 S 层和 U 层,前者可调节水分子和气体分子的扩散速度,后者则因其较高的截留能力而成为储水层。这些结论通过计算模拟得到了验证,并得到了正电子湮灭光谱的进一步支持。
Composite proton exchange membrane featuring a three-layer structure: Enhanced thermal stability, proton conductivity, and fuel cell performance
The optimal operating temperature for contemporary perfluoro-sulfonic acid (PFSA)-based proton exchange membranes (PEMs) is identified to range from 60 to 80 °C. However, operating at temperatures exceeding this threshold could offer substantial advantages. Therefore, the development of PEMs that can maintain performance at elevated temperatures is imperative. This study introduces novel SUS composite proton exchange membranes with a three-layer architecture. These membranes feature a central UIO-66-NH/Nafion composite layer (U), bordered by sulfonated carbon-nanotubes/Nafion composite layers (S) on both sides. The SUS PEMs demonstrate improved proton conductivity, long-term stability, fuel cell efficiency, and gas barrier properties. Notably, at the elevated temperature of 145 °C, attributable to enhanced water retention capabilities, these membranes exhibit significant proton conductivity, reaching 0.428 S cm−1. For fuel cell evaluations, the SUS PEMs exhibited optimal performance (0.940 W cm−2) at the elevated temperature of 115 °C. These improvements are attributed to the dense S layer, which regulates diffusion rates of both water and gas molecules, and the U layer, which serves as a water reservoir due to its high retention capacity. These conclusions have been validated through computational simulations and further supported by positron annihilation spectroscopy.
期刊介绍:
The Journal of Membrane Science is a publication that focuses on membrane systems and is aimed at academic and industrial chemists, chemical engineers, materials scientists, and membranologists. It publishes original research and reviews on various aspects of membrane transport, membrane formation/structure, fouling, module/process design, and processes/applications. The journal primarily focuses on the structure, function, and performance of non-biological membranes but also includes papers that relate to biological membranes. The Journal of Membrane Science publishes Full Text Papers, State-of-the-Art Reviews, Letters to the Editor, and Perspectives.