Nitrogen-Rich Rigid Polybenzimidazole With Phosphoric Acid Shows Promising Electrochemical Activity and Stability for High-Temperature Proton Exchange Membrane Fuel Cells,Advanced Functional Materials

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Nitrogen-Rich Rigid Polybenzimidazole With Phosphoric Acid Shows Promising Electrochemical Activity and Stability for High-Temperature Proton Exchange Membrane Fuel Cells
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-07-17 , DOI: 10.1002/adfm.202305948
Aolei Gao _{1,

2} , Wenwen Wang ₃ , Peng Wang _{1,

2} , Hongchao Wu ₃ , Chenliang Gong ₃ , Aogui Wu ₁ , Gongyi Wei ₁ , Lei Wang ₁

Affiliation

Polybenzimidazoles (PBIs) are the most promising binders for the catalyst layer (CL) in high-temperature proton exchange membrane fuel cells (HT-PEMFC). However, traditional commercial PBIs are not applied in binders because they do not enhance the electrochemical performance and because the related solvents are not environmentally friendly. In addition, proton transfer channels in PBIs are not investigated at the microscopic and atomic scales to date. In this study, a nitrogen-rich rigid PBI binder containing pyridine, diazofluorene, and partially grafted nitrile (PBPBI-3CN) is prepared with a functionalized structure, good thermal stability, and good solubility in an environmentally friendly solvent. A membrane electrode assembly (MEA) is fabricated with the PBPBI-3CN binder, providing a high peak power density, low resistance, and good stability. The protonation, hydrogen bond networks, and platform for proton transfer are confirmed in the CLs. The protonation of PBPBI-3CN occurs in two steps. First, some phosphoric acid (PA) molecules bind to nitrogen-containing acidophilic groups via preliminary protonation; second, multiple PA molecules then interact with nitrogen-containing acidophilic groups via further protonation. With protonation as the foundation, a sufficient amount of PA molecules form a hydrogen bond network, and proton transfer channels are established.

中文翻译：

富氮刚性聚苯并咪唑与磷酸在高温质子交换膜燃料电池中表现出良好的电化学活性和稳定性

聚苯并咪唑 (PBI) 是高温质子交换膜燃料电池 (HT-PEMFC) 催化剂层 (CL) 最有前途的粘合剂。然而，传统的商业PBI并未应用于粘合剂中，因为它们不能增强电化学性能，而且相关溶剂也不环保。此外，迄今为止，PBI 中的质子转移通道尚未在微观和原子尺度上进行研究。本研究制备了一种含有吡啶、重氮芴和部分接枝腈的富氮刚性PBI粘合剂（PBPBI-3CN），该粘合剂具有功能化结构、良好的热稳定性以及在环境友好溶剂中良好的溶解性。使用PBPBI-3CN粘合剂制备膜电极组件（MEA），具有高峰值功率密度、低电阻和良好的稳定性。质子化、氢键网络和质子转移平台在化学发光中得到了证实。PBPBI-3CN 的质子化分两步进行。首先，一些磷酸（PA）分子通过初步质子化与含氮亲酸基团结合；其次，多个 PA 分子通过进一步质子化与含氮亲酸基团相互作用。以质子化为基础，足够量的PA分子形成氢键网络，建立质子传递通道。

更新日期：2023-07-17

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