Constructing High-Performance Proton Transport Channels in High-Temperature Proton Exchange Membranes by Introducing Triazole Groups,ACS Applied Energy Materials

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Constructing High-Performance Proton Transport Channels in High-Temperature Proton Exchange Membranes by Introducing Triazole Groups
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2021-09-13 , DOI: 10.1021/acsaem.1c02173
Jianfa Liu ₁ , Shichao Wang ₁ , Lei Wang _{1,

2}

Affiliation

Recently, constructing proton transport channels has been considered an effective method to improve proton conductivity of high-temperature proton exchange membranes (PEM) with low phosphoric acid (PA)-doping levels. To construct proton transport channels, a metal–organic framework (MOF) is introduced into a polymer matrix. However, the MOF has poor compatibility with the polymer matrix as an inorganic substance. In this study, organic triazole-grafted poly(vinylbenzyl chloride) is synthesized and introduced into a cross-linked OPBI membrane to construct proton transport channels. Scanning electron microscopy (SEM) images show a homogeneous microstructure. Furthermore, proton transport channels are constructed in the membrane by introducing numerous triazole groups. The cross-linked OPBI has twice the proton conductivity of the linear OPBI, even with a low PA-doping level. All cross-linked membranes with a triazole group outperform OPBI membranes in terms of mechanical properties. The maximum power density of a single-cell test reaches 563 mW cm^–2 at 160 °C under H₂/O₂, and it can be maintained for 500 h under a constant load of current discharge without manifest voltage degradation. These impressive results indicate that the moderately cross-linked membrane with triazole groups is one of the potential materials for PEM applications.

中文翻译：

通过引入三唑基团在高温质子交换膜中构建高性能质子传输通道

最近，构建质子传输通道被认为是一种提高低磷酸 (PA) 掺杂水平的高温质子交换膜 (PEM) 质子传导性的有效方法。为了构建质子传输通道，将金属有机框架 (MOF) 引入聚合物基质中。然而，MOF作为无机物与聚合物基体的相容性较差。在这项研究中，合成了有机三唑接枝的聚（乙烯基苄基氯）并将其引入交联的 OPBI 膜中以构建质子传输通道。扫描电子显微镜 (SEM) 图像显示出均匀的微观结构。此外，通过引入许多三唑基团，在膜中构建了质子传输通道。交联的 OPBI 的质子传导率是线性 OPBI 的两倍，即使 PA 掺杂水平很低。所有具有三唑基团的交联膜在机械性能方面都优于 OPBI 膜。单节电池测试最大功率密度达到563 mW cm^–2在 H ₂ /O ₂下 160 °C，在恒流放电负载下可保持 500 小时而不会出现明显的电压降级。这些令人印象深刻的结果表明，具有三唑基团的适度交联膜是 PEM 应用的潜在材料之一。

更新日期：2021-09-27

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